in a solution prepared by dissolving 0.100 mole of propanoic acid in enough water to make 1.00 l of solution, the ph is observed to be 2.832. the ka for propanoic acid (hc3h5o2) is:
Answers
The answer is 1.3 x 10^-5 for the Ka of propanoic acid.
To solve this problem, we can use the relationship between the pH, the concentration of the acid, and the acid dissociation constant (Ka).
First, we need to find the concentration of propanoic acid in the solution. We know that 0.100 moles of propanoic acid are dissolved in 1.00 L of solution, so the concentration is:
concentration = 0.100 mol / 1.00 L = 0.100 M
Next, we can use the Ka value to set up an expression for the acid dissociation reaction:
HC3H5O2 + H2O ⇌ C3H5O2- + H3O+
The Ka expression for this reaction is:
Ka = [C3H5O2-][H3O+] / [HC3H5O2]
We can assume that the concentration of C3H5O2- is equal to the concentration of H3O+, since they are produced in a 1:1 ratio. Let's call this concentration x. Then the concentration of HC3H5O2 will be (0.100 - x), since some of the acid has dissociated.
Substituting these values into the Ka expression and solving for x gives:
Ka = x^2 / (0.100 - x) = 1.3 x 10^-5
x = 1.47 x 10^-3 M
Now we can use the definition of pH to find the pH of the solution:
pH = -log[H3O+] = -log(x) = -log(1.47 x 10^-3) = 2.832
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Related Questions
A 20-kg curling stone is sliding in a positive direction at 4 m/s. A second curling stone is sliding at the same speed but in the opposite direction. What is the net kinetic energy of the two stones. What is their net momentum?
Answers
The net kinetic energy of the two curling stones is 160 J, and their net momentum is 0 kg·m/s.
The kinetic energy of an object is given by the formula KE = 1/2mv^2, where m is the mass of the object and v is its velocity. Since the two curling stones have the same mass and speed, their individual kinetic energies are given by:
KE1 = 1/2(20 kg)(4 m/s)²= 160 J
KE2 = 1/2(20 kg)(4 m/s)² = 160 J
The net kinetic energy of the two stones is simply the sum of their individual kinetic energies, which is:
KE net = KE1 + KE2 = 160 J + 160 J = 320 J
The momentum of an object is given by the formula p = mv, where m is the mass of the object and v is its velocity. Since the two curling stones are moving in opposite directions with the same speed, their individual momenta are equal in magnitude but opposite in direction.
Therefore, their net momentum is zero:
p1 = (20 kg)(4 m/s) = 80 kg·m/s (in the positive direction)
p2 = -(20 kg)(4 m/s) = -80 kg·m/s (in the negative direction)
p net = p1 + p2 = 0 kg·m/s
As a result, the two stones' net kinetic energy is 320 J, and their net momentum is 0 kgm/s.
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ethane and ethene are both reacts with water and sulfuric acid as catalyst. what are the resulting products?
Answers
Ethanol is produced when ethane and ethene react with water and a catalyst like sulfuric acid. Adding concentrated sulfuric acid to hot ethanol (acts as a catalyst).
To eliminate carbon dioxide and sulphur dioxide that are created as byproducts, the gases are passed through a sodium hydroxide solution. The main product that is gathered over water is ethene. As a result, dehydration of ethanol produces ethene rather than ethane. The names Mattling acid and Oil of Vitriol are other names for sulfuric acid. It is highly caustic and acidic in nature. It dehydrates and oxidises when present in higher amounts. It is a clear, syrup-like liquid with no colour or smell. A substance having the chemical formula C 2H 6, ethane is an organic chemical.
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which electron is, on average, further from the nucleus: an electron in a 3p orbital or an electron in a 4p orbital?
Answers
An electron in a 4p orbital is, on average, further from the nucleus than an electron in a 3p orbital. This is because the 4p orbital is larger than the 3p orbital, and so the electron is more likely to be found further away from the nucleus on average.
It is generally accepted that, on average, an electron in a 3p orbital is further from the nucleus than an electron in a 4p orbital. This is due to the fact that the 3p orbitals are larger in size than the 4p orbitals. Additionally, the 3p orbital is closer to the 2p orbital than the 4p orbital, and thus the electron experiences less Coulombic attraction from the nucleus in the 3p orbital.
Hence the electron in a 3p orbital is, on average, further from the nucleus than the electron in a 4p orbital. This is because the 3p orbital is larger than the 4p orbital, and the electron is more likely to be found further away from the nucleus in a larger orbital.
Electrons are one of the three fundamental subatomic particles. Electrons are negatively charged, and are found in atoms. Electrons orbit the nucleus of an atom, and are responsible for the chemical properties of atoms. Electrons are also responsible for the electrical and magnetic properties of atoms and are responsible for electrical dipole present in it .
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As one object gets closer to another object , the force of gravity will increase ......
True or false
Answers
Answer:
true
Explanation:
hope that helped!!
What ions would the following elements form? Give the chemical symbol and the charge on the ion. [4]
a.Rubidium RbBr b. Bromine
b.Barium BaSO4 d. Sulfur
Answers
Answer:
N3-
Explanation:
Boiling point. The temperature at which water boils is called its boiling point and is linearly related to the altitude. Water boils at 2120 F at sea level and 193.60 at an altitude of 10,000 feet. (Source: biggreen.com) (5 pts.)
Find relationship of the form T=mx+b where T is the degrees Fahrenheit and x are the altitude in thousands of feet.
Answers
The boiling point of water is related to altitude in a linear manner. The relationship between temperature (T) in degrees Fahrenheit and altitude (x) in thousands of feet can be expressed as T = -1.84x + 212.
To find the relationship between temperature (T) in degrees Fahrenheit and altitude (x) in thousands of feet, we can use the equation T = mx + b, where m is the slope and b is the y-intercept.
Given that water boils at 212°F at sea level (x = 0) and 193.6°F at an altitude of 10,000 feet (x = 10), we can substitute these values into the equation.
At sea level (x = 0):
T = m(0) + b
T = b
Therefore, the y-intercept (b) is 212°F.
At an altitude of 10,000 feet (x = 10):
T = m(10) + b
193.6 = 10m + 212
10m = -18.4
m = -1.84
Thus, the slope (m) is -1.84.
The relationship of the form T = mx + b, relating temperature (T) in degrees Fahrenheit to altitude (x) in thousands of feet, is:
T = -1.84x + 212.
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A mixture of nitrogen, oxygen, fluorine, and neon are in a container which has a tiny, tiny pinhole leak. Which element leaks the slowest from the container?.
Answers
A mixture of nitrogen, oxygen, fluorine, and neon are in a container which has a tiny, tiny pinhole leak. The element leaks the slowest from the container is fluorine.
The effusion of gas is expressed as follows :
rate ∝ 1 / √M
rate of effusion is inversely proportional to the square root of molecular weight.
molecular weight of nitrogen = 14amu
molecular weight of oxygen = 16 amu
molecular weight of fluorine = 19 amu
the rate of effusion with increase of molecular weight. so the elements leaks the slowest from the container is fluorine.
Thus, A mixture of nitrogen, oxygen, fluorine, and neon are in a container which has a tiny, tiny pinhole leak. The element leaks the slowest from the container is
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Calculate the change in entropy from a process that increases the number of microstates by a factor of 84.0.
Report your answer in scientific notation. Your answer should have three significant figures. Use kB=1.38×10−23 J/K for the Boltzmann constant.
Answers
The change in entropy is approximately 5.84 × 10⁻²³ J/K.
What is Boltzmann constant?The Boltzmann constant (kB) is a fundamental physical constant that relates the average kinetic energy of particles in a system to the temperature of that system. It is denoted by the symbol "kB" and has a value of approximately 1.38 × 10⁻²³ J/K (joules per Kelvin). The Boltzmann constant is named after the physicist Ludwig Boltzmann.
To calculate the change in entropy (ΔS) from a process that increases the number of microstates by a factor of 84.0, we can use the formula:
ΔS = kB * ln(Nf/Ni),
where kB is the Boltzmann constant, Nf is the final number of microstates, and Ni is the initial number of microstates.
In this case, the factor by which the number of microstates increases is 84.0. Therefore, we have:
Nf/Ni = 84.0.
Plugging this into the formula, we get:
ΔS = kB * ln(84.0).
Using the given value for the Boltzmann constant, kB = 1.38 × 10⁻²³J/K, we can calculate the change in entropy:
ΔS = (1.38 × 10⁻²³ J/K) * ln(84.0).
Calculating this expression, we find:
ΔS ≈ 5.84 × 10⁻²³) J/K.
Therefore, the change in entropy is approximately 5.84 × 10⁻²³ J/K.
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if a 1.885 g cube has a height of 9.30 mm, width of 9.72 mm, and length of 23.70 mm, what is its density in g/ml? report your answer as a number (no units).
Answers
The density of the cube has a height of 9.30 mm is 0.892 g/ml.
What is density?The mass (m) per unit volume (V) of an object is its density.
ρ = m / V
We must first determine the cube's volume (V) using its dimensions in order to get its density:
V = length x width x height
V = 23.70 mm x 9.72 mm x 9.30 mm
V = 2113.18 mm^3
As the units of density are grams per milliliter, the next step is to convert the cube's mass from grams to milliliters:
[13:32, 2/28/2023] +91 95550 65997: 1 gram = 1 milliliter
Therefore, the volume of the cube in milliliters (V) is:
V = 1.885 g
Lastly, we can get the density of the cube using the density formula:
ρ = m / V = 1.885 g / 2113.18 mm^3
ρ = 0.000892 g/mm^3
Therefore, the density of the cube is approximately 0.000892 g/mm^3 or 0.892 g/ml.
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4- Which of the following is not a property of vinegar?
(a) Dissolve on water gives H*
(b) Has a slippery feel
(C) Turns litmus from blue to red
(d) React with zinc gives hydrogen gas.
Answers
Answer:
The correct answer is (b)
Explanation:
Has a slippery feel.Vinegar is an aqueous solution of acetic acid, and it has a number of properties that make it useful in a variety of applications. Some of these properties include:(a) Dissolves in water to give an aqueous solution of acetic acid (H*): Vinegar is composed of water and acetic acid, and it can be dissolved in water to form an aqueous solution.(c) Turns litmus from blue to red: Litmus is a type of dye that is used as an indicator in chemical reactions. It turns blue in the presence of an alkaline solution and red in the presence of an acidic solution. When vinegar is added to litmus, it will turn the litmus red, indicating that it is an acidic solution.(d) Reacts with zinc to give hydrogen gas: When vinegar is mixed with zinc, it can produce hydrogen gas. This reaction is an example of a redox reaction, in which the vinegar is reduced (gains electrons) and the zinc is oxidized (loses electrons).However, vinegar does not have a slippery feel, so (b) Has a slippery feel is not a property of vinegar.
Put the rules in order, first rule up top.
FIRST RULE
= Balance Oxygen
= Write down the elements
= Balance Hydrogen
= Balance non-metals
Balance metals
Answers
Answer:
Write down the elementsBalance MetalsBalance Non- metalsBalance OxygenBalance Hydrogen.
What evidence is there in your experiment that the water collected in the receiving flask was salt free?
Answers
There are numerous methods for determining if the water collected in the receiving flask during the experiment is salt-free or not like taste test, conductivity test and chemical analysis.
To establish this, the experimenter may utilise one or a combination of the approaches listed below:
Taste Test: Tasting the water is the simplest way to check if it is salt-free. If there is no discernible salt flavour in the water, it is most likely salt-free.Conductivity Test: The electrical conductivity of water is increased by the presence of salts in it. The experimenter can detect if the water is salt-free by measuring the electrical conductivity of the water in the receiving flask.Chemical Analysis: The experimenter may choose to do a chemical analysis on the water to identify the presence of salts. This can be accomplished using techniques such as ion chromatography or atomic absorption spectroscopy.For more such questions experiment.
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is a known amount of compound different from the analyte that is added to the unknown
Answers
A known amount of compound refers to a predetermined quantity of a substance, while the analyte added to an unknown sample is a substance being tested for identification or measurement.
A known amount of compound signifies a specific and predetermined quantity of a substance. It is often used as a reference or control in experiments, allowing for comparisons and accurate measurements. This known compound is typically added to a sample with an unknown composition or concentration. In contrast, the analyte added to the unknown is the substance of interest being tested for identification or measurement.
The purpose of adding the analyte is to assess its presence, concentration, or any other desired characteristic. The comparison between the known compound and the analyte helps in determining and understanding the properties and composition of the unknown sample.
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What is the difference between a magma formed by fractional crystallization and one formed by ordinary cooling?
Answers
The difference between a magma formed by fractional crystallization and one formed by ordinary cooling is that the magma becomes progressively enriched in silica.
What is fractional crystallization of magma?Processes that separate crystals from liquid are referred to as fractional crystallization. The liquid that is left over in this situation is regarded as a fresh magma. The crystals can be removed from a magma by a number of methods. The liquid that many minerals crystallise from is denser than the mineral itself.Fractional crystallisation, in its simplest form, is the removal of newly created crystals from an initially homogenous magma (for instance, via gravity settling) in order to stop these crystals from reacting further with the remaining melt.All igneous rocks are created from magma, which is a naturally occurring substance that is molten or semi-molten. The Earth possesses magma beneath its surface, and other terrestrial planets and several naturally occurring satellites have also been confirmed to have magmatic activity.Learn more about fractional crystallization of magma refer to :
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An NaCl solution is prepared by dissolving 50.0 g NaCl in 200.0 g ofwater at 25"C What is the vapor pressure of the solution if the vapor pressure of water at 25*C is 23.56 torr? 1.574 tonr 1.686 tOrr 20.41 torr 0.8744 torr 21.87 torr
Answers
The vapor pressure of the NaCl solution is approximately 21.87 torr.
To calculate the vapor pressure of the NaCl solution, we can use Raoult's law which states that the vapor pressure of the solvent above the solution is proportional to the mole fraction of the solvent in the solution.
The mole fraction of water in the solution can be calculated as:
X_water = moles of water / total moles
The moles of water can be calculated from the mass of water and its molar mass, and the moles of NaCl can be calculated from its mass and molar mass:
moles of water = mass of water / molar mass of water = 200.0 g / 18.015 g/mol = 11.098 mol
moles of NaCl = mass of NaCl / molar mass of NaCl = 50.0 g / 58.44 g/mol = 0.855 mol
The total moles of solute and solvent in the solution is the sum of the moles of NaCl and water:
total moles = moles of NaCl + moles of water = 0.855 mol + 11.098 mol = 11.953 mol
The mole fraction of water is then:
X_water = moles of water / total moles = 11.098 mol / 11.953 mol = 0.9292
The vapor pressure of the solution can be calculated using Raoult's law:
P_solution = X_water * P_water
where P_water is the vapor pressure of pure water at the given temperature. Substituting the given values, we get:
P_solution = 0.9292 * 23.56 torr = 21.87 torr
Therefore, the vapor pressure of the NaCl solution is approximately 21.87 torr.
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each atom of an element has the following electron configuration.
1s22s22p63s23p64s23d104p65s24d105p5
what is the name of this element
Answers
Answer:
12 angle
Explanation:
determine the standard enthalpy change for the decomposition of hydrogen peroxide per mole of hydrogen peroxide.
Answers
The standard enthalpy change for the decomposition of hydrogen peroxide per mole of hydrogen peroxide is -98.2 kJ/mol.
when 1 mole of hydrogen peroxide (H2O2) ( H 2 O 2 ) undergoes decomposition, the heat evolved (ΔH) is −98.2kJ. − 98.2 k J . The molar mass of H2O2 H 2 O 2 is 34.015 g/mol. This means that the mass of 1 mole of H2O2 H 2 O 2 is 34.015 g.
This value is obtained from the standard enthalpy of formation of the products (H2 and O2) and the standard enthalpy of formation of the reactant (H2O2). Enthalpy of formation is the energy change that occurs when a compound is formed from its elements, in their standard states.
The difference between the enthalpies of formation of the products and the reactant is the enthalpy change for the reaction. In this case, the enthalpy change for the decomposition of hydrogen peroxide is -98.2 kJ/mol. This indicates that the decomposition of hydrogen peroxide is an exothermic reaction and it releases 98.2 kJ/mole of energy.
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Please can someone explain the differences in variables (e.g. control variable, Independent variable and Dependent variable). I know the definition, but I'm still not sure which is which when undertaking an experiment. Could someone possibly give me an example of an experiment and which is which?
Answers
Answer:
Independent Variable: The thing in an experiment which is changed.
Dependent Variable: The thing in an experiment which is affected by the change. (In other words, it's affected by the independent variable.)
Control Variable: The other factors of the experiment that remain unchanged.
For example, say you want to do an experiment about the effects of water on plant height. So, the independent variable, or the thing that is changed would be the amount of water, and the dependent variable would be the plant height, as the plant height is directly affected by the independent variable. Lastly, for this to be a fair experiment, there must be control variables. For example, all of the plants should be put in a room with equal temperature, they should get the same amount of sunlight, etc.
I hope this answers your question- feel free to ask me if you need any more help.
Answer with Explanation:
Lol.. even i was confused before .. so i learnt now ill help u :
Simple!
See... lets take simple expirament to explain:
My expirament is to verify if sunlight affects the growth of plants ...
So here :
My controlled variable : It is what is held constant.. So ur supposed to NOT it like everything else expect sunlight..(ex: water, soil, type of plant etc)
My Independent variable : Variable that is changed.... So this is wht u ARE changing to make th expirament ... (for ex: here sunlight u will chanhe... u will put on in a dark room and a nother in the light..)
My dependetn variabe:l Some thing that changes on is own..cause of the expiramen t... like the result ..(for ex: height , growth of plant etc)
I hope u understood !! :))
The __ increases by 1 as you go left to right across the periodic table.
A. Atomic mass
B. Atomic number
C. Number of neutrons
D. Number of ions
Answers
The __ increases by 1 as you go left to right across the periodic table.
A. Atomic mass
B. Atomic number
C. Number of neutrons
D. Number of ions
Answer C
Which element has the highest electronegativity?
Answers
Answer:
fluorine
Explanation:
Answer:
The element with the highest electronegativity is fluorine with a score of 4.0 (which is the highest possible)
Explanation:
I personally haven't gotten this question yet so I hope this helps you!
The decomposition of dinitrogen pentoxide, N2O5, to NO2 and O2 is a first-order reaction. at 60°C, the rate constant is 2.8 × 10^-3min^-1. If a rigid vessel initially contains only N2O5 at a pressure of 125 kpa. How long will it take for the total pressure to reach 146 kpa?
Answers
For the total pressure to reach 146 kpa it will take 42 Minutes.
The decomposition of dinitrogen pentoxide (N2O5) to nitrogen dioxide (NO2) and oxygen gas (O2) can be represented by the following Chemical equation:
N2O5 → 2NO2 + 1/2O2
Po - x 2x x/2
This is a first-order reaction, which means that the rate of the reaction is Proportional to the concentration of N2O5:
Rate = k[N2O5]
Where k is the rate constant. At 60°C, the rate constant is given as 2.8 × 10^-3 min^-1.
t=0
Po=125
Po - x + 2x + x/2 = 146
3x/2 = 146 - 125 = 21 , x = 14
Using integrated rate law
t = 1/k ln Po/Po-x
= 1/2.8 x 10-3 ln (125/125-14)
t = 42 minutes.
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39. Choose the molecule with the strongest bond.
A) F2 B) Cl2 C) Br2
D) I2
Answers
The molecule with the strongest bond is I2. This is because the bond strength increases down the group in halogens.
As we move down the group, the size of the halogen atoms increases, leading to a greater distance between the two atoms in the diatomic molecule. However, the number of electron shells also increases, which increases the number of electrons in the bond, making it stronger.
The increase in size is not the only factor that affects the strength of the bond. As the size of the atoms increases, the number of electrons in the bond also increases. This is because each atom in the bond contributes one electron to the shared pair of electrons, and as the size of the atoms increases, the number of electrons also increases.
Therefore, I2 has the strongest bond among the given options as it has the largest size and the most number of electrons in the bond.
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in what molecules does the presence of nonbinding electron pairs produce an effect on molecular shape
Answers
The presence of nonbonding electron pairs, also known as lone pairs or nonbonding electron domains, can have an effect on the shape of molecules. These lone pairs influence the molecular geometry by exerting electron repulsion and affecting the arrangement of atoms and bonding pairs.
Molecules that commonly exhibit the influence of nonbonding electron pairs on molecular shape include:
Water (H2O): In water, the two lone pairs of electrons on the oxygen atom affect the molecular shape, leading to a bent or V-shaped geometry.
Ammonia (NH3): Ammonia has one lone pair of electrons on the nitrogen atom, which leads to a pyramidal shape.
Nitrogen trifluoride (NF3): NF3 has one lone pair of electrons on the central nitrogen atom, resulting in a trigonal pyramidal shape.
Carbon dioxide (CO2): Although carbon dioxide does not possess any lone pairs on the carbon atom, the presence of two double bonds results in a linear molecular shape.
Sulfur hexafluoride (SF6): The six lone pairs of electrons on the sulfur atom in SF6 cause electronic repulsion, resulting in an octahedral shape.
These are just a few examples, but there are many molecules where nonbonding electron pairs influence the overall molecular shape. The presence and arrangement of these lone pairs affect the bond angles and distortions from ideal geometries in molecules, ultimately determining their three-dimensional shapes.
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What ratio of NaCN to HCN is needed to prepare a pH 9.40 buffer? (Ka of HCN is 4.9 × 10⁻¹⁰)
Answers
Answer: The ratio of NaCN to HCN is, 1.26
2(3a-3)-2(a-2)=3
thank you
Answers
Answer:
6a - 6 - 2a + 4 = 3
4a - 2 = 3
4a = 3 + 2
4a = 5
a = 5/4
hope that helps ✌
which arrow represents water forming outside a cold water bottle left outside
Answers
Answer:
The phase transition that represent the the cooling of gaseous water to form liquid outside a bottle left outside which is a process known as is represented by the arrow 2
Explanation:
The different phase transitions that occur in mater are;
1) A phase transition from the solid phase to the liquid phase which occur by heating, represented by the arrow 2 and the process is known as melting
2) A phase transition from the liquid phase to the gaseous phase which occur by further heating the liquid, represented by the arrow 1 and the process is known as evaporation
3) A phase transition from the gaseous phase to the liquid phase which occur by cooling the hot gas, represented by the arrow 2 and is known as condensation
4) A phase transition from the liquid phase to the solid phase which occur by further cooling the liquid, represented by the arrow 5 and the process is known as freezing
5) A phase transition from the solid phase to the gaseous phase which occur by heating the cold solid, represented by the arrow 3 and the process is known as sublimation
6) A phase transition from the gaseous phase to the solid phase which occur by cooling the gas, represented by the arrow 6
Therefore, the phase transition that represent the the cooling of gaseous water to form liquid outside a bottle left outside is represented by the arrow 2
Which statement accurately describes the reactants of a reaction?
substances that do not participate in a reaction
new substances formed in the reaction
new substances that are present at the end of a reaction
substances that are used up in a reaction
Answers
Answer:
Substances that are used up in a reaction.
Explanation:
E.g In the Scientific equation Sodium +Chlorine=Sodium Chloride, Sodium and Chlorine are the reactants and the product is Sodium Chloride.
Hope this helps
Pl help it’s for a grade and I can’t find it
Answers
Answer:
personally I think it's a but it could also be D.
But yeah personally I would say A
Look at the image below and answer the following questions:
What kind of circuit has been built?
What will happen if one of the light bulbs is burnt out and no longer lights up?
Answers
Answer: series circuit
Explanation:
when one bulb burns out the other bulb will go off because the circuit breaks
Consider the oxidation and reduction reaction below. Identify which substance is being oxidized and which is being reduced. How do you know? Cl2(g) + 2HBr(g) 2HCl(g) + Br2(g)
Answers
Consider the oxidation and reduction reaction below. The substance which is being oxidized and which is being reduced are HBr and Cl₂ respectively.
What is Oxidation?This is defined as a process in which an electron is removed from a molecule during a chemical reaction.
In the equation given: Cl₂(g) + 2HBr(g) 2HCl(g) + Br₂(g).The Cl₂ is reduced from oxidation state 0 to -1 while HBr oxidized from -1 to 0 thios therefore means that Chlorine is oxidizing agent while HBr is reducing agent and is therefore the correct choice.
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