What is the pH of a solution that is 0.040 M formic acid and 0.0032 M formate (the conjugate base)? Ka of formic acid = 1.77 x 10-4
2. Which of the following would have the highest buffer capacity?
Group of answer choices
1.500 M NH4+ / 1.500 M NH3
0.25 M HCO3- / 0.25 M CO32-
0.35 M HCOOH / 0.35M HCOO-
0.40 M HF / 0.40 M F-
1.0 M HCN / 1.0 M CN-
3. What will be the final pH when 5.865 mL of 3.412 M NaOH is added to 0.5000 L of 2.335 x 10-2 M HCl?
4. 0.450 L of 0.0500 M HCl is titrated to the equivalence point with 8.73 mL of a NaOH solution. What is the concentration (in M) of the NaOH solution that was added?
Answers
The pH of a solution that is 0.040 M formic acid and 0.0032 M formate (the conjugate base) is 3.81.Formula to calculate the pH of the given solution is given as:$$pH = pK_a + log\left(\frac{[Conjugate\:base]}{[Acid]}\right)$$Let's solve the given problem.
Given:Acid = Formic acid (HCOOH) = 0.040 M Conjugate base = Formate ion (HCOO-) = 0.0032 M$$K_a = 1.77 \times 10^{-4}$$$$K_a = \frac{[H^+][HCOO^-]}{[HCOOH]}$$$$[H^+] = \sqrt{K_a\left(\frac{[HCOOH]}{[HCOO^-]}\right)}$$$$[H^+] = \sqrt{1.77 \times 10^{-4} \times \frac{0.040}{0.0032}}$$$$[H^+] = 0.019 M$$$$pH = -log[H^+]$$$$pH = -log[0.019]$$$$pH = 1.72$$So, the pH of a solution that is 0.040 M formic acid and 0.0032 M formate (the conjugate base) is 3.81.2. The buffer capacity depends on the concentration of the buffer components. The greater the concentrations of acid and base, the greater the buffer capacity. Therefore, the solution with 0.5 M NH4+ and 0.5 M NH3 would have the highest buffer capacity.3. The final pH when 5.865 mL of 3.412 M NaOH is added to 0.5000 L of 2.335 x 10-2 M HCl can be calculated as follows:Given:Initial volume of HCl solution = 0.5000 LInitial concentration of HCl = 2.335 x 10^-2 MInitial moles of HCl = 0.5000 L × 2.335 x 10^-2 M = 1.1675 x 10^-2 molMoles of NaOH added = 5.865 mL × 3.412 M = 0.01999338 mol[HCl] = (1.1675 x 10^-2 mol) / (0.5000 L) = 0.02335 MNaOH is a strong base, which means that it will react completely with HCl to form NaCl and water.
Therefore, the moles of HCl initially present in the solution will be equal to the moles of NaOH added:pH = -log[H+]$$NaOH + HCl \to NaCl + H_2O$$$$\text{Moles of HCl remaining} = \text{Initial moles of HCl} - \text{Moles of NaOH added}$$$$\text{Moles of HCl remaining} = 1.1675 \times 10^{-2} - 1.9993 \times 10^{-2}$$$$\text{Moles of HCl remaining} = -0.0083$$Since we have added more moles of base than the initial moles of acid, we can assume that all the acid has been consumed and that the solution is now basic.The number of moles of NaOH remaining in solution can be calculated by taking into account that only 5.865 mL of NaOH solution has been added, which is less than the initial volume of HCl solution. Therefore, some HCl remains in solution and some NaOH remains unreacted. The amount of unreacted NaOH can be calculated as follows:Volume of NaOH solution remaining = Volume of NaOH solution initially added - Volume of HCl solution reacted = 5.865 mL - 0.5 L = -0.494135 mL = -4.94135 x 10^-4 LTherefore, the concentration of NaOH in the final solution is:[NaOH] = (0.01999338 mol) / (0.5 L + (-4.94135 x 10^-4 L)) = 0.040166 MNow, we can calculate the final pH:pOH = -log[OH-] = -log(0.040166) = 1.3965pH = 14.00 - pOH = 14.00 - 1.3965 = 12.6035 ≈ 12.604.
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Related Questions
what is the correct terms for atom with a full valence shell?
Answers
Answer:
octet rule
Explanation:
What is the density of hydrogen sulfide (H2S) at 0.7 atm and 322 K?
Answers
Answer:
0.9g/L.
Explanation:
To calculate the density of hydrogen sulfide (H2S) at 0.7 atm and 322 K, we can use the ideal gas law:
PV = nRT
where P is the pressure in atmospheres (atm), V is the volume in liters (L), n is the number of moles of gas, R is the universal gas constant (0.08206 L·atm/(mol·K)), and T is the temperature in Kelvin (K).
We can rearrange this equation to solve for the number of moles of gas:
n = PV / RT
Next, we can use the molar mass of H2S (34.08 g/mol) to convert the number of moles to mass:
mass = n × molar mass
Finally, we can divide the mass by the volume to obtain the density:
density = mass/volume
Let's assume a volume of 1 L (since the volume is not given in the question). Then we have:
P = 0.7 atm
T = 322 K
R = 0.08206 L·atm/(mol·K)
molar mass of H2S = 34.08 g/mol
First, we calculate the number of moles of H2S using the ideal gas law:
n = PV / RT
n = (0.7 atm) (1 L) / (0.08206 L·atm/(mol·K) × 322 K)
n = 0.0265 mol
Next, we calculate the mass of H2S using the number of moles and the molar mass:
mass = n × molar mass
mass = 0.0265 mol × 34.08 g/mol
mass = 0.9 g
Finally, we calculate the density of H2S:
density = mass/volume
density = 0.9g/1 L
density = 0.9 g/L
Therefore, the density of hydrogen sulfide (H2S) at 0.7 atm and 322 K is approximately 0.9g/L.
How many mL of a 4.0M NaBr solution are needed to make 200.0 mL of 0.50 M NaBr?
A)150mL
B)25mL
C)100mL
D)50mL
Answers
Where are elements located based on their mass?
Answers
Answer:
they are located on the abbism
hint: write a balanced chemical equation that illustrates the standard enthalpy of formation of n2o5. the standard molar internal energy of formation of n2o5(g) is 17.433 kj/mol at 298 k. what is the standard molar enthalpy of formation of n2o5(g) at the same temperature?
Answers
The standard molar enthalpy of the formation of N2O5(g) at 298 K is 19.913 kJ/mol.
To write a balanced chemical equation for the standard enthalpy of formation of N₂O₅, we start with the elements nitrogen and oxygen in their standard states:
N₂(g) + 5/2 O₂(g) → N₂O₅(g)
This equation shows that one mole of N₂ reacts with 2.5 moles of O₂ to form one mole of N₂O₅.
The standard enthalpy of formation, ΔHf°, is defined as the enthalpy change for the formation of one mole of a compound from its constituent elements in their standard states, all at 1 atm pressure and a specified temperature (usually 298 K). The enthalpy change can be calculated from the standard molar internal energy of formation, ΔUf°, using the equation:
ΔHf° = ΔUf° + RT
where R is the gas constant and T is the temperature in Kelvin.
Substituting the given values, we get:
ΔHf° = 17.433 kJ/mol + (8.314 J/mol*K)(298 K) / 1000 J/kJ
ΔHf° = 17.433 kJ/mol + 2.480 kJ/mol
ΔHf° = 19.913 kJ/mol
Therefore, the standard molar enthalpy of the formation of N₂O₅(g) at 298 K is 19.913 kJ/mol.
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How many protons, neutrons, and electrons are there?
Answers
Answer:
proton-27
electron-25
neutron-35
Explanation:
What do the nitrogen-fixing bacteria in
the soil/roots of plants convert the
nitrogen gas to? Select all that apply.
Nitrite
Ammonia
Ammonium
Nitrate
Answers
Nitrate compounds is the answer
what is the alkalinity of this water sample? b) how much acid is required to reduce the ph of the sample to 6 assuming no exchange of co2(g) with the atmosphere (i.e., the system stays closed)? c) what would be the ph of the sample if it came to equilibrium with the atmosphere (pco2
Answers
A sample of water is taken, and the amount of acid required to bring it to a pH of 4.2 is then calculated to determine the total alkalinity.
How can the alkalinity of a water sample be determined?By titrating the water sample with sulfuric acid that has known pH, volume, and concentration values, it is possible to estimate the alkalinity of water. The amount of sulfuric acid required to reach the end point and the reaction's stoichiometry are used to calculate the concentration of alkalinity in water.
What do pH and alkalinity mean?The concentration of acid protons [H+] is what is commonly referred to as ph. The alkalinity of a solution, on the other hand, determines how well it can neutralize acids. Ions that are alkaline incorporate acid protons into their molecules so that they are not available as a free acid that can cause the pH to decrease.
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Which of the following is true for a nuclear reaction?
O Electrons are lost
Electrons are gained
O Identity of element changes
Oldentity of element remains same
Answers
True statement for a nuclear reactions is that it changes the identity of the element.
What are nuclear reactions?Nuclear reactions are those reactions in which changes in the nucleus of atoms take place in the form of fission and fussion.
As it is said that changes are taking place in nucleus so the electrons are not gained or lost in this reactions.Identity of the element changes as atomic number of element changes due to change in the number of protons.Hence identity of element changes.
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2. When you use a soap or detergent to wash, the surfactant molecules will interact with the dirt and oils to help wash them away. During this interaction something called a micelle is formed. (For mo
Answers
When you use a soap or detergent to wash, the surfactant molecules will interact with the dirt and oils to help wash them away. During this interaction, something called a micelle is formed.
A micelle is a cluster of surfactant molecules that are formed when soap or detergent molecules are mixed with water. When soap or detergent is added to water, the hydrophobic tails of the molecules (which do not mix with water) cluster together, while the hydrophilic heads (which are attracted to water) point outwards towards the water.
Micelles are formed by the hydrophobic tails of the surfactant molecules clustering together in the center, with the hydrophilic heads facing outward.
The soap or detergent's molecules' hydrophobic tails attract oils and dirt, while the hydrophilic heads attract water molecules. The hydrophobic tails of the detergent molecules encircle the dirt and oil particles, while the hydrophilic heads point outward toward the water, creating a micelle.
The micelles disperse the dirt and oil particles throughout the water so that they can be washed away.
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How to calculate the number of moles
Answers
Answer:
1. The formula for the number of moles formula is expressed as.
2. Given.
3. Number of moles formula is.
4. Number of moles = Mass of substance / Mass of one mole.
5. Number of moles = 95 / 86.94.
Which of the following is considered a macronutrient?
a. Lipids
b. Vitamins
c. Minerals
d. All of the above
Answers
Of the options given, lipids are considered a macronutrient.
Macronutrients are nutrients that the body requires in large amounts to function properly and maintain health. The three primary macronutrients are carbohydrates, proteins, and fats (lipids). Lipids are a type of nutrient that includes fats, oils, and cholesterol, and they are essential for the body's energy production, insulation, and the formation of cell membranes.
Vitamins and minerals, on the other hand, are considered micronutrients, which are nutrients that the body requires in smaller amounts but are still essential for proper health and functioning. Vitamins are organic compounds that help regulate various bodily functions, while minerals are inorganic substances that are necessary for proper cellular function, enzyme activity, and other bodily processes.
Therefore, option (a) lipids is the correct answer, as it is the only macronutrient among the given options.
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How does the temperature change when a layer of glass is added?
Answers
Answer:
thermal shock
Explanation:
the temperatures inside the glass jar should have continued to increase over time. Internal stresses due to uneven heating. This is also known as “thermal shock”.
In general, the thicker the glass, the more prone it will be to breaking due to the immediate differences in temperature across the thickness of glass.
Borosilicate glass is more tolerant of this, as it has a higher elasticity than standard silicon glass.
You may also note that laboratory test tubes and flasks are made with thinner walls, and of borosilicate glass, when designated for heating.
A scuba tank has a pressure of 195 KPa at a temperature of 10 °C. The volume of the tank is 350 L. How many grams of air is in the tank? (MM air =29g/mol)
Answers
The mass of air in the scuba tank is 841.614 g.
Using the ideal gas equation;
PV=nRT
P = pressure of the gas = 195 kPa
V = volume of the gas = 350 L
n = Number of moles of the gas = ??
R = molar gas constant = R = 8.314 J K-1 mol-1
T = temperature of the gas = 10 °C or 283 K
n = PV/RT
n = 195 * 350/8.314 * 283
n = 68250/2352.862
n = 29.00 moles
Number of moles = mass/molar mass
mass of air = Number of moles * molar mass
mass of air = 29.00 moles * 29g/mol
Mass of air = 841.614 g
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Assuming only single bonds are used…
1. what shape does a central atom from group 4a (14) have?
2. what shape does a central atom from group 5a (15) have?
3. what shape does a central atom from group 6a (16) have?
Answers
1) Assuming that only single bonds are formed by group 4A(14) elements, the shape of a central atom of group 14 is tetrahedral.
The general electronic configuration of group 14 elements is ns²np² and it is shown in box diagram in the attached image. When one electron is excited, it goes in vacant p-orbital and the p and s-orbital is half filled. It is shown in attached image.
When the another atoms are filled in the half-fiiled orbital, it forms sp³ hybridisation and its shape is tetrahedral.
Therefore, the shape of central atom of group 14 is tetrahedral.
2) Assuming that only single bonds are formed by group 4A(14) elements, the shape of a central atom of group 15 is pyramidal.
The general electronic configuration of group 15 element is ns²np³ and its box diagram is already shown in the image. When atoms are filled, it goes in p-orbital and pair of electron acts as a lone pair. Due to this lone pair, lone pair-bond pair repulsion is occurred and the geometry of the central atom is pyramidal.
Therefore, the shape of central atom of group 15 is pyramidal.
3) Assuming that only single bonds are formed by group 4A(14) elements, the shape of a central atom of group 16 is bent.
The general electronic configuration of group 16 is ns²np⁴ and its box diagram is shown in the attached image. There are two electron pairs which acts as a lone pair and another two orbitals are filled by another atom. When they are filled, it shows lone pair-lone pair, lone pair-bond pair and bond pair-bond pair repulsion. Therefore, they are come closer to each other and forms bent shape.
Therefore, the shape of the central atom of group 16 is bent shape.
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an object is moving to the right at a constant veloxity. what will happen if a force of 20 N starts acting on it in the opposite direction
Answers
Answer:
Explanation:
The objects velocity will decrease because the force is opposing its motion
Help me answer these questions! (Picture provided!)
Answers
Answer:
1-a
Explanation:
science to understand while tech. make the work easier
3.
Which of the following is not true for atoms? (4 points)
They combine to form elements and molecules.
They contain negatively charged electrons.
They are the building blocks of matter.
They are made up of elements.
Answers
Answer:
They are made up of elements.
Explanation:
An atom is the smallest particle of matter that still retains the property of the element.
Two or more atoms combine to form elements or compounds. Elements are formed by two or more similar atoms, while compounds are formed by two or more different elements.
Atoms are made up of subatomic particles, protons, electrons and neutrons. Electrons are negatively charged, protons are positively charged while neutrons have no charge.
I hope this help! :)
How many liters of wine can be held in a wine barrel whose capacity is 30.0 gal? You had been given a new penny to test if it is made up of pure copper or not. You measured the mass of the penny which was 2.49 g. You then find that the penny displaces 0.349 cm3 of water. Is the penny made of pure copper? (Density of pure copper = 8.96 g/cm3)
Answers
The first step in this calculation is to know how many liters is equal to 1 gallon, and the value is 3.785 liters, so now we have to make the following calculation:
1 gal = 3.785 Liters
30.0 gal = x Liters
x = 3.785 * 30.0
x = 114 Liters
Acetylene gas (ethyne; HC = CH) burns in an oxyacetylene torch to produce carbon dioxide and water vapor. The heat of reaction for the combustion of acetylene is 1259 kJ/mol.
(c) How many grams ofCO₂ form?
Answers
The mass of CO2 produced by 26g of acetylene is 88g.
Given ,
In an oxyacetylene torch, acetylene gas (ethyne; HCCH) burns to produce carbon dioxide and water vapour.
The acetylene combustion reaction is given by,
H2O + HCCH + 5/2 O=O 2CO2
Heat of reaction for acetylene combustion = 1259kj/mol
CO2 has a molecular mass of 44g/mol.
2 moles of CO2 have a molecular mass of 88g.
On combustion, 1 mole of acetylene yields 2 moles of CO2.
Thus, 26g of acetylene produces 88g of CO2 when burned.
As a result, the mass of carbon dioxide produced by 26g of acetylene is 88g.
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give me an atom with boron characteristics
Answers
Elements of boron are not found in nature. It is mixed with borates, kernite, ulexite, colemanite, borax, and boric acid. Boric acids are occasionally present in vulcanic spring fluids.
boron into the air, soil, and water during weathering, boron occurs naturally in the environment. In very small quantities, it may also be present in groundwater.
Through the production of glass, the burning of coal, the melting of copper, and the use of agricultural fertilizers, humans add boron to the environment. Human-added boron concentrations are lower than boron concentrations that occur naturally as a result of weathering.
Although it is unlikely that someone may be exposed to borate dust at work, it is possible to be exposed to borate through the air and drinking water. Consumer goods like laundry detergent and cosmetics might expose you to boron.
Thus Elements of boron are not found in nature. It is mixed with borates, kernite, ulexite, colemanite, borax, and boric acid. Boric acids are occasionally present in vulcanic spring fluids.
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A 2.00 mL sample of a substance A has a density of 18.4 g/mL and a 5.00 mL sample of
substance B has a density of 35.5 g/mL. Do you have an equal mass of substances A and
B? Explain your answer.
Answers
Answer: No, the samples are not of equal masses.
Explanation: Mass is volume X density
A: (2ml)*(18.4g/ml) = 36.8 g
B: (5ml(*(35.5g/ml) = 177.5 g
ASAP HELP, PLEASE HELP ASAP
Which statement accurately compares kinetic and Potential energy?
Question 5 options:
Gravity affect the amount of both kinetic and potential energy
Both kinetic and potential energy are a result of an unbalanced force acting on the object
Potential energy and kinetic energy both gain energy from standing still
Kinetic and Potential energy affect an object the same
Answers
Answer: gravity affect the amount of both kinetic and potential energy
Explanation:
please help me with the second image questions it is really important and I really need it please help me out and provide me the answers for the second image two questions, looking at the first image please.
Answers
Answer:
is this exam.. are you coping..
The ph scale ranges from ____________ at its lowest to ____________ at its highest and measures the alkalinity of a solution.
Answers
Answer:
The pH scale ranges from 0-14.
Explanation:
Zero is the most acidic measurement while six would be the least acidic of the acids, seven is a pure substance, neither acidic nor basic, eight is the least basic measurement while 14 is the most basic of the bases.
1. Does warm air rise or sink? Does cold air rise or sink? 2. Air pressure can be high or low. Does air flow from low to high pressure or from high to low pressure? 3. Which is heavier—warm air or cold air? 4. Which has higher air pressure—warm air or cold air? How do you know? 5. Global circulation cells occur because of uneven heat distribution and the earth's rotation. What do we call the effect of the earth's rotation on air circulation?
Answers
Answer:
1. Warm air rises and cold air sinks.
2. Air moves from high to low pressure.
3. Cold air is denser than warm air.
4. Warm air is lighter than cold air and consequently exerts less pressure.
5. Because the Earth rotates on its axis, circulating air is deflected toward the right in the Northern Hemisphere and toward the left in the Southern Hemisphere. This deflection is called the Coriolis effect.
Which phase of the Moon is occurring when no moon can be seen in the night sky?
A.
gibbous moon
B.
new moon
C.
crescent moon
D.
full moon
Answers
Answer: your anwer is B. New moon
Hope this helped!
Answer:
C.
Explanation:
hope this helps!
thank u
~sharms uwu /
what type of bond is made between amino acids in the ribosome?
Answers
Answer:
Peptide bonds form between the amino group of the amino acid attached to the A-site tRNA and the carboxyl group of the amino acid attached to the P-site tRNA. The formation of each peptide bond is catalyzed by peptidyl transferase, an RNA-based enzyme that is integrated into the 50S ribosomal subunit.
Choose the molecule or compound that exhibits dipole dipole forces as its strongest intermolecular force? SO2 Cl4 BCl3 Br2 H2O
Answers
The molecule or compound that exhibits dipole-dipole forces as its strongest intermolecular force is SO₂.
the correct option is A.
What are intermolecular forces?Intermolecular forces are forces that exist between molecules of the same compound and which are responsible for several physical properties of substances such as boiling and melting points.
Some of the intermolecular forces that exist between molecules of compounds include:
London dispersion forcesDipole-dipole forcesHydrogen bondingIon-dipole forcesThe strongest intermolecular force is the ion-dipole force.
Considering the intermolecular forces present in the given compounds:
SO₂ - has London dispersion forces and dipole-dipole forces
Cl₄ - has London dispersion forces
BCl₃ - has London dispersion forces
Br₂ - - has London dispersion forces
H₂O - - has London dispersion forces, dipole-dipole forces, and hydrogen bonding
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-) Potassium is also in Group 1 of the periodic table. Potassium reacts with water in a similar
way to lithium. Write down two differences you would see between the reactions of
potassium and lithium with water.
Answers
Lithium react slowly with water while potassium react violently with water. potassium caught fire while lithium does not caught fire.
What is chemical reaction?Chemical reaction is defined as a procedure in which one or more compounds, known as reactants, are changed into one or more distinct substances, known as products.
It can also be defined as a process in which two or more molecules collide with the proper orientation and enough force to produce a new product.
There are mainly five types of reaction.
Synthesis reactionAcid base reactionRedox reactionDecomposition reactionPrecipitation reactionThus, Lithium react slowly with water while potassium react violently with water. potassium caught fire while lithium does not caught fire.
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