be sure to answer all parts a 10.0−ml solution of 0.660 m nh3 is titrated with a 0.220 m hcl solution. calculate the ph after the following additions of the hcl solution:
Answers
The pH of the solution remains constant at 4.74 with 0.0 mL of HCl, becomes neutral (pH 7) with 10.0 mL of HCl, and becomes increasingly acidic with 30.0 mL (pH 3.37) and 40.0 mL (pH 2.19) of HCl added.
a) V₂=0.0 mL
In this case, there is no HCl added to the NH₃ solution, so the pH will be equal to the pKb of NH₃, which is 4.74.
b) V₂=10.0 mL
In this case, the moles of HCl added is equal to the moles of NH₃ in the solution. The reaction between HCl and NH₃ is:
NH₃ + HCl → NH₄Cl
This reaction produces a salt, NH₄Cl, which is a neutral salt. Therefore, the pH of the solution after the addition of 10.0 mL of HCl will be 7.0.
c) V₂ =30.0 mL
In this case, the moles of HCl added is greater than the moles of NH₃ in the solution. The excess HCl will react with water to produce hydronium ions, which will make the solution acidic. The pH of the solution after the addition of 30.0 mL of HCl can be calculated using the following equation:
pH = -log[H⁺]
where [H⁺] is the concentration of hydronium ions. The concentration of hydronium ions can be calculated using the following equation:
\([H+] = \frac{C_2V_2}{V_1 + V_2}\)
where C₂ is the concentration of HCl solution, V₂ is the volume of HCl solution added, and V₁ is the initial volume of NH₃ solution.
Substituting the given values, we get:
\([H+] = \frac{0.220\ \text{M} \cdot 30.0\ \text{mL}}{10.0\ \text{mL} + 30.0\ \text{mL}} = 0.440\ \text{M}\)
Therefore, the pH of the solution after the addition of 30.0 mL of HCl is:
\(pH = -log(0.440\ \text{M}) = 3.37\)
d) V₂=40.0 mL
In this case, the moles of HCl added is twice the moles of NH₃ in the solution. The excess HCl will react with water to produce hydronium ions, which will make the solution even more acidic. The pH of the solution after the addition of 40.0 mL of HCl can be calculated using the same equation as above.
Substituting the given values, we get:
\([H+] = \frac{0.220\ \text{M} \cdot 40.0\ \text{mL}}{10.0\ \text{mL} + 40.0\ \text{mL}} = 0.660\ \text{M}\)
Therefore, the pH of the solution after the addition of 40.0 mL of HCl is:
\(pH = -log(0.660\ \text{M}) = 2.19\)
Conclusion:
The pH of the solution after the addition of HCl will increase as the volume of HCl added increases. This is because the excess HCl will react with water to produce hydronium ions, which will make the solution acidic.
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Related Questions
When using a properly stabilized balance, how should you ensure that you get the most accurate mass reading possible?.
Answers
When using a properly stabilized balance, we should ensure that the
most accurate mass reading possible is gotten by doing the following:
Measure the mass of the sample at room temperature.Close the side shields on the balance during reading.What is a Balance?A balance is an equipment which is used to measure the mass of objects.
It is best to measure the mass of the sample at room temperature to
prevent loss or reabsorption of water and to ensure air currents don't
affect the reading.
The side of the balance should be closed to prevent any form of
interference from the external environment.
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2. At about what temperature will 37 g of both copper(II) sulfate and potassium chloride disse
in 100 g of water?
Answers
The temperature at which 37 g of both copper(II) sulfate and potassium chloride dissolve in 100 g of water is approximately 38 ⁰C.
What is solubility?The solubility of a substance is its ability to be dissolved in water.
Solubility of 37 g of Copper (II) sulfateThe solubility of 37 g of Copper (II) sulfate is determined from the solubility curve of Copper (II) sulfate.
Solubility of 37 g of potassium chlorideThe solubility of 37 g of potassium chloride is determined from the solubility of potassium chloride.
Thus, from the solubility charts, the temperature at which 37 g of both copper(II) sulfate and potassium chloride dissolve in 100 g of water is approximately 38 ⁰C.
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what weight of potassium hydrogen phthalate will require 40.0 ml of a 0.100 m naoh solution to reach the equivalence point?
Answers
The weight of potassium hydrogen phthalate that will require 40.0 ml of a 0.100 m NaOH solution to reach the equivalence point is 0.8169 grams.
In order to find out the weight of potassium hydrogen phthalate that will require 40.0 ml of a 0.100 m NaOH solution to reach the equivalence point, we can use the following formula: weight of KHP = (molarity of NaOH) x (volume of NaOH) x (molar mass of KHP) / 1000
First, we need to calculate the number of moles of NaOH required to reach the equivalence point: Moles of NaOH = (molarity of NaOH) x (volume of NaOH) / 1000 Moles of NaOH = (0.100 mol/L) x (40.0 mL) / 1000 Moles of NaOH = 0.004 mol.
Now we can use the number of moles of NaOH to calculate the weight of KHP required: Weight of KHP = (0.004 mol) x (204.22 g/mol), Weight of KHP = 0.8169 g. Therefore, the weight of potassium hydrogen phthalate that will require 40.0 ml of a 0.100 m NaOH solution to reach the equivalence point is 0.8169 grams.
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What is the name of Br6F10 ?
Answers
Answer:
isopropyl alcohol
Explanation:
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What does the result table indicate about the solute in this solution
Answers
The result table indicate that A. The solute is a SOLID because it has a DECREASE in the amount dissolved as temperature decreases.
What is describes solubility?The solubility of a solid solute in a liquid solvent generally decreases as the temperature decreases. This is because the kinetic energy of the solute molecules decreases as the temperature decreases. As the kinetic energy of the solute molecules decreases, they are less likely to have enough energy to escape from the solution and enter the gas phase.
In the table, as the temperature decreases, the concentration of the solute in the solution decreases. This indicates that the solute is a solid and that the solubility of the solute decreases as the temperature decreases.
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Write your explanation on how plants
nake their own food?
imnortont bynroduct of
Answers
Answer:
photosynthesis are ligt water and carbon dioxide
Explanation:
Plants make their own food out of inorganic compounds through a process called photosynthesis that takes place in the leaves. The ingredients necessary for photosynthesis are light, water and carbon dioxide.
What would life on Earth be like without the Sun?
Answers
The world would be dark without sunlight. Animals, vegetation, and people would not exist. Without other life, there wouldn't be any.
There won't be any light from the Moon. Only because sunlight reflects off of the Moon can we see it. The Moon would vanish as the sunlight that was illuminating it did. The numerous other celestial objects in the sky, such planets, that humans can only see because of the Sun's reflected light, would also fall under this category.
Earth would swiftly become much colder without the Sun's warmth. Fortunately, Earth's ability to retain heat means that humans wouldn't immediately freeze. But life would start getting much harder right away.
Although no one can foresee the future with certainty what will happen, scientists believe that within a week or so, the average worldwide surface temperature would fall below 0 degrees Fahrenheit. You've probably endured temperature like these before during the chilly winter months.
The issue is that the temperature would keep progressively dropping. The average surface temperature of the entire planet might fall much below -100° F in just one year! The world's sea's surface layers would have frozen over by then. Although the deep waters below would be kept liquid for hundreds of thousands of years by the frozen upper layers of the oceans, they would finally freeze as Earth headed toward a stable average global surface temperature of roughly -400° F. Any remaining humans would then be exposed to the severe cosmic radiation that comes from space because the atmosphere would likewise have frozen and dropped to Earth by that time.
All photosynthesis on Earth would cease if the Sun's rays were to disappear. All living things that depend on plants for food, including humans, will eventually perish along with all plants. While some resourceful people might be able to live without the Sun for a few days, weeks, or even years, it would eventually become impossible to sustain life on Earth.
Hence, There will be no life on earth because sun is the ultimate source.
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1 point
What is the density of a 240.90 g salt water solution with a volume of
200.00 mL?*
Your answer
Answers
Answer:
Explanation:
we know that density=mass/volume
mass=240.90 g
volume=200.00 ml
now
density=240.90 g/200.00
density=1.2045 g/ml
another way
1 dm^3 =1000 ml
200.00 ml =200.00/1000
200.00 ml=0.2 dm^3
now density=240.90 g/0.2 dm^3
density=1204.5 g/dm^3
Other than providing vital oxygen, how else do plants support us, especially considering our diet of plants and animals (which could include crickets)?
Answers
Plants serve as the main source of nutrition for humans as well as provide many products for human use, such as firewood, timber, fibers, medicines, dyes, oils, and rubber.
Plants are multicellular eukaryotic organisms whose mode of nutrition is mainly autotrophic.
Plants play many important roles in life more especially that of producing food on which many other organisms depend on.
Some of the important ways by which plants support human life include:
Provision of food: plants trap the energy of the sunlight and through the process of photosynthesis produce food on which other living organisms such as animals depend on.Provision of oxygen: during the process of photosynthesis, plant release oxygen into the atmosphere which is needed by animals for respiration.Recycling of water: through the process of transpiration occurring in leaves of plants, water is recycled in nature.Provision of other products such as timber, fibers, medicines, dyes, oils, and rubber.Therefore, plants serve as the main source of nutrition for humans as well as provide many products for human use, such as timber, fibers, medicines, dyes, oils, and rubber.
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A solute is dissolved in a liquid. how does the osmotic pressure of the solution compare to the osmotic pressure of the pure liquid?
Answers
The osmotic pressure of the pure liquid is more as company to the osmotic pressure of the solution.
A strain large than the osmotic strain is implemented to the answer side , the natural solvent flows out of the answer thru semi - permeable membrane and this phenomenon is known as as opposite osmosis.
Since attention of solute is extra in an answer than in natural water, water from natural water attempts to diffuse or go through osmosis to the answer. Hence, the strain required to save you water access to the solution, i.e. osmotic strain of an answer is constantly better than that of natural water or solvent. As increasingly solute is dissolved withinside the solvent, the attention of the answer is going on increasing.
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What is the name of the acid CH3COOH
Answers
Answer:
CH3COOH is Acetic acid.
The ____number can vary among atoms of the same element.
Answers
Answer:
Mass number
Explanation:
All atoms of the same element have the same number of protons, but some may have different numbers of neutrons, which would cause a different mass number
Answer:
The answer is mass number
What must the distance be between charges of +1.85 and −1.66 for the attractive force between them to be the same as that between charges of +4.16 and −2.21 separated by a distance of 2.16 pm?
Answers
Force is:F = k*(q1 + q2) / r2 In light of this, k * (2.35 * 1.96) / r2 = k * (4.06 * 2.11) / ( 2.26 ) ² / : k4.606 / r² = 8.5666 / 5.10768.5666 r² = 4.606 * 5.1076r² = 23.5256 : 8.5666r² = 2.7462r = √2.7462. Reply: r = 1.66 pm
Forces: How do they work?When two (or more) objects interact, forces are produced. Both act on the other with an equal but opposing power. As a thing moves, external forces are at work. The object moves uniformly regardless of an internal force.
What is force, and what is its unit?The state of rest or motion of an object, as well as the shape of the object, can all be changed or may have a tendency to be changed by force, which is a physical cause. A force is measured in Newtons in the S.I.
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What evidence did Dwight "Rocky" Crandell find that indicated the map he made near Lake Tapps in Washington was a massive lahar from Mt. Rainier and not an old glacier? (Select all that apply)
- actively flowing lava
- whole logs mixed in with the rocks
- clay sized particles
- an abundance of snow and ice
Answers
The evidence that indicated that the map made near Lake Tapps in Washington was a massive lahar from Mt. Rainier and not an old glacier: Whole logs mixed in with the rocks, Clay-sized particles and An abundance of snow and ice
The following evidence indicated that the map made near Lake Tapps in Washington was a massive lahar from Mt. Rainier and not an old glacier:
Whole logs mixed in with the rocks: The presence of whole logs mixed in with the rocks suggests a rapid and powerful flow, characteristic of a lahar, rather than the slow movement associated with glaciers.
Clay-sized particles: The presence of clay-sized particles is often associated with lahars, as they can be easily transported by the flowing volcanic material.
An abundance of snow and ice: The presence of snow and ice is indicative of a recent event, as glaciers tend to accumulate and retain snow and ice over time. In the case of a lahar, the presence of snow and ice suggests a more recent deposition.
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Farmer Brown is planting crops in his fields. He wants to prevent the topsoil from being blown away by the wind or washed away by water. Which sustainable farming practice should he use?
A) inter cropping
B) cover crops
C) crop rotation
D) tillage
Answers
Give the theoretical van't Hoff factor i for each of the following:(This is the i used in the calculation of osmolarity.)C12H22O11
Answers
Answer
The theoretical Van't Hoff factor i for C12H22O11 is 1
Explanation
The Van't Hoff factor, i, is the number of particles formed in a solution from one formula unit of solute.
The Van't Hoff factor, i, is a property of the solute. In an ideal solution, i does not depend on the concentration of the solution.
For a nonelectrolyte, like (C12H22O11), which does not separate into ions in solution, Van''t Hoff factor, i = 1 because 1 molecule of sucrose (C12H22O11) forms only one particle in solution.f
what is the coefficient in front of the no when the equation below is balanced? nh₃(g) o₂ (g) → no(g) h₂o (g)
Answers
The coefficient in front of NO when the equation is balanced is 2.
To balance the chemical equation NH₃(g) + O₂(g) → NO(g) + H₂O(g), we need to adjust the coefficients in front of each compound to ensure that the number of atoms of each element is equal on both sides of the equation.
Starting with the nitrogen (N) atoms, we have one nitrogen atom in NH₃ and one nitrogen atom in NO. To balance the nitrogen atoms, we assign a coefficient of 2 in front of NH₃:
2 NH₃(g) + O₂(g) → NO(g) + H₂O(g)
Next, let's consider the oxygen (O) atoms. We have two oxygen atoms in O₂ and one oxygen atom in NO. To balance the oxygen atoms, we assign a coefficient of 2 in front of NO:
2 NH₃(g) + O₂(g) → 2 NO(g) + H₂O(g)
Now, let's check the hydrogen (H) atoms. We have six hydrogen atoms in NH₃ and two hydrogen atoms in H₂O. The hydrogen atoms are already balanced.
Therefore, the balanced equation is:
2 NH₃(g) + O₂(g) → 2 NO(g) + H₂O(g)
The coefficient in front of NO is 2, indicating that two moles of NO are produced for every two moles of NH₃ that react.
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The coefficient in front of NO in the balanced chemical equation 4NH₃(g) + O₂ (g) → 4NO(g) + 2H₂O (g) is 4.
Explanation:In order to identify the coefficient in front of the NO when balancing the equation NH₃(g) + O₂ (g) → NO(g) + H₂O (g), we first need to balance other parts of the equation.
We have 1 nitrogen in NH₃ on the left and 1 nitrogen in NO on the right, so nitrogen is balanced. For hydrogen, we have 3 in NH₃ on the left and 2 in H₂O on the right. To balance the hydrogen atoms, we can increase the coefficient in front of the H₂O to a 2: NH₃(g) + O₂ (g) → NO(g) + 2H₂O (g).
Now we have 3 atoms of oxygen on the left (1 from NO and 2 from 2H₂O) and 2 on the right (from O₂). That means we need to increase the coefficient in front of NO to 4: NH₃(g) + O₂ (g) → 4NO(g) + 2H₂O (g). And lastly, to balance the nitrogens, we increased the NH₃ to 4: 4NH₃(g) + O₂ (g) → 4NO(g) + 2H₂O (g).
So, the coefficient in front of the NO when the equation is balanced is 4.
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An exergonic reaction __________ free energy, and an endergonic reaction __________ free energy.
Answers
An endergonic reaction absorbs free energy
A certain gas has a volume of 195 mL at 20°C and 1.00 atm. What is the its volume in mL at60°C and 600 mm Hg?
Answers
To solve this question we will assume that the moles of gas do not change and that the gas behaves like an ideal gas.
For an ideal gas we have that its behavior will be according to the following equation:
\(PV=nRT\)Where,
P is the pressure of the gas, in atm
V is the volume of the gas, in liters
n are the moles of the gas
T is the temperature of the gas, in Kelvin
R is a constant, 0.08206 atm.L/mol.K
We have for this gas two states, an initial state (1) and a final state (2), so for each state we can apply the ideal gas law, we will have:
Initial state:
\(\begin{gathered} P_1V_1=nRT_1 \\ nR=\frac{P_1V_1}{T_1} \end{gathered}\)Final state:
\(\begin{gathered} P_2V_2=nR_T_2 \\ nR=\frac{P_2V_2}{T_2} \end{gathered}\)Since nR are constants, we can equate both equations:
\(\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}\)For each state the conditions of pressure, volume and temperature will be:
P1=1.00atm
V1=195mL = 0.195L
T1=20°c = 293.15K
P2= 600mmHg=0.79atm
T2=60°C=333.15K
V2=Unknown
We clear V2 and replace the known data:
\(V_2=\frac{P_1V_1}{T_1}\times\frac{T_2}{P_2}\)\(\begin{gathered} V_2=\frac{1atm\times0.195L}{293.15K}\times\frac{333.15K}{0.79atm} \\ V_2=\frac{1\times0.195\times333.15}{293.15\times0.79}L \\ V_2=0.280L=280mL \end{gathered}\)Answer: The final volume of the gas will be 280mL
How much heat is released as the temperature of 465 g of water drops from 75.0°C to 18.2°C?
Answers
The heat released : -110560.632 J
Further explanationHeat can be calculated using the formula:
Q = mc∆T
Q = heat, J
m = mass, g
c = specific heat, joules / g ° C
∆T = temperature difference, ° C / K
Knownm =465 g
c water = 4.186 J/gram °C
∆T = temperature difference = 18.2 - 75 = - 56.8 °C
Then the heat :
\(\tt Q=m.c.\Delta T\\\\Q=465\times 4.186\times -56.8\\\\Q=\boxed{\bold{-110560.632~J}}\rightarrow -=exothermic\)
Is 2CO + O2 -> 2CO2 A balanced or unbalanced equation
Answers
Answer:
It is balanced.
Explanation:
You have the same amount of atoms on both sides. 2 carbon and 4 oxygen.
fluids that are used to boil and absorb heat are called refrigerants.
Answers
Answer:
yes??
Explanation:
The diameter of neutral atoms generally decreases going left to right across one period on the periodic table. What change causes this decrease in diameter of atoms?
Answers
Explanation:
Atomic size gradually decreases from left to right across the periodic table because within a period of elements, all electrons are added to the same shell. However, at the same time, protons are being added to the nucleus, making it more positively charged. The effect of increasing proton number is greater than that of the increasing electron number. Therefore, there is a stronger nuclear attraction. This means that the nucleus attracts the electrons more strongly, pulling the atom's electron shells closer to the nucleus. As a result, the atomic diameter of the atom decreases.
Which statements describe why high-demand engines such as those in airplanes and large trucks use biodiesel instead of ethanol?
- Biodiesel is much more cost-effective than ethanol. - Biodiesel contains more energy per volume than ethanol. - Biodiesel is more readily available than ethanol worldwide. - Biodiesel can be used directly in most newer diesel engines.
Answers
Engines do not need to be modified or adapted to use biodiesel, making it an easy and convenient fuel choice for high-demand engines.
High demand engines such as those found in airplanes and large trucks use biodiesel instead of ethanol due to the following reasons:
Biodiesel contains more energy per volume than ethanol.
Biodiesel is more readily available than ethanol worldwide.
Biodiesel can be used directly in most newer diesel engines.
The first and most important reason why high-demand engines use biodiesel instead of ethanol is that biodiesel contains more energy per volume than ethanol.
This means that engines running on biodiesel can run for longer periods of time before needing to refuel.
Another reason why high-demand engines such as those found in airplanes and large trucks use biodiesel instead of ethanol is that biodiesel is more readily available than ethanol worldwide.
This makes it much easier for engines to be fueled no matter where they are located.
Finally, biodiesel can be used directly in most newer diesel engines.
This means that engines do not need to be modified or adapted to use biodiesel, making it an easy and convenient fuel choice for high-demand engines.
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what is the mass of 4.900 x 10^25 atoms of He
Answers
ABC, Incorporated, has a beginning receivables balance on January 1st of $670. Sales for January through April are $430, $460, $540 and $560, respectively. The accounts receivable period is 60 days. How much did the firm collect in the month of March
Answers
Accounts refer to financial records that track the flow of money in and out of a company. Receivables are one type of account that represents the money owed to a company by its customers for goods or services provided.
We need to understand the concept of balance and accounts. Accounts refer to financial records that track the flow of money in and out of a company. Receivables are one type of account that represents the money owed to a company by its customers for goods or services provided. The balance of receivables is the amount owed to the company at a specific point in time.
Now, let's calculate the average daily sales for the period of January through April. First, add up the sales for each month ($430 + $460 + $540 + $560 = $1,990). Then divide by the number of days in the period (120 days = $1,990 ÷ 120 = $16.58 per day). Since the accounts receivable period is 60 days, this means that on average, the firm collects payments for sales made 60 days ago.
To determine how much the firm collected in the month of March, we need to look at the sales made in January. Since January sales were $430, this means that in March, the firm collected 60% of that amount ($430 x 0.60 = $258). Therefore, the firm collected $258 in the month of March.
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_________ the emission of previously-absorbed energy from excited, high energy electrons. For chlorophyll the emission is a photon of red light.
Answers
Fluorescence is the emission of previously-absorbed energy from excited, high energy electrons. When an electron in a molecule, such as a chlorophyll molecule in a photosynthetic system, absorbs a photon of light, it becomes excited and moves to a higher energy level.
However, this excited state is unstable and the electron will eventually return to its ground state, releasing the absorbed energy in the form of a photon of light. In the case of chlorophyll, the emitted photon of light is in the red part of the visible spectrum, which is why chlorophyll-containing plant tissues often appear red under fluorescent light.
Fluorescence is a useful tool in studying photosynthesis as it allows researchers to measure the efficiency of energy transfer within the photosynthetic system. By measuring the intensity and duration of fluorescence, researchers can gain insight into the efficiency of energy transfer from excited electrons to the final electron acceptor, and identify potential limitations or inefficiencies in the process.
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Chloroform (CHCl3), an important solvent, is produced by a reaction between methane and chlorine.
CH4(g) + 3 Cl2(g) CHCl3(g) + 3 HCl(g)
How many grams of CH4 is needed to produce 56.0 g CHCl3?
Answers
Which of these weak bases is the weakest electrolyte in aqueous solution? ethyl amine, Kb = 4.3 x 10-4 O aniline, Kp = 4.0 x 10-10 O hydrazine, Kp = 8.5 x 10-7 O trimethyl amine, Kb = 6.5 x 10-5
Answers
Among the given weak bases, aniline is the weakest electrolyte in an aqueous solution.What is an electrolyte?An electrolyte is a substance that conducts electricity in an aqueous solution or in a molten state.
In water, they break up into ions and conduct electricity. Electrolytes may be categorized into two types: strong and weak electrolytes. Strong electrolytes dissociate completely into ions in aqueous solution, whereas weak electrolytes only partially dissociate into ions and exist in equilibrium with undissociated molecules. In the given weak bases, aniline is the weakest electrolyte.
Here's how to solve the problem: Aniline has a Kp of 4.0 × 10-10, which is the smallest value of Kp among all the given weak bases. Therefore, aniline is the weakest electrolyte in an aqueous solution.
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Determine the isotope symbol that fits each description. a. 68 neutrons, 47 electrons b. mass number = 197, 79 electrons c. atomic number = 86, 136 neutrons d. atomic number = 76, mass number = 192
Answers
The isotope symbol that fits each description is as follows: 68 neutrons, 47 electrons is Ag b. mass number = 197, 79 electrons is Au c. atomic number = 86, 136 neutrons is Rn d. atomic number = 76, mass number = 192 is Os.
Isotopes are two or more atom types that share the same atomic number (number of protons in their nuclei), location in the periodic table, and chemical element but have distinct nucleon numbers (mass numbers) as a result of having a different number of neutrons in their nuclei. Although the chemical properties of each isotope of a given element are nearly identical, they differ in their atomic weights and physical characteristics.
The name "isotope" refers to the fact that different isotopes of the same element occupy the same location on the periodic table. The word "isotope" is derived from Greek origins that mean "the same place".
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