Question 1

A patient's urine sample gave a reading of pH = 8.2.What is the value of [H3O+] in this solution?

Accepted Answer

A)  6.0 × 10-9 M
B)  0.91 M
C)  1.6 × 10-8 M
D)  1.6 × 108 M
E)  2.7 × 10-4 M

Question 2

A buffer solution is prepared by placing twice the concentration of propanoic acid (C2H5COOH,Ka=1.34 ×10−5) as the concentration of its conjugate base sodium propanoate into a flask.The pH of the resulting buffer solution is best described as which of the following?

Accepted Answer

A)  less than 4.87
B)  4.87
C)  between 4.87 and 9.00
D)  greater than 11.00
E)  Undeterminable; the concentrations of the acid and conjugate base must be given.

Question 3

Titration of 25.0 mL of an HCl solution of unknown concentration requires 14.8 mL of 0.100 M NaOH.What is the molar concentration of the HCl solution? NaOH(aq) + HCl(aq) → NaCl(aq) + H2O(l)

Accepted Answer

A)  0.592 M
B)  5.87 M
C)  0.0592 M
D)  0.0692 M
E)  1.25 M

Question 4

What is the [OH−] of a solution that has a pH = 10.95?

Accepted Answer

A)  1.03 M
B)  1.1 × 10-11 M
C)  8.9 × 10-4 M
D)  3.05 M
E)  7.4 × 10-5 M

Question 5

Consider two beakers,one containing 1.0 M HCl and the other containing 1.0 M CH3COOH.Which solution would have the lowest pH?

Accepted Answer

A)  1.0 M CH3COOH because its solution contains a lower hydronium ion concentration than 1.0 M HCl
B)  1.0 M HCl because its solution contains a higher hydronium ion concentration than 1.0 M CH3COOH
C)  1.0 M HCl because its solution contains a lower hydronium ion concentration than 1.0 M CH3COOH
D)  1.0 M CH3COOH because its solution contains a higher hydronium ion concentration than 1.0 M HCl
E)  Both solutions would have the same pH because they have the same concentration.

Question 6

A solution containing a buffer has an initial pH of 8.78.If a student adds 5 drops of NaOH(aq) to this solution,what would be a reasonable pH for the resulting solution?

Accepted Answer

A)  7.00
B)  8.64
C)  8.78
D)  8.89
E)  12.25

Question 7

All buffer solutions operate at a pH at or near 7.

Accepted Answer

A) True 
 B)False

Question 8

A buffer solution contains acetic acid (HC2H3O2) at a concentration of 0.225 M and sodium acetate (NaC2H3O2) at a concentration of 0.164 M.The value of Ka for acetic acid is 1.75 × 10−5.What is the pH of this buffer solution?

Accepted Answer

A)  0.137
B)  0.862
C)  2.40
D)  4.62
E)  4.76

Question 9

The pH of a 12.0 M solution of HCl is 1.1.

Accepted Answer

A) True 
 B)False

Question 10

Which of the following best represents the autoionization,or self-ionization,of water?

Accepted Answer

A)  H2O(l) ? H+(aq) + OH-(aq) 
B)  2H2O(l)  ?  2H2(aq) + O2(aq) 
C)  2H2O(l)  ?  H3O+(aq) + OH-(aq) 
D)  H2O(l) ? H2(aq) + O2-(aq) 
E)  H+(aq) + OH-(aq) ? H2O(l)

Question 11

If the hydronium ion concentration of an aqueous solution at 25°C is 5 × 10−6 M,what is the hydroxide ion concentration?

Accepted Answer

A)  2 × 10−10 M
B)  2 × 10−9 M
C)  2 × 10−8 M
D)  2 × 107 M
E)  2 × 1019 M

Question 12

What is always a characteristic of a solution that contains a buffer?

Accepted Answer

A)  The solution is neutral and has a pH of 7.
B)  The solution contains a small amount of solute dissolved in a large volume of solvent.
C)  The solution has been diluted by the addition of solvent.
D)  The solution resists large changes in pH when small amounts of acids or bases are added.
E)  The solution maintains a constant pH value; no amount of added acid or base can change the pH.

Question 13

Which statement concerning the relative strength of acids is FALSE?

Accepted Answer

A)  Strong and weak acids differ in their extent of proton transfer to water.
B)  Strong acids are good proton donors; weak acids are poor proton donors.
C)  A strong acid completely transfers its protons to water; a weak acid only partially transfers its protons to water.
D)  Strong acids produce strong conjugate bases; weak acids produce weak conjugate bases.
E)  A strong acid produces more hydronium ions in water than a weak acid of the same concentration.

Question 14

For the reaction shown below,which of the following is a conjugate acid-base pair? C5H5N(aq) + H2O(l)  ?  C5H5NH+(aq) + OH?(aq)

Accepted Answer

A)  C5H5N,H2O
B)  C5H5N,C5H5NH+
C)  C5H5NH+,OH?
D)  H2O,OH?
E)  C5H5N,C5H5NH+ and H2O,OH?

Question 15

Which of the following correctly describes what is meant by the term neutralization?

Accepted Answer

A)  the reaction between hydroxide (OH−) and water to form a base
B)  the reaction between a proton (H+) and water to form a hydronium ion (H3O+) 
C)  the reaction between an acid and a base to form a salt and water
D)  the reaction between two molecules of water,one acting as an acid and the other acting as a base
E)  the reaction between an oxidizing agent and a reducing agent

Question 16

Formic acid (HCO2H) is a weak acid found in the venom of bees and ant stings.Which of the following is an accurate statement concerning an aqueous solution of formic acid? HCO2H(aq) + H2O(l)  ?  H3O+(aq) + HCO2?(aq)  Ka = 1.8 × 10?4

Accepted Answer

A)  The reaction between formic acid and water is slow,due to the low value for Ka.
B)  A formic acid solution predominantly contains undissociated HCO2H molecules.
C)  A formic acid solution predominantly contains H3O+ and HCO2? ions.
D)  A formic acid solution contains a greater concentration of dissolved ions than it does neutral formic acid molecules.
E)  A formic acid solution contains equal amounts of H3O+ and HCO2H.

Question 17

Consider the following generalized buffer solution equilibrium: BH+(aq) + H2O(l)  ?  H3O+(aq) + B(aq) 
When a small amount of a strong base such as sodium hydroxide is added to the solution,which of the four species shown would experience an increase in concentration? (Hint: Use LeChatelier's principle.)

Accepted Answer

A)  BH+
B)  H2O
C)  H3O+
D)  B
E)  None of the species would increase in concentration.

Question 18

Choose the best classification of the reaction represented by the following equation: C6H12O6(s) + 6O2(g) → 6CO2(g) + 6H2O(l)

Accepted Answer

A)  combustion
B)  acid-base
C)  precipitation
D)  decomposition
E)  combination

Question 19

A standard solution is a solution whose concentration is accurately known.

Accepted Answer

A) True 
 B)False

Question 20

What is the hydronium ion concentration of a solution with a pH of 6.0?

Accepted Answer

A)  1 × 106 M
B)  1 × 10−6 M
C)  6 × 101 M
D)  6 × 10−1 M
E)  6 × 10−14 M

Exam 8: Acids and Bases

A buffer solution contains acetic acid (HC₂H₃O₂) at a concentration of 0.225 M and sodium acetate (NaC₂H₃O₂) at a concentration of 0.164 M.The value of K_a for acetic acid is 1.75 × 10⁻⁵.What is the pH of this buffer solution?

Correct Answer
verified

Consider two beakers,one containing 1.0 M HCl and the other containing 1.0 M CH₃COOH.Which solution would have the lowest pH?

Correct Answer
verified

A buffer solution is prepared by placing twice the concentration of propanoic acid (C₂H₅COOH,K_a=1.34 ×10⁻⁵) as the concentration of its conjugate base sodium propanoate into a flask.The pH of the resulting buffer solution is best described as which of the following?

Correct Answer
verified

All buffer solutions operate at a pH at or near 7.

Correct Answer
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Formic acid (HCO₂H) is a weak acid found in the venom of bees and ant stings.Which of the following is an accurate statement concerning an aqueous solution of formic acid? HCO₂H(aq) + H₂O(l) ? H₃O⁺(aq) + HCO₂^?(aq) K_a = 1.8 × 10^?4

Correct Answer
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Choose the best classification of the reaction represented by the following equation: C₆H₁₂O₆(s) + 6O₂(g) → 6CO₂(g) + 6H₂O(l)

Correct Answer
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Which of the following correctly describes what is meant by the term neutralization?

Correct Answer
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A patient's urine sample gave a reading of pH = 8.2.What is the value of [H₃O+] in this solution?

Correct Answer
verified

Titration of 25.0 mL of an HCl solution of unknown concentration requires 14.8 mL of 0.100 M NaOH.What is the molar concentration of the HCl solution? NaOH(aq) + HCl(aq) → NaCl(aq) + H₂O(l)

Correct Answer
verified

For the reaction shown below,which of the following is a conjugate acid-base pair? C₅H₅N(aq) + H₂O(l) ? C₅H₅NH⁺(aq) + OH^?(aq)

Correct Answer
verified

The pH of a 12.0 M solution of HCl is 1.1.

Correct Answer
verified

If the hydronium ion concentration of an aqueous solution at 25°C is 5 × 10⁻⁶ M,what is the hydroxide ion concentration?

Correct Answer
verified

What is the hydronium ion concentration of a solution with a pH of 6.0?

Correct Answer
verified

Correct Answer
verified

A standard solution is a solution whose concentration is accurately known.

Correct Answer
verified

What is the [OH⁻] of a solution that has a pH = 10.95?

Correct Answer
verified

Which statement concerning the relative strength of acids is FALSE?

Correct Answer
verified

What is always a characteristic of a solution that contains a buffer?

Correct Answer
verified

Which of the following best represents the autoionization,or self-ionization,of water?

Correct Answer
verified

A solution containing a buffer has an initial pH of 8.78.If a student adds 5 drops of NaOH(aq) to this solution,what would be a reasonable pH for the resulting solution?

Correct Answer
verified

Exam 8: Acids and Bases

A buffer solution contains acetic acid (HC2H3O2) at a concentration of 0.225 M and sodium acetate (NaC2H3O2) at a concentration of 0.164 M.The value of Ka for acetic acid is 1.75 × 10−5.What is the pH of this buffer solution?

Correct AnswerverifiedShow Answer

Consider two beakers,one containing 1.0 M HCl and the other containing 1.0 M CH3COOH.Which solution would have the lowest pH?

Correct AnswerverifiedShow Answer

A buffer solution is prepared by placing twice the concentration of propanoic acid (C2H5COOH,Ka=1.34 ×10−5) as the concentration of its conjugate base sodium propanoate into a flask.The pH of the resulting buffer solution is best described as which of the following?

Correct AnswerverifiedShow Answer

All buffer solutions operate at a pH at or near 7.

Correct AnswerverifiedShow Answer

Formic acid (HCO2H) is a weak acid found in the venom of bees and ant stings.Which of the following is an accurate statement concerning an aqueous solution of formic acid? HCO2H(aq) + H2O(l) ? H3O+(aq) + HCO2?(aq) Ka = 1.8 × 10?4

Correct AnswerverifiedShow Answer

Choose the best classification of the reaction represented by the following equation: C6H12O6(s) + 6O2(g) → 6CO2(g) + 6H2O(l)

Correct AnswerverifiedShow Answer

Which of the following correctly describes what is meant by the term neutralization?

Correct AnswerverifiedShow Answer

A patient's urine sample gave a reading of pH = 8.2.What is the value of [H3O+] in this solution?

Correct AnswerverifiedShow Answer

Titration of 25.0 mL of an HCl solution of unknown concentration requires 14.8 mL of 0.100 M NaOH.What is the molar concentration of the HCl solution? NaOH(aq) + HCl(aq) → NaCl(aq) + H2O(l)

Correct AnswerverifiedShow Answer

For the reaction shown below,which of the following is a conjugate acid-base pair? C5H5N(aq) + H2O(l) ? C5H5NH+(aq) + OH?(aq)

Correct AnswerverifiedShow Answer

The pH of a 12.0 M solution of HCl is 1.1.

Correct AnswerverifiedShow Answer

If the hydronium ion concentration of an aqueous solution at 25°C is 5 × 10−6 M,what is the hydroxide ion concentration?

Correct AnswerverifiedShow Answer

What is the hydronium ion concentration of a solution with a pH of 6.0?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A standard solution is a solution whose concentration is accurately known.

Correct AnswerverifiedShow Answer

What is the [OH−] of a solution that has a pH = 10.95?

Correct AnswerverifiedShow Answer

Which statement concerning the relative strength of acids is FALSE?

Correct AnswerverifiedShow Answer

What is always a characteristic of a solution that contains a buffer?

Correct AnswerverifiedShow Answer

Which of the following best represents the autoionization,or self-ionization,of water?

Correct AnswerverifiedShow Answer

A solution containing a buffer has an initial pH of 8.78.If a student adds 5 drops of NaOH(aq) to this solution,what would be a reasonable pH for the resulting solution?

Correct AnswerverifiedShow Answer

A buffer solution contains acetic acid (HC₂H₃O₂) at a concentration of 0.225 M and sodium acetate (NaC₂H₃O₂) at a concentration of 0.164 M.The value of K_a for acetic acid is 1.75 × 10⁻⁵.What is the pH of this buffer solution?

Correct Answer
verified

Consider two beakers,one containing 1.0 M HCl and the other containing 1.0 M CH₃COOH.Which solution would have the lowest pH?

Correct Answer
verified

A buffer solution is prepared by placing twice the concentration of propanoic acid (C₂H₅COOH,K_a=1.34 ×10⁻⁵) as the concentration of its conjugate base sodium propanoate into a flask.The pH of the resulting buffer solution is best described as which of the following?

Correct Answer
verified

Correct Answer
verified

Formic acid (HCO₂H) is a weak acid found in the venom of bees and ant stings.Which of the following is an accurate statement concerning an aqueous solution of formic acid? HCO₂H(aq) + H₂O(l) ? H₃O⁺(aq) + HCO₂^?(aq) K_a = 1.8 × 10^?4

Correct Answer
verified

Choose the best classification of the reaction represented by the following equation: C₆H₁₂O₆(s) + 6O₂(g) → 6CO₂(g) + 6H₂O(l)

Correct Answer
verified

Correct Answer
verified

A patient's urine sample gave a reading of pH = 8.2.What is the value of [H₃O+] in this solution?

Correct Answer
verified

Titration of 25.0 mL of an HCl solution of unknown concentration requires 14.8 mL of 0.100 M NaOH.What is the molar concentration of the HCl solution? NaOH(aq) + HCl(aq) → NaCl(aq) + H₂O(l)

Correct Answer
verified

For the reaction shown below,which of the following is a conjugate acid-base pair? C₅H₅N(aq) + H₂O(l) ? C₅H₅NH⁺(aq) + OH^?(aq)

Correct Answer
verified

Correct Answer
verified

If the hydronium ion concentration of an aqueous solution at 25°C is 5 × 10⁻⁶ M,what is the hydroxide ion concentration?

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
verified

What is the [OH⁻] of a solution that has a pH = 10.95?

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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