what mass (in grams) of potassium acetate, kc2h3o2, must be added to 132 ml of 0.010 m acetic acid to form a buffer solution with a ph of 4.68? (ka (hc2h3o2)
Answers
0.0986 g of potassium acetate is needed to make the desired buffer solution.
To calculate the mass of potassium acetate needed to form a buffer solution, we need to use the Henderson-Hasselbalch equation:
pH = pKa + log([A⁻]/[HA])
where pH is the desired pH of the buffer solution, pKa is the acid dissociation constant of acetic acid, [A⁻] is the concentration of the conjugate base (acetate ion) and [HA] will be the concentration of the weak acid (acetic acid).
Rearranging this equation, we can solve for the ratio of [A⁻]/[HA]:
[A⁻]/[HA] =\(10^{(pH-pKa)}\)
Substituting the given values, we have:
[A^-]/[HA] = \(10^{(4.68-4.76)}\) = 0.767
The total concentration of the buffer (acetic acid and acetate ion) should be equal to the desired concentration of the buffer, which is the same as the concentration of acetic acid given in the problem:
Total concentration = [A⁻] + [HA] = 0.010 M
We can use these two equations to solve for the concentrations of acetate ion and acetic acid:
[A⁻] = 0.767 / (0.767 + 1) x 0.010 M = 0.0076 M
[HA] = 0.010 M - 0.0076 M = 0.0024 M
Now, we can use the molar mass of potassium acetate to calculate the mass needed to make the desired buffer solution:
Molar mass of KC₂H₃O₂ = 98.14 g/mol
Mass of KC₂H₃O₂ = moles x molar mass
Moles of KC₂H₃O₂ = [A⁻] x volume / 1000
Volume is 132 mL = 132/1000 = 0.132 L
Moles of KC₂H₃O₂ = 0.0076 M x 0.132 L = 0.0010032 moles
Mass of KC₂H₃O₂ = 0.0010032 moles x 98.14 g/mol
= 0.0986 g
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Related Questions
which statement is true?responsesoxidation reactions occur at the cathode.oxidation reactions occur at the cathode.synthesis reactions occur at the anode.synthesis reactions occur at the anodebustion reactions occur at the anodebustion reactions occur at the anode.reduction reactions occur at the cathode.reduction reactions occur at the cathode.
Answers
Answer: the synthesis reaction occur at anode option (3) is correct
Explanation:
In electrochemistry, an oxidation reaction occurs at the anode of an electrochemical cell. The anode is the electrode where oxidation takes place, and electrons are released into the external circuit. This electron loss results in an increase in the oxidation state of the anode material.
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The complete combustion of ethanol, to form CO2(g) and H2O(g) at constant pressure releases 726.7 kJ of heat per mole of (a) Write a balanced thermochemical equation for this reaction. a) Draw an enthalpy diagram for the reaction.
Answers
(a) First, we need to write the combustion reaction for ethanol (CH3CH2OH)
CH3CH2OH + O2 → CO2 + H2O
Then, we need to balance this equation. To do that, remember to start with C, then move on to H and finally balanced the amount of O:
CH3CH2OH + 3 O2 → 2 CO2 + 3 H2O
(b) Since this is a reaction that realeases heat (726.7 kJ /mol of ethanol), we know that is an exothermic reaction and the general scope of an enthalpy diagram would be like this:
Where, for the combustion of ethanol, the reactants would be CH3CH2OH + O2, the products would be CO2 + H2O, and ΔH would be -726.7 kJ/mol
Which equation agrees with the ideal gas law?
Answers
The ideal gas law is consistent with P1/P2 = T1/T2. This is the best option out of the ones provided, therefore.
What can we infer from the ideal gas law?According to the ideal gas law, for instance, a gas's pressure, volume, and temperature are all precisely proportional to one another as long as its mass and particle count are constant.
How can we simplify the ideal gas law?A theoretical gas called an ideal gas is one that has many of randomly moving particles but doesn't have any interparticle interactions. The converse is true for a real gas; it takes up space and its molecules interact. As a result, PV is always equal to nRT.
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using water and air as examples, what is an approximate ratio of the densities of liquids to gasses?
Answers
The approximate ratio of densities of liquids to gases is around 1000:1. This means that on average, liquids are about 1000 times denser than gases. For example, water has a density of 1000 kg/m3 while air has a density of around 1.2 kg/m3.
The approximate ratio of the densities of liquids to gases can be found by comparing the densities of water and air. Water has a density of about 1,000 kg/m³, while air has a density of approximately 1.2 kg/m³. Therefore, the ratio of the densities of liquids to gases is roughly 1,000:1.2, or approximately 833:1 when simplified.
Density is a physical property of matter that describes the amount of mass per unit volume of a substance. It is usually expressed in grams per cubic centimeter (g/cm³) or kilograms per cubic meter (kg/m³). The formula for density is:
Density = Mass / Volume
where mass is the amount of matter in an object, and volume is the space occupied by that matter. Density can help to identify and compare different substances since each substance has a unique density value.
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5)
Experiments with gold foil indicated that atoms
A)
usually have a uniform distribution of positive charges
B)
usually have a uniform distribution of negative charges
C)
contain a positively charged, dense center
D)
contain a negatively charged, dense center
Answers
Answer:
c
Explanation:
I just learned all this in chemistry too lol
got 100 on the test last week so its good
Experiments with gold foil indicated that atoms contain a positively charged, dense center and the correct option is option C.
Experiments with gold foil, known as the Rutherford gold foil experiment, were conducted by Ernest Rutherford in 1911. In this experiment, he bombarded a thin gold foil with alpha particles.
Most of the alpha particles passed through the foil with little deflection, but some of them were deflected at large angles, and a small fraction even bounced back. This observation led Rutherford to conclude that the atom contains a positively charged, dense center called the nucleus, where most of its mass is concentrated. He proposed the nuclear model of the atom, which became a significant advancement in the understanding of atomic structure.
Thus, the ideal selection is option C.
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t/f : Matter is the material from which all known physical objects are made.
Answers
Matter is the material from which all known physical objects are made. True. Everything in the universe is made of matter
Matter is anything that has mass and occupies space in the universe, both living and non-living things. Matter can be elements, compounds or mixtures and can be changed from one form of matter to another. Matter can be grouped into 3 different states of being namely, solid, liquid, and gas. Examples are water, trees, air, book, and soil.
Each material has certain properties that make it easy to distinguish it from other substances. Material properties can are grouped into two, namely physical properties that can be measured directly and chemical properties related to the ability of a substance to react or change into another substance.
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Consider the equilibrium equation for a general reaction: A + B C + D. Explain what happens to the reactants and products from Time 0 until the reaction reaches equilibrium.
Answers
Answer:
See explanation
Explanation:
For the equilibrium; A + B ⇄C + D
At time = 0 secs, the concentration of products is zero while the concentration of reactants decreases steadily.
As time goes on, the concentration of the reactants continues to decrease while the concentration of products increases.
At equilibrium the concentration of both reactants and products are now the same because the rate of forward reaction is equal to the rate of reverse reaction are now the same.
Ideal gas law:
If 6.3 moles of a gas in a 20 L cylinder have a pressure of 5.5 atm, what is the temperature?
Answers
Answer:
212. 9 degree celcius
Explanation:
From PV =nRT
T= PV/nR
T= (5. 5x20)/(6. 3x0. 082)
T= 110/0. 5166
T= 212. 9 degree celcius
CH3 CH3 CH3-CH2-CH=CH-CH-CH-C-CH-CH3 CH3 COMO SE LLAMA?
Answers
What do u need help with
how to calculate percent error chemistry
Answers
All of this is summed up with the formula: Percentage Error is equal ((Estimated Number – Actual Number)/ Actual number) x 100.
Depending on how close to the true value a measurement is, it may be accurate or inaccurate. Imagine you are conducting an experiment to find out how dense a sample of aluminum metal is. The true or accurate value of a measurement is one that is based on widespread agreement with an authoritative reference.
The accepted density for aluminum is 2.70g/cm3. A measurement's experimental value is its value as it is observed during the experiment. Let's say your experiment yields the experimental result that the aluminum density is 2.42g/cm3. The discrepancy between experimental and accepted values is an experiment's error.
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Once the membrane potential becomes positive, Na+ channels enter the ______ conformation
Answers
Once the membrane potential becomes positive, Na+ channels enter the "inactivated" conformation.
This process occurs during an action potential, which is an electrical signal that travels along a neuron's membrane. The action potential is initiated when a stimulus causes the membrane potential to become less negative, ultimately reaching the threshold potential. At this point, voltage-gated Na+ channels open, allowing an influx of Na+ ions into the neuron, causing the membrane potential to become positive.
This positive membrane potential activates the inactivation gate of the Na+ channels, causing them to enter the inactivated conformation. Inactivation is crucial for proper functioning of the action potential, as it ensures that the signal propagates in only one direction and prevents continuous firing of the neuron. The inactivation gate closes the channel and prevents further flow of Na+ ions, even though the membrane potential remains positive.
As the action potential continues, voltage-gated K+ channels open, allowing K+ ions to flow out of the neuron, which helps restore the negative resting membrane potential. Eventually, the Na+ channels transition from the inactivated to the closed (resting) state, resetting their availability for future action potentials.
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Which statement is true about your mass
A: you would have less mass on the moon
B:you would have less mass on earth
C: you would have more mass on earth
D: you would have the same mass on the earth and moon
Answers
which of the following salts, when dissolved in water, will decrease the ph of the solution? nh4cl khso4 nahco3
Answers
Among the mentioned salts, the one that will decrease the pH of a solution when dissolved in water is NH₄Cl.
Here's an explanation of why NH₄Cl acts as an acid when dissolved in water:
NH₄Cl(ammonium chloride) is an example of an acid salt.
When it dissolves in water, it dissociates into its respective ions: NH₄⁺ (ammonium ion) and Cl⁻ (chloride ion).
The ammonium ion (NH₄⁺) has the potential to act as a weak acid by donating a proton (H⁺) to the water molecule, leading to the formation of hydronium ions (H₃O⁺). The presence of more hydronium ions in the solution increases the concentration of H⁺ ions, resulting in a decrease in pH.
On the other hand, KHSO₄ (potassium bisulfate) and NaHCO₃ (sodium bicarbonate) behave differently when dissolved in water:
1. KHSO₄: When potassium bisulfate dissolves in water, it dissociates into K⁺ (potassium ion) and HSO₄⁻ (hydrogen sulfate or bisulfate ion).
The hydrogen sulfate ion is a weak acid, but it is not as acidic as the ammonium ion in NH₄Cl.
Therefore, the pH change caused by KHSO₄ is relatively small, and it may not significantly decrease the pH of the solution.
2. NaHCO₃: Sodium bicarbonate, also known as baking soda, is a basic salt.
When dissolved in water, it dissociates into Na⁺ (sodium ion) and HCO₃⁻ (bicarbonate ion).
The bicarbonate ion has the ability to accept a proton (H⁺) from water, leading to the formation of hydroxide ions (OH⁻) and reducing the concentration of H⁺ ions.
This makes the solution more basic and increases the pH rather than decreasing it.
In summary, NH₄Cl is the salt that, when dissolved in water, will decrease the pH of the solution. KHSO₄ may have a small effect on pH, while NaHCO₃ will increase the pH of the solution, making it more basic.
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Difference between
Atom and molecule
Answers
Answer:
Atoms are single neutral particles. Molecules are neutral particles made of two or more atoms bonded together.
Explanation:
its on safari ??????????
what is the moon phase two weeks before a new moon?
Answers
Answer:
Full Moon is the phase two weeks before new moon
renata developed a hair dye additive that is guaranteed to cover grey hair. she granted the right to use this additive to a major hair collor manufacturer, and renata now recives a
Answers
What Renata has granted to the manufacturer of the colored hair dye is called a patent.
What is a patent?A patent is a right given to a manufacturer to be the sole producer of a product for a given period of time. Usually, the patent has to last for a given number of years after which the technology becomes commonplace.
Hence, what Renata has granted to the manufacturer of the colored hair dye is called a patent.
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can carbon dioxide affect decomposers
Answers
When an organism dies, bacteria degrade it. During the decomposition process, carbon dioxide is emitted into the environment or water. Hence, it has no impact on the decomposers.
Explain about the Respiration and Decomposition?When animals breathe or decay (decompose), carbonate rocks are worn, forest fires happen, and volcanoes erupt, carbon dioxide is naturally released into the atmosphere.
The exchange of carbon dioxide and oxygen between an animal's blood and its surroundings is one definition of respiration. When living things breathe, carbon dioxide is ultimately released.Cellular respiration is another aspect of respiration. Carbon dioxide plus water vapor are gases that all animals and vegetation release back into the atmosphere. For a cell to produce all energy it requires, it must breathe. Cellular respiration is the term for this process. By mixing glucose plus oxygen from the air, organisms create energy during the process of respiration. Glucose and oxygen are converted into both energy and dioxide during cellular respiration.Thus, even during process of cellular respiration, carbon dioxide is expelled into the atmosphere. Hence, it has no impact on the decomposers.
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Chuck wants to know how many electrons in an atom are not paired up. Which model would be best for Chuck to
write out?
Answers
Answer:
D. an orbital notation of the atom
Explanation:
Orbital notiation uses lines and arrows to show shells, subshells, and orbitals for electrons in an atom. Since it shows arrows being paired up in this diagram it would be the best model for Chuck to use.
what are similarities and differences in the atoms structure among the elements going down a family that explain these trends
Answers
All elements in a family share the same number of valence electrons in their outermost energy level, which explains the similar chemical behavior of the elements in a family.
Exploring the Structure of Atoms in a Family and Its Impact on Chemical PropertiesSimilarities: All elements in a family have the same number of valence electrons in their outermost energy level. This shared valence shell is responsible for the similar chemical behavior of the elements in a family.Differences: As you move down a family, the atomic number of the elements increases, which means there are more protons and electrons in the atom.This increases the nuclear charge, which causes the electrons to be more strongly attracted to the nucleus. This results in the electrons being held more tightly and a decrease in ionization energy and atomic radius as you move down a family.
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i really need im so confused omg
Answers
What intermolecular forces are in solid NaCl salt?
Answers
The intermolecular forces are in the solid NaCl salt is ion - ion forces or the dipole - dipole forces of the interaction.
The Na is the metal and is capable of the donating the electrons and the Cl is the non metal and have capability of accepting the electrons. This makes the Na to form the cation and the Cl to make the anion. The dipole - dipole forces are present in the molecule which contains the oppositely charged ions one is positively charged ion and the other is the negatively charged ion.
Thus , the NaCl solid has the ion - ion intermolecular forces of the interaction .
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Which scale for measuring temperature has zero as the point that water freezes?
Answers
Answer: Celsius scale
Explanation: The Celsius scale is based on water's freezing and boiling point under standard atmospheric conditions where water freezes at 0 °C and boils at 100 °C.
The equilibrium constant of a reaction requires certain environmental variables to remain constant. These variables are _____.
pressure, temperature, and concentration
temperature and concentration
pressure, temperature, and time
None of the above.
Answers
The equilibrium constant of a reaction requires certain environmental variables to remain constant. These variables are pressure, temperature, and concentration. The correct option is A.
An equilibrium constant is a mathematical tool that enables the quantification of the extent of a chemical reaction. The equilibrium constant is symbolized by Keq, and it is utilized to determine the concentration of reactants and products present at equilibrium.
This calculation is done using the law of mass action.Keq is defined as the ratio of product concentrations to reactant concentrations in a chemical reaction taking place at equilibrium. The concentrations used in the expression for Keq are equilibrium concentrations.
As a result, Keq is a constant for a given reaction at a specific temperature. Keq is dependent on a variety of environmental variables such as temperature, pressure, and concentration. To keep the equilibrium constant stable, these variables must remain constant.
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A heavy-duty oxygen regulator is the best choice for oxyacetylene cutting because it ____.
Answers
A heavy-duty oxygen regulator is the best choice for oxyacetylene cutting because it ensures a consistent and precise flow of oxygen to the torch.
This is essential for maintaining a stable flame and achieving clean and accurate cuts. Additionally, a heavy-duty regulator is designed to handle the high-pressure demands of oxyacetylene cutting, making it more durable and reliable for this specific application.
Furthermore, a heavy-duty regulator typically includes features that enhance safety during oxyacetylene cutting. These may include pressure relief valves and gauges that allow for precise monitoring of oxygen flow and pressure.
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describe how you could prepare a pure sample of crystals of hydrated copper (ii) sulfate using dilute sulfuric acid and an excess of copper (ii) oxide
Answers
By following 7 steps explained below, you should be able to prepare a pure sample of crystals of hydrated copper (II) sulfate.
How to prepare a pure sample of crystals of hydrated copper (ii)?
To prepare a pure sample of crystals of hydrated copper (II) sulfate using dilute sulfuric acid and an excess of copper (II) oxide, you could follow these steps:
Weigh out a known quantity of copper (II) oxide (CuO). To ensure that there is an excess of copper (II) oxide, you could add approximately 20-25% more than what is theoretically required.
Add the copper (II) oxide to a beaker and slowly add dilute sulfuric acid (H2SO4) to it while stirring with a glass rod. This will result in a blue-colored solution, indicating the formation of copper (II) sulfate.
CuO + H2SO4 → CuSO4 + H2O
Continue adding sulfuric acid until all the copper (II) oxide has reacted and the solution is slightly acidic (pH 6-7). You can test the pH using a pH meter or pH paper.
Heat the solution to evaporate some of the water and increase the concentration of copper (II) sulfate in the solution. However, be careful not to evaporate all the water, as this will result in the formation of anhydrous copper (II) sulfate.
Allow the solution to cool slowly, which will encourage the formation of large crystals of hydrated copper (II) sulfate. You can also encourage crystal growth by scratching the inside surface of the beaker with a glass rod.
Filter the crystals from the solution using a filter paper and a funnel. Rinse the crystals with a small amount of ice-cold water to remove any impurities.
Dry the crystals by placing them in an oven at a low temperature until they are completely dry.
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You are on the Titanic and want to find something that will float because you didn't
get on one of the few lifeboats. You grab a large pillow. Measuring it, you find it to
be 55 cm wide, 78 cm long, 25 cm thick, and 5.50 kg. Will the pillow float?
Answers
Find volume of pillow
L=78cm
B=55cm
H=25cm
\(\\ \bull\tt\longrightarrow V=LBH\)
\(\\ \bull\tt\longrightarrow V=25(78)(55)\)
\(\\ \bull\tt\longrightarrow V=107250cm^3\)
\(\\ \bull\tt\longrightarrow V=10.72m^3\)
Now
Mass=5.5kg
\(\\ \bull\tt\longrightarrow Density=\dfrac{Mass}{Volume}\)
\(\\ \bull\tt\longrightarrow Density=\dfrac{5.5}{10.72}\)
\(\\ \bull\tt\longrightarrow Density=0.5kg/m^3\)
Density of water=1000kg/m^3
As it is less than density of water it will float on water
I WILL GIVE BRAINLIEST!!!!!!!!
If 10.0g of nitrogen is reacted with 100.0g of hydrogen, what is the excess reactant? What is the limiting reactant? Show your work.
Answers
The answer: Theoretical yield is 121.60 g of NH₃
Excess reactant is H₂
Rate limiting reactant is N₂
explanation: 100 g of Nitrogen
100 g of hydrogen
We are required to identify the theoretical yield of the reaction, the excess reactant and the rate limiting reagent.
We first write the equation for the reaction between nitrogen and hydrogen;
N₂ + 3H₂ → 2NH₃
From the reaction 1 mole of nitrogen reacts with 3 moles of Hydrogen gas.
Secondly we determine the moles of nitrogen gas given and hydrogen gas given;
Moles of Nitrogen gas
Moles = Mass ÷ Molar mass
Molar mass of nitrogen gas = 28.0 g/mol
Moles of Nitrogen gas = 100 g ÷ 28 g/mol 3.57 moles
Moles of Hydrogen gas
Molar mass of Hydrogen gas = 2.02 g/mol
Moles = 100 g ÷ 2.02 g/mol
= 49.50 moles
From the mole ratio given by the equation, 1 mole of nitrogen requires 3 moles of Hydrogen gas.
Thus, 3.57 moles of Nitrogen gas requires (3.57 × 3) 10.71 moles of Hydrogen gas.
This means, Nitrogen gas is the rate limiting reagent and hydrogen gas is the excess reactant.
Third calculate the theoretical yield of the reaction.
1 mole of nitrogen reacts to from 2 moles of ammonia gas
Therefore;
Moles of ammonia gas produced = Moles of nitrogen × 2
= 3.57 moles × 2
= 7.14 moles
But; molar mass of Ammonia gas is = 17.03 g/mol
Therefore;
Mass of ammonia gas produced = 7.14 moles × 17.03 g/mol
= 121.59 g
= 121.60 g
Thus, the theoretical amount of ammonia gas produced is 121.60 g
a ground state hydrogen atom absorbs a photon of light having a wavelength of 92.05 nm.92.05 nm. it then gives off a photon having a wavelength of 379.7 nm.379.7 nm. what is the final state of the hydrogen atom? values for physical constants can be found in the chempendix.
Answers
Answer:
The final state of the hydrogen atom is ground state after the emission of the photons.
The given parameters;
wavelength of the photon absorbed, λ₁ = 92.05 nm = 92.05 x 10⁻⁹ m
wavelength of the photon emitted, λ₂ = 1736 nm = 1736 x 10⁻⁹ m
The change in the energy of the photon is calculated as follows;
ΔE = hf₂ - hf₁
The new energy level is calculated as follows using Borh's model;
Thus, the final state of the hydrogen atom is ground state after the emission of the photons.
Explanation:
How many valence electrons are in a highly reactive metal that is explosive with
water?
A).7
B).2
C).1
D).5
Answers
A compound has an empirical formula of CH20. What is its molecular formula, if its molar mass is 360 g/mol?
a. C6H12O6
b. C12H24O12
Answers
Answer:
a
Explanation:
A actual molecule of glucose contains six carbon atoms, twelve hydrogen atoms, and six oxygen atoms.
Answer:
B.
Explanation: