Question 1

The Ka for formic acid (HCO2H)is 1.8 × 10-4. What is the pH of a 0.20 M aqueous solution of sodium formate (NaHCO2)?

Accepted Answer

A) 11.64 
B) 5.48 
C) 3.39 
D) 8.52 
E) 4.26 
A) 11.64 
B) 5.48 
C) 3.39 
D) 8.52 
E) 4.26

Question 2

Which solution below has the highest concentration of hydronium ions?

Accepted Answer

A) pH = 3.0 
B) pH = 10 
C) pH = 7.0 
D) pH = 6.4 
E) pH = 11.2 
A) pH = 3.0 
B) pH = 10 
C) pH = 7.0 
D) pH = 6.4 
E) pH = 11.2

Question 3

Using the data in the table, which of the conjugate bases below is the strongest base?

Accepted Answer

A) OAc- 
B) C7H5O2- 
C) NO2- 
D) F- 
E) OAc- and C7H5O2- 
A) OAc- 
B) C7H5O2- 
C) NO2- 
D) F- 
E) OAc- and C7H5O2-

Question 4

The molar concentration of hydroxide ion in pure water at 25 °C is ________.

Accepted Answer

A) 1.00 
B) 0.00 
C) 1.0 × 10-14 
D) 1.0 × 10-7 
E) 7.00 
A) 1.00 
B) 0.00 
C) 1.0 × 10-14 
D) 1.0 × 10-7 
E) 7.00

Question 5

Calculate the pH of 0.726 M anilinium hydrochloride (C6H5NH3Cl)solution in water, given that Kb for aniline is 3.83 × 10-4.

Accepted Answer

A) 1.78 
B) 12.22 
C) 5.36 
D) 8.64 
E) 12.42 
A) 1.78 
B) 12.22 
C) 5.36 
D) 8.64 
E) 12.42

Question 6

The Ka of hypochlorous acid (HClO)is 3.00 × 10-8. What is the pH at 25.0 °C of an aqueous solution that is 0.0200 M in HClO?

Accepted Answer

A) +2.45 
B) -2.45 
C) -9.22 
D) +9.22 
E) +4.61 
A) +2.45 
B) -2.45 
C) -9.22 
D) +9.22 
E) +4.61

Question 7

Which one of the following is a Br∅nsted-Lowry acid?

Accepted Answer

A) (CH3)3NH+ 
B) CH3COOH 
C) HF 
D) HNO2 
E) all of the above 
A) (CH3)3NH+ 
B) CH3COOH 
C) HF 
D) HNO2 
E) all of the above

Question 8

A solution of formic acid is 3.0% dissociated at 25.0 °C. What is the original concentration (in M)of the formic acid solution? The Ka at 25.0 °C for formic acid is 1.8 × 10-4.

Accepted Answer

Question 9

In which of the following aqueous solutions does the weak acid exhibit the highest percentage ionization?

Accepted Answer

A) 0.01 M H2SO3 (Ka = 1.4 × 10-2) 
B) 0.01 M HCN (Ka = 6.2 × 10-10) 
C) 0.01 M H2CO3 (Ka = 4.5 × 10-7) 
D) 0.01 M HC3H5O2 (Ka = 1.3 × 10-5) 
E) 0.01 M HOCl (Ka = 3.5 × 10-8) 
A) 0.01 M H2SO3 (Ka = 1.4 × 10-2) 
B) 0.01 M HCN (Ka = 6.2 × 10-10) 
C) 0.01 M H2CO3 (Ka = 4.5 × 10-7) 
D) 0.01 M HC3H5O2 (Ka = 1.3 × 10-5) 
E) 0.01 M HOCl (Ka = 3.5 × 10-8)

Question 10

A Lewis acid is an electron-pair acceptor, and a Lewis base is an electron-pair donor.

Accepted Answer

A) True 
 B)False

Question 11

Ka for HF is 7.0 × 10-4. Kb for the fluoride ion is ________.

Accepted Answer

A) 2.0 × 10-8 
B) 1.4 × 10-11 
C) 7.0 × 10-18 
D) 7.0 × 10-4 
E) 1.4 × 103 
A) 2.0 × 10-8 
B) 1.4 × 10-11 
C) 7.0 × 10-18 
D) 7.0 × 10-4 
E) 1.4 × 103

Question 12

In acidic solution, ________.

Accepted Answer

A) [H3O+] > [OH-] 
B) [H3O+] = [OH-] 
C) [H3O+] -] 
D) [OH-] > 7.00 
E) [H3O+] = 0M 
A) [H3O+] > [OH-] 
B) [H3O+] = [OH-] 
C) [H3O+] -] 
D) [OH-] > 7.00 
E) [H3O+] = 0M

Question 13

What is the concentration (in M)of hydronium ions in a solution at 25.0 °C with pH = 4.146?

Accepted Answer

A) 4.15 
B) 9.85 
C) 1.40 × 10-10 
D) 7.15 × 10-5 
E) none of the above 
A) 4.15 
B) 9.85 
C) 1.40 × 10-10 
D) 7.15 × 10-5 
E) none of the above

Question 14

A Br∅nsted-Lowry acid is defined as a substance that ________.

Accepted Answer

A) increases Ka when placed in H2O 
B) decreases [H+] when placed in H2O 
C) increases [OH-] when placed in H2O 
D) acts as a proton acceptor 
E) acts as a proton donor 
A) increases Ka when placed in H2O 
B) decreases [H+] when placed in H2O 
C) increases [OH-] when placed in H2O 
D) acts as a proton acceptor 
E) acts as a proton donor

Question 15

Which of the following acids will be the strongest?

Accepted Answer

A) H2SO4 
B) HSO4- 
C) H2SO3 
D) H2SeO4 
E) HSO3- 
A) H2SO4 
B) HSO4- 
C) H2SO3 
D) H2SeO4 
E) HSO3-

Question 16

Classify the following compounds as weak bases (W)or strong bases (S): methylamine carbonate ion potassium hydroxide

Accepted Answer

A) W W S 
B) S S S 
C) S W W 
D) W S S 
E) W S W 
A) W W S 
B) S S S 
C) S W W 
D) W S S 
E) W S W

Question 17

What is the pH of an aqueous solution at 25.0 °C in which [OH-] is 0.0030 M?

Accepted Answer

A) 5.81 
B) -11.48 
C) 2.52 
D) -2.52 
E) 11.48 
A) 5.81 
B) -11.48 
C) 2.52 
D) -2.52 
E) 11.48

Question 18

Using the data in the table, which of the conjugate acids below is the weakest acid?

Accepted Answer

A) NH4+ 
B) C5H5NH+ 
C) H3NOH+ 
D) NH3CH3+ 
E) NH4+ and NH3CH3+ 
A) NH4+ 
B) C5H5NH+ 
C) H3NOH+ 
D) NH3CH3+ 
E) NH4+ and NH3CH3+

Question 19

What is the pH of an aqueous solution at 25.0 °C that contains 3.98 × 10-9 M hydroxide ion?

Accepted Answer

A) 8.40 
B) 5.60 
C) 9.00 
D) 3.98 
E) 7.00 
A) 8.40 
B) 5.60 
C) 9.00 
D) 3.98 
E) 7.00

Question 20

Which one of the following is a Br∅nsted-Lowry base?

Accepted Answer

A) (CH3)3N 
B) CH3COOH 
C) HF 
D) HNO2 
E) none of the above 
A) (CH3)3N 
B) CH3COOH 
C) HF 
D) HNO2 
E) none of the above

Exam 16: Acid-Base Equilibria

The Ka for formic acid (HCO2H)is 1.8 × 10-4. What is the pH of a 0.20 M aqueous solution of sodium formate (NaHCO2)?

Which solution below has the highest concentration of hydronium ions?

Using the data in the table, which of the conjugate bases below is the strongest base?

The molar concentration of hydroxide ion in pure water at 25 °C is ________.

Calculate the pH of 0.726 M anilinium hydrochloride (C6H5NH3Cl)solution in water, given that Kb for aniline is 3.83 × 10-4.

The Ka of hypochlorous acid (HClO)is 3.00 × 10-8. What is the pH at 25.0 °C of an aqueous solution that is 0.0200 M in HClO?

Which one of the following is a Br∅nsted-Lowry acid?

A solution of formic acid is 3.0% dissociated at 25.0 °C. What is the original concentration (in M)of the formic acid solution? The Ka at 25.0 °C for formic acid is 1.8 × 10-4.

In which of the following aqueous solutions does the weak acid exhibit the highest percentage ionization?

A Lewis acid is an electron-pair acceptor, and a Lewis base is an electron-pair donor.

Ka for HF is 7.0 × 10-4. Kb for the fluoride ion is ________.

In acidic solution, ________.

What is the concentration (in M)of hydronium ions in a solution at 25.0 °C with pH = 4.146?

A Br∅nsted-Lowry acid is defined as a substance that ________.

Which of the following acids will be the strongest?

Classify the following compounds as weak bases (W)or strong bases (S): methylamine carbonate ion potassium hydroxide

What is the pH of an aqueous solution at 25.0 °C in which [OH-] is 0.0030 M?

Using the data in the table, which of the conjugate acids below is the weakest acid?

What is the pH of an aqueous solution at 25.0 °C that contains 3.98 × 10-9 M hydroxide ion?

Which one of the following is a Br∅nsted-Lowry base?

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The K_a for formic acid (HCO₂H)is 1.8 × 10^-4. What is the pH of a 0.20 M aqueous solution of sodium formate (NaHCO₂)?

Calculate the pH of 0.726 M anilinium hydrochloride (C₆H₅NH₃Cl)solution in water, given that K_b for aniline is 3.83 × 10^-4.

The K_a of hypochlorous acid (HClO)is 3.00 × 10^-⁸. What is the pH at 25.0 °C of an aqueous solution that is 0.0200 M in HClO?

A solution of formic acid is 3.0% dissociated at 25.0 °C. What is the original concentration (in M)of the formic acid solution? The K_a at 25.0 °C for formic acid is 1.8 × 10^-4.

K_a for HF is 7.0 × 10^-4. K_b for the fluoride ion is ________.

What is the pH of an aqueous solution at 25.0 °C in which [OH^-] is 0.0030 M?

What is the pH of an aqueous solution at 25.0 °C that contains 3.98 × 10^-9 M hydroxide ion?