Question 1

Match the type of compound with the biological environment into which it is most likely to partition.
-Weak acid

Accepted Answer

A)   Bloodstream
B)   Lipid membrane

Question 2

Given the pKa for ammonium ion is 9.26, what is the pH of 1 L of
Solution which contains 5.35 g of NH4Cl, and contains the ammonium ion at a concentration of 0.2 mol L-1? (Molar mass of NH4Cl = 54.5 g mol-1.)

Accepted Answer

A)   7.00
B)   7.65
C)   8.96
D)   9.56
E)   9.95

Question 3

Which of the following depicts a neutralization reaction?

Accepted Answer

A)   CH3CH2COOH ⇌ CH3CH2COO- + H+
B)   CH3CH2COOH + NaOH  CH3CH2COONa + H2O
C)   CH3CH2COOH + CH3OH  CH3CH2COOCH3 + H2O
D)   CH3CH2COOH + H2O ⇌ CH3CH2COO- + H3O+

Question 4

Which of the following statements about buffer solutions are true? Select any that apply.

Accepted Answer

A)   A buffer solution must contain a strong acid.
B)   A buffer solution undergoes a neutralization reaction to consume excess OH- ions.
C)   The conjugate acid present in the buffer solution consumes excess H+ ions.
D)   The components of the buffer solution must be present at high concentrations.
E)   A buffer solution can only resist changes in pH when small quantities of an acid or base are added to it.

Question 5

Match the following amino acids with the most appropriate description of the extent of ionization of their side chains when the pH of their environment has a value of 10.0
-Lysine (pKa 10.5)

Accepted Answer

A)   Roughly 50% ionized
B)   Less than 50% ionized
C)   More than 50% ionized A

Question 6

Look at the following equilibrium reaction:
  Match each chemical species with the term that best describes its role in this reaction scheme.
-Base

Accepted Answer

A)   A
B)   B
C)   C
D)   D

Question 7

Which of the following acids would you use to make an effective buffer for a reaction at pH 8?

Accepted Answer

A)   Ethanoic acid; Ka = 1.7  10-5
B)   Diphosphoric acid; Ka = 1.4  10-7
C)   Tris-hydroxmethylaminoethane; Ka = 8.3  10-9
D)   Ammonium chloride; Ka = 5.6  10-10
E)   Sodium bicarbonate; Ka = 5.3  10-11

Question 8

Which one of the following is the correct expression for the ion product of water?

Accepted Answer

A)    log pOH" class="answers-bank-image d-inline" rel="preload" >
B)    log pOH" class="answers-bank-image d-inline" rel="preload" >
C)    log pOH" class="answers-bank-image d-inline" rel="preload" >
D)    log pOH" class="answers-bank-image d-inline" rel="preload" >
E)   log pH  log pOH

Question 9

A solution of HCl at concentration of 4  10-4 mol L-1 has a pH of which of the following?

Accepted Answer

A)   2.67
B)   3.21
C)   3.40
D)   4.31
E)   4.0

Question 10

The pH of human blood is 7.4. Therefore the hydrogen ion concentration in human blood is which of the following?

Accepted Answer

A)   7.4 M
B)   2.5  107 M
C)   1.6  103 M
D)   4.0  10-8 M
E)   7.4  10-7 M

Question 11

Which of the following is the weakest acid?

Accepted Answer

A)   Boric acid, Ka = 7.3  10-10
B)   Benzoic acid, Ka = 6.3  10-5
C)   Sulfurous acid, Ka = 1.2  10-2
D)   Ethanoic acid, Ka = 1.8  10-5
E)   Formic acid, Ka = 1.8  10-4

Question 12

Look at the following equilibrium reaction:
  Match each chemical species with the term that best describes its role in this reaction scheme.
-Acid

Accepted Answer

A)   A
B)   B
C)   C
D)   D

Question 13

If the concentration of [OH-] in an aqueous solution is 0.3 M, what is the pH of that solution?

Accepted Answer

A)   8.96
B)   10.87
C)   1.45
D)   3.67
E)   13.48

Question 14

Which of the following reactions depict the behaviour of an acid? Select any that apply.

Accepted Answer

A)   NH3 + H+ ⇌ NH4+
B)   CH3OOH- + ⇌CH3COOH
C)   CH3COOH ⇌ CH3COO- + H+
D)   H2O ⇌ H+ + OH-
E)   H2O + H+ ⇌ H3O+

Question 15

A 0.1 M solution of ethanoic acid is 1.34% ionized. What is the value of Ka for ethanoic acid?

Accepted Answer

A)   Ka = 5.3  10-11
B)   Ka = 1.82  10-5
C)   Ka = 1.34  10-6
D)   Ka = 2.67  10-2
E)   Ka = 3.01  10-4 B

Question 16

Match the type of compound with the biological environment into which it is most likely to partition.
-Strong acid

Accepted Answer

A)   Bloodstream
B)   Lipid membrane

Question 17

Match the following amino acids with the most appropriate description of the extent of ionization of their side chains when the pH of their environment has a value of 10.0
-Arginine (pKa 12.5)

Accepted Answer

A)   Roughly 50% ionized
B)   Less than 50% ionized
C)   More than 50% ionized

Question 18

The pH of a 0.005 M solution of hydrobromic acid is which of the following?

Accepted Answer

A)   1.3
B)   2.1
C)   2.3
D)   2.0
E)   5.0 C

Question 19

Match the following amino acids with the most appropriate description of the extent of ionization of their side chains when the pH of their environment has a value of 10.0
-Glutamic acid (pKa 4.1)

Accepted Answer

A)   Roughly 50% ionized
B)   Less than 50% ionized
C)   More than 50% ionized

Question 20

Look at the following equilibrium reaction:
  Match each chemical species with the term that best describes its role in this reaction scheme.
-Conjugate acid

Accepted Answer

A)   A
B)   B
C)   C
D)   D

Exam 17: Acids, Bases, and Buffer Solutions: Life in an Aqueous Environment

Match the type of compound with the biological environment into which it is most likely to partition. -Weak acid

Correct AnswerverifiedShow Answer

Given the pKa for ammonium ion is 9.26, what is the pH of 1 L of Solution which contains 5.35 g of NH4Cl, and contains the ammonium ion at a concentration of 0.2 mol L-1? (Molar mass of NH4Cl = 54.5 g mol-1.)

Correct AnswerverifiedShow Answer

Which of the following depicts a neutralization reaction?

Correct AnswerverifiedShow Answer

Which of the following statements about buffer solutions are true? Select any that apply.

Correct AnswerverifiedShow Answer

Match the following amino acids with the most appropriate description of the extent of ionization of their side chains when the pH of their environment has a value of 10.0 -Lysine (pKa 10.5)

Correct AnswerverifiedA

Look at the following equilibrium reaction: Match each chemical species with the term that best describes its role in this reaction scheme. -Base

Correct AnswerverifiedShow Answer

Which of the following acids would you use to make an effective buffer for a reaction at pH 8?

Correct AnswerverifiedShow Answer

Which one of the following is the correct expression for the ion product of water?

Correct AnswerverifiedShow Answer

A solution of HCl at concentration of 4  10-4 mol L-1 has a pH of which of the following?

Correct AnswerverifiedShow Answer

The pH of human blood is 7.4. Therefore the hydrogen ion concentration in human blood is which of the following?

Correct AnswerverifiedShow Answer

Which of the following is the weakest acid?

Correct AnswerverifiedShow Answer

Look at the following equilibrium reaction: Match each chemical species with the term that best describes its role in this reaction scheme. -Acid

Correct AnswerverifiedShow Answer

If the concentration of [OH-] in an aqueous solution is 0.3 M, what is the pH of that solution?

Correct AnswerverifiedShow Answer

Which of the following reactions depict the behaviour of an acid? Select any that apply.

Correct AnswerverifiedShow Answer

A 0.1 M solution of ethanoic acid is 1.34% ionized. What is the value of Ka for ethanoic acid?

Correct AnswerverifiedB

Match the type of compound with the biological environment into which it is most likely to partition. -Strong acid

Correct AnswerverifiedShow Answer

Match the following amino acids with the most appropriate description of the extent of ionization of their side chains when the pH of their environment has a value of 10.0 -Arginine (pKa 12.5)

Correct AnswerverifiedShow Answer

The pH of a 0.005 M solution of hydrobromic acid is which of the following?

Correct AnswerverifiedC

Match the following amino acids with the most appropriate description of the extent of ionization of their side chains when the pH of their environment has a value of 10.0 -Glutamic acid (pKa 4.1)

Correct AnswerverifiedShow Answer

Look at the following equilibrium reaction: Match each chemical species with the term that best describes its role in this reaction scheme. -Conjugate acid

Correct AnswerverifiedShow Answer

Correct Answer
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Given the pK_a for ammonium ion is 9.26, what is the pH of 1 L of Solution which contains 5.35 g of NH₄Cl, and contains the ammonium ion at a concentration of 0.2 mol L^-1? (Molar mass of NH₄Cl = 54.5 g mol^-1.)

Correct Answer
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Match the following amino acids with the most appropriate description of the extent of ionization of their side chains when the pH of their environment has a value of 10.0 -Lysine (pK_a 10.5)

Correct Answer
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A

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A solution of HCl at concentration of 4  10^-4 mol L^-1has a pH of which of the following?

Correct Answer
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If the concentration of [OH^-] in an aqueous solution is 0.3 M, what is the pH of that solution?

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A 0.1 M solution of ethanoic acid is 1.34% ionized. What is the value of K_a for ethanoic acid?

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B

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Match the following amino acids with the most appropriate description of the extent of ionization of their side chains when the pH of their environment has a value of 10.0 -Arginine (pK_a 12.5)

Correct Answer
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C

Match the following amino acids with the most appropriate description of the extent of ionization of their side chains when the pH of their environment has a value of 10.0 -Glutamic acid (pK_a 4.1)

Correct Answer
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