Question 1

Which of the following pH values corresponds to a slightly basic solution?

Accepted Answer

A)  2.8 
B)  6.8 
C)  7.2 
D)  11.2 
A)  2.8 
B)  6.8 
C)  7.2 
D)  11.2 C

Question 2

Which of the following can be characterized as a strong base?

Accepted Answer

A)  0.001 M KOH 
B)  3.0 M KOH 
C)  both 0.001 M KOH and 3.0 M KOH 
D)  neither 0.001 M KOH or 3.0 M KOH 
A)  0.001 M KOH 
B)  3.0 M KOH 
C)  both 0.001 M KOH and 3.0 M KOH 
D)  neither 0.001 M KOH or 3.0 M KOH C

Question 3

The Ka of lactic acid is 8.4 × 10−4. What is the pKa of lactic acid?

Accepted Answer

A)  -10.92 
B)  -3.08 
C)  3.08 
D)  10.92 
A)  -10.92 
B)  -3.08 
C)  3.08 
D)  10.92 C

Question 4

Which of the following buffers will have the lowest pH?

Accepted Answer

A)  A solution containing 0.10 M HC2H3O2 and 0.10 M NaC2H3O2 will have the lowest pH. 
B)  A solution containing 0.20 M HC2H3O2 and 0.20 M NaC2H3O2 will have the lowest pH. 
C)  A solution containing 0.30 M HC2H3O2 and 0.30 M NaC2H3O2 will have the lowest pH. 
D)  They all will have the same pH. 
A)  A solution containing 0.10 M HC2H3O2 and 0.10 M NaC2H3O2 will have the lowest pH. 
B)  A solution containing 0.20 M HC2H3O2 and 0.20 M NaC2H3O2 will have the lowest pH. 
C)  A solution containing 0.30 M HC2H3O2 and 0.30 M NaC2H3O2 will have the lowest pH. 
D)  They all will have the same pH.

Question 5

Why does the label ammonium hydroxide (NH4OH) on a bottle give a false impression about the bottle's contents?

Accepted Answer

A)  There is a large amount of NH4+(aq) but only a small amount of OH−(aq). 
B)  There is a small amount of NH4+(aq) but a large amount of OH−(aq). 
C)  There is a large amount of NH3(aq) but only a small amount of OH−(aq). 
D)  None of these, the label accurately describes the contents. 
A)  There is a large amount of NH4+(aq) but only a small amount of OH−(aq). 
B)  There is a small amount of NH4+(aq) but a large amount of OH−(aq). 
C)  There is a large amount of NH3(aq) but only a small amount of OH−(aq). 
D)  None of these, the label accurately describes the contents.

Question 6

Which of the following is characteristic of a buffer?

Accepted Answer

A)  The pH will go down significantly when H3O+ is added to a buffer. 
B)  The pH will go down very slightly when H3O+ is added to a buffer. 
C)  The pH will go up significantly when H3O+ is added to a buffer. 
D)  The pH will go up very slightly when H3O+ is added to a buffer. 
A)  The pH will go down significantly when H3O+ is added to a buffer. 
B)  The pH will go down very slightly when H3O+ is added to a buffer. 
C)  The pH will go up significantly when H3O+ is added to a buffer. 
D)  The pH will go up very slightly when H3O+ is added to a buffer.

Question 7

Which of the following is true of the end point of an acid-base titration?

Accepted Answer

A)  It is the point where equal volumes of acid and base have been used. 
B)  It is the point where the acid and base have been added in proper stoichiometric amounts. 
C)  It is the point where a pH indicator changes color. 
D)  None of these is true. 
A)  It is the point where equal volumes of acid and base have been used. 
B)  It is the point where the acid and base have been added in proper stoichiometric amounts. 
C)  It is the point where a pH indicator changes color. 
D)  None of these is true.

Question 8

The pKa of lactic acid is 3.86. What is the pH of a buffer in which the lactic acid concentration is 2.0 M and the sodium lactate concentration is 0.50 M?

Accepted Answer

A)  2.86 
B)  3.26 
C)  4.46 
D)  4.86 
A)  2.86 
B)  3.26 
C)  4.46 
D)  4.86

Question 9

The pKa of acetic acid (HC2H3O2) is 4.75. What is the pH of a buffer in which [HC2H3O2] = 0.20 M and [NaC2H3O2] = 2.0 M?

Accepted Answer

A)  3.75 
B)  4.75 
C)  5.75 
D)  7.00 
A)  3.75 
B)  4.75 
C)  5.75 
D)  7.00

Question 10

Which of the following is true of a neutralization reaction?

Accepted Answer

A)  The product has acidic properties. 
B)  The product has basic properties. 
C)  The product has neither acidic nor basic properties. 
D)  The product has weakly acidic properties. 
A)  The product has acidic properties. 
B)  The product has basic properties. 
C)  The product has neither acidic nor basic properties. 
D)  The product has weakly acidic properties.

Question 11

Which of the following is true of the position of the equilibrium established when acetic acid is dissolved in water as represented below? CH3COOH(aq) + H2O ⇋ CH3COO−(aq) + H3O+(aq)

Accepted Answer

A)  It lies to the left as the weaker acid and the weaker base are present on the left. 
B)  It lies to the left as the stronger acid and the stronger base are present on the left. 
C)  It lies to the right as the weaker acid and the weaker base are present on the right. 
D)  It lies to the right as the stronger acid and the stronger base are present on the right. 
A)  It lies to the left as the weaker acid and the weaker base are present on the left. 
B)  It lies to the left as the stronger acid and the stronger base are present on the left. 
C)  It lies to the right as the weaker acid and the weaker base are present on the right. 
D)  It lies to the right as the stronger acid and the stronger base are present on the right.

Question 12

Which of the following can be characterized as a strong acid?

Accepted Answer

A)  0.001 M HCl 
B)  3.0 M CH3COOH 
C)  both 0.001 M HCI and 3.0 M CH3COOH 
D)  neither 0.001 M HCI or 3.0 M CH3COOH 
A)  0.001 M HCl 
B)  3.0 M CH3COOH 
C)  both 0.001 M HCI and 3.0 M CH3COOH 
D)  neither 0.001 M HCI or 3.0 M CH3COOH

Question 13

Which of the following occurs when the weak base ammonia (NH3) is dissolved in water?

Accepted Answer

A)  Ammonia molecules react with water to form Na+(aq) and OH−(aq). 
B)  Ammonia molecules react with water to form NH4+(aq) and OH−(aq). 
C)  Ammonia molecules react with water to form H3O+(aq) and NO2−(aq). 
D)  Ammonia molecules react with water to form H3O+(aq) and Na+(aq). 
A)  Ammonia molecules react with water to form Na+(aq) and OH−(aq). 
B)  Ammonia molecules react with water to form NH4+(aq) and OH−(aq). 
C)  Ammonia molecules react with water to form H3O+(aq) and NO2−(aq). 
D)  Ammonia molecules react with water to form H3O+(aq) and Na+(aq).

Question 14

What is the reaction between an acid and a base known as?

Accepted Answer

A)  neutralization 
B)  precipitation 
C)  redox 
D)  single displacement 
A)  neutralization 
B)  precipitation 
C)  redox 
D)  single displacement

Question 15

What type of reaction occurs in the stomach when an antacid is consumed to relieve heartburn caused by excess stomach acidity?

Accepted Answer

A)  double displacement 
B)  neutralization 
C)  precipitation 
D)  redox 
A)  double displacement 
B)  neutralization 
C)  precipitation 
D)  redox

Question 16

Which of the following pH values corresponds to a highly acidic solution?

Accepted Answer

A)  2.8 
B)  6.8 
C)  7.2 
D)  11.2 
A)  2.8 
B)  6.8 
C)  7.2 
D)  11.2

Question 17

Which of the following is a cause of alkalosis?

Accepted Answer

A)  a poor diet 
B)  hyperventilation 
C)  hypoventilation 
D)  intense exercise 
A)  a poor diet 
B)  hyperventilation 
C)  hypoventilation 
D)  intense exercise

Question 18

Given the following information, which of these acids is the strongest? Ka of boric acid is 7.3 × 10−10.
PKa of acetic acid is 4.75.
Ka of lactic acid is 8.4 × 10−4.
PKa of phenol is 9.89.

Accepted Answer

A)  acetic acid 
B)  formic acid 
C)  lactic acid 
D)  phenol 
A)  acetic acid 
B)  formic acid 
C)  lactic acid 
D)  phenol

Question 19

Which of the following is the conjugate base of H3PO4?

Accepted Answer

A)  H2PO4− 
B)  HPO42− 
C)  PO43− 
D)  OH− 
A)  H2PO4− 
B)  HPO42− 
C)  PO43− 
D)  OH−

Question 20

The pKa of lactic acid is 3.86. What is the pH of a buffer in which the lactic acid concentration is 0.20 M and the sodium lactate concentration is 2.0 M?

Accepted Answer

A)  2.86 
B)  3.86 
C)  4.86 
D)  7.00 
A)  2.86 
B)  3.86 
C)  4.86 
D)  7.00

Exam 8: Acids and Bases

Which of the following pH values corresponds to a slightly basic solution?

Which of the following can be characterized as a strong base?

The Ka of lactic acid is 8.4 × 10−4. What is the pKa of lactic acid?

Which of the following buffers will have the lowest pH?

Why does the label ammonium hydroxide (NH4OH) on a bottle give a false impression about the bottle's contents?

Which of the following is characteristic of a buffer?

Which of the following is true of the end point of an acid-base titration?

The pKa of lactic acid is 3.86. What is the pH of a buffer in which the lactic acid concentration is 2.0 M and the sodium lactate concentration is 0.50 M?

The pKa of acetic acid (HC2H3O2) is 4.75. What is the pH of a buffer in which [HC2H3O2] = 0.20 M and [NaC2H3O2] = 2.0 M?

Which of the following is true of a neutralization reaction?

Which of the following is true of the position of the equilibrium established when acetic acid is dissolved in water as represented below? CH3COOH(aq) + H2O ⇋ CH3COO−(aq) + H3O+(aq)

Which of the following can be characterized as a strong acid?

Which of the following occurs when the weak base ammonia (NH3) is dissolved in water?

What is the reaction between an acid and a base known as?

What type of reaction occurs in the stomach when an antacid is consumed to relieve heartburn caused by excess stomach acidity?

Which of the following pH values corresponds to a highly acidic solution?

Which of the following is a cause of alkalosis?

Given the following information, which of these acids is the strongest? Ka of boric acid is 7.3 × 10−10. PKa of acetic acid is 4.75. Ka of lactic acid is 8.4 × 10−4. PKa of phenol is 9.89.

Which of the following is the conjugate base of H3PO4?

The pKa of lactic acid is 3.86. What is the pH of a buffer in which the lactic acid concentration is 0.20 M and the sodium lactate concentration is 2.0 M?

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The K_a of lactic acid is 8.4 × 10⁻⁴. What is the pK_a of lactic acid?

Why does the label ammonium hydroxide (NH₄OH) on a bottle give a false impression about the bottle's contents?

The pK_a of lactic acid is 3.86. What is the pH of a buffer in which the lactic acid concentration is 2.0 M and the sodium lactate concentration is 0.50 M?

The pK_a of acetic acid (HC₂H₃O₂) is 4.75. What is the pH of a buffer in which [HC₂H₃O₂] = 0.20 M and [NaC₂H₃O₂] = 2.0 M?

Which of the following is true of the position of the equilibrium established when acetic acid is dissolved in water as represented below? CH₃COOH(aq) + H₂O ⇋ CH₃COO⁻(aq) + H₃O⁺(aq)

Which of the following occurs when the weak base ammonia (NH₃) is dissolved in water?

Given the following information, which of these acids is the strongest? K_a of boric acid is 7.3 × 10⁻¹⁰. PK_a of acetic acid is 4.75. K_a of lactic acid is 8.4 × 10⁻⁴. PK_a of phenol is 9.89.

Which of the following is the conjugate base of H₃PO₄?

The pK_a of lactic acid is 3.86. What is the pH of a buffer in which the lactic acid concentration is 0.20 M and the sodium lactate concentration is 2.0 M?