Question 1

Identify the conjugate base of HCO3-.

Accepted Answer

A)  H2CO3 
B)  CO32- 
C)  OH- 
D)  CO2 
E)  CO 
A)  H2CO3 
B)  CO32- 
C)  OH- 
D)  CO2 
E)  CO

Question 2

Calculate the pH of a 0.011 M solution of NH4NO3. (Kb(NH3) = 1.8 x 10-5)

Accepted Answer

A)  5.21 
B)  5.41 
C)  5.61 
D)  5.81 
E)  None of the above 
A)  5.21 
B)  5.41 
C)  5.61 
D)  5.81 
E)  None of the above

Question 3

Morphine, C17H19NO3, is often used to control severe post-operative pain. What is the pH of the solution made by dissolving 25.0 mg of morphine in 100. mL of water? (For morphine, Kb = 1.62 * 10-6.)

Accepted Answer

A)  9.57 
B)  9.08 
C)  3.79 
D)  9.87 
E)  4.43 
A)  9.57 
B)  9.08 
C)  3.79 
D)  9.87 
E)  4.43

Question 4

In the reaction CaO(s) + SO2(g) $\leftrightharpoons$ CaSO3(s),

Accepted Answer

A)  O2- acts as a Lewis base, and SO2 acts as a Lewis acid. 
B)  Ca2+ acts as a Lewis base, and SO42- acts as a Lewis acid. 
C)  SO42- acts as a Lewis base, and SO2 acts as a Lewis acid. 
D)  SO2 acts as a Lewis base, and O2- acts as a Lewis acid. 
E)  SO2 acts as a Lewis base, and Ca2+ acts as a Lewis acid. 
A)  O2- acts as a Lewis base, and SO2 acts as a Lewis acid. 
B)  Ca2+ acts as a Lewis base, and SO42- acts as a Lewis acid. 
C)  SO42- acts as a Lewis base, and SO2 acts as a Lewis acid. 
D)  SO2 acts as a Lewis base, and O2- acts as a Lewis acid. 
E)  SO2 acts as a Lewis base, and Ca2+ acts as a Lewis acid.

Question 5

Identify the conjugate base of HPO42-.

Accepted Answer

A)  H2O 
B)  H2PO4- 
C)  H3PO4 
D)  PO43- 
E)  OH- 
A)  H2O 
B)  H2PO4- 
C)  H3PO4 
D)  PO43- 
E)  OH-

Question 6

Write the chemical formula for the acid formed when Cl2O7 is dissolved in water.

Accepted Answer

A)  HClO 
B)  HClO2 
C)  HClO3 
D)  HClO4 
E)  None of the above 
A)  HClO 
B)  HClO2 
C)  HClO3 
D)  HClO4 
E)  None of the above

Question 7

Which of the following does not fit the definition of a Brønsted Base

Accepted Answer

A)  CO32- 
B)  NH3 
C)  H2O 
D)  NH4+ 
E)  HCO3- 
A)  CO32- 
B)  NH3 
C)  H2O 
D)  NH4+ 
E)  HCO3-

Question 8

What is the pH of a 0.014 M Ca(OH)2 solution

Accepted Answer

A)  1.85 
B)  1.55 
C)  12.15 
D)  12.45 
E)  15.85 
A)  1.85 
B)  1.55 
C)  12.15 
D)  12.45 
E)  15.85

Question 9

Calculate the pH of a 0.025 M solution of NaNO2. (Ka(HNO2) = 4.5 x 10-4)

Accepted Answer

A)  7.27 
B)  7.47 
C)  7.67 
D)  7.87 
E)  None of the above 
A)  7.27 
B)  7.47 
C)  7.67 
D)  7.87 
E)  None of the above

Question 10

Which one of these equations represents the reaction of a weak acid with a weak base

Accepted Answer

A) H+(aq) + OH-(aq) $\rarr$ H2O(aq) 
B) H+(aq) + CH3NH2(aq) $\rarr$ CH3NH3+(aq) 
C) OH-(aq) + HCN(aq) $\rarr$ H2O(aq) + CN-(aq) 
D) HCN(aq) + CH3NH2(aq) $\rarr$CH3NH3+(aq) + CN-(aq) 
A) H+(aq) + OH-(aq) $\rarr$ H2O(aq) 
B) H+(aq) + CH3NH2(aq) $\rarr$ CH3NH3+(aq) 
C) OH-(aq) + HCN(aq) $\rarr$ H2O(aq) + CN-(aq) 
D) HCN(aq) + CH3NH2(aq) $\rarr$CH3NH3+(aq) + CN-(aq)

Question 11

The oxides CO2 and SO3 will form the following acids in water, respectively.

Accepted Answer

A)  H2CO3(aq) and H2SO3(aq) 
B)  H2CO3(aq) and H2SO4(aq) 
C)  H2CO2(aq) and H2SO3(aq) 
D)  H2CO2(aq) and H2SO4(aq) 
E)  HCOO-(aq) and H2SO3(aq) 
A)  H2CO3(aq) and H2SO3(aq) 
B)  H2CO3(aq) and H2SO4(aq) 
C)  H2CO2(aq) and H2SO3(aq) 
D)  H2CO2(aq) and H2SO4(aq) 
E)  HCOO-(aq) and H2SO3(aq)

Question 12

What is the pH of a solution prepared by mixing 50.0 mL of 0.300 M HCl with 450.0 mL of 0.400 M HIO3? [Ka(HIO3) = 1.6 * 10-1]

Accepted Answer

A)  1.52 
B)  0.80 
C)  0.72 
D)  0.89 
E)  0.66 
A)  1.52 
B)  0.80 
C)  0.72 
D)  0.89 
E)  0.66

Question 13

H3AsO3 is a stronger acid than H3AsO4.

Accepted Answer

A) True 
 B)False

Question 14

Given the following Ka values, which anion is the strongest base $\begin{array}{|l|l|}
\hline \text { Acid } & \mathrm{K}_{3} \
\hline \mathrm{H}_{2} \mathrm{CO}_{3} & 4.2 \times 10^{-7} \
\hline \mathrm{HCO}_{3}^{-} & 4.8 \times 10^{-11} \
\hline \mathrm{H}_{2} \mathrm{C}_{2} \mathrm{O}_{4} & 6.5 \times 10^{-2} \
\hline \mathrm{HC}_{2} \mathrm{O}_{4}^{-} & 6.1 \times 10^{-5} \
\hline \mathrm{H}_{2} \mathrm{PO}_{4}^{-} & 6.2 \times 10^{-8} \
\hline
\end{array}$

Accepted Answer

A)  HCO3- 
B)  CO32- 
C)  HC2O4- 
D)  C2O42- 
E)  HPO42- 
A)  HCO3- 
B)  CO32- 
C)  HC2O4- 
D)  C2O42- 
E)  HPO42-

Question 15

Predict the direction in which the equilibrium will lie for the reaction H3PO4 + NO3- $\leftrightharpoons$ H2PO4- + HNO3. Ka(H3PO4) = 7.5 * 10-3

Accepted Answer

A)  to the right 
B)  to the left 
C)  in the middle 
A)  to the right 
B)  to the left 
C)  in the middle

Question 16

Arrange the acids H2Se, H2Te, and H2S in order of increasing acid strength.

Accepted Answer

A)  H2S 2Se 2Te 
B)  H2S 2Te 2Se 
C)  H2Te 2S 2Se 
D)  H2Se 2S 2Te 
E)  H2Se 2Te 2S 
A)  H2S 2Se 2Te 
B)  H2S 2Te 2Se 
C)  H2Te 2S 2Se 
D)  H2Se 2S 2Te 
E)  H2Se 2Te 2S

Question 17

Calculate the pH of a 0.20 M solution of NH4NO3. (Kb(NH3) = 1.8 x 10-5)

Accepted Answer

A)  0.69 
B)  4.74 
C)  2.72 
D)  4.98 
E)  9.02 
A)  0.69 
B)  4.74 
C)  2.72 
D)  4.98 
E)  9.02

Question 18

A 0.1 M solution of NH4CN(aq) will be acidic.

Accepted Answer

A) True 
 B)False

Question 19

Arrange the acids HOCl, HClO3, and HClO2 in order of increasing acid strength.

Accepted Answer

A)  HOCl 3 2 
B)  HOCl 2 3 
C)  HClO2 3 
D)  HClO3 2 
E)  HClO3 2 < HOCl 
A)  HOCl 3 2 
B)  HOCl 2 3 
C)  HClO2 3 
D)  HClO3 2 
E)  HClO3 2 < HOCl

Question 20

In the reaction: 2H2O(l) $\leftrightharpoons$ H3O+(aq) + OH- (aq) the conjugate acid-base pairs are

Accepted Answer

A)  pair 1: H2O and H2O; pair 2: H3O+ and OH- 
B)  pair 1: H3O+ and OH-; pair 2: H3O+ and H2O 
C)  pair 1: H3O+ and OH-; pair 2: OH- and H2O 
D)  pair 1: H2O and OH-; pair 2: H2O and H3O+ 
E)  pair 1: H3O+ and HO-: pair 2: OH- and H3O+ 
A)  pair 1: H2O and H2O; pair 2: H3O+ and OH- 
B)  pair 1: H3O+ and OH-; pair 2: H3O+ and H2O 
C)  pair 1: H3O+ and OH-; pair 2: OH- and H2O 
D)  pair 1: H2O and OH-; pair 2: H2O and H3O+ 
E)  pair 1: H3O+ and HO-: pair 2: OH- and H3O+

Exam 15: Acids and Bases

Identify the conjugate base of HCO3-.

Calculate the pH of a 0.011 M solution of NH4NO3. (Kb(NH3) = 1.8 x 10-5)

Morphine, C17H19NO3, is often used to control severe post-operative pain. What is the pH of the solution made by dissolving 25.0 mg of morphine in 100. mL of water? (For morphine, Kb = 1.62 * 10-6.)

In the reaction CaO(s) + SO2(g) ⇋\leftrightharpoons⇋ CaSO3(s),

Identify the conjugate base of HPO42-.

Write the chemical formula for the acid formed when Cl2O7 is dissolved in water.

Which of the following does not fit the definition of a Brønsted Base

What is the pH of a 0.014 M Ca(OH)2 solution

Calculate the pH of a 0.025 M solution of NaNO2. (Ka(HNO2) = 4.5 x 10-4)

Which one of these equations represents the reaction of a weak acid with a weak base

The oxides CO2 and SO3 will form the following acids in water, respectively.

What is the pH of a solution prepared by mixing 50.0 mL of 0.300 M HCl with 450.0 mL of 0.400 M HIO3? [Ka(HIO3) = 1.6 * 10-1]

H3AsO3 is a stronger acid than H3AsO4.

Given the following Ka values, which anion is the strongest base Acid 4.2\times1 4.8\times1 6.5\times1 6.1\times1 6.2\times1

Predict the direction in which the equilibrium will lie for the reaction H3PO4 + NO3- ⇋\leftrightharpoons⇋ H2PO4- + HNO3. Ka(H3PO4) = 7.5 * 10-3

Arrange the acids H2Se, H2Te, and H2S in order of increasing acid strength.

Calculate the pH of a 0.20 M solution of NH4NO3. (Kb(NH3) = 1.8 x 10-5)

A 0.1 M solution of NH4CN(aq) will be acidic.

Arrange the acids HOCl, HClO3, and HClO2 in order of increasing acid strength.

In the reaction: 2H2O(l) ⇋\leftrightharpoons⇋ H3O+(aq) + OH- (aq) the conjugate acid-base pairs are

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Identify the conjugate base of HCO₃^-.

Calculate the pH of a 0.011 M solution of NH₄NO₃. (K_b(NH₃) = 1.8 x 10^-5)

Morphine, C₁₇H₁₉NO₃, is often used to control severe post-operative pain. What is the pH of the solution made by dissolving 25.0 mg of morphine in 100. mL of water? (For morphine, K_b = 1.62 * 10^-6.)

In the reaction CaO(s) + SO₂(g) $\leftrightharpoons$ CaSO₃(s),

Identify the conjugate base of HPO₄^2-.

Write the chemical formula for the acid formed when Cl₂O₇ is dissolved in water.

What is the pH of a 0.014 M Ca(OH)₂ solution

Calculate the pH of a 0.025 M solution of NaNO₂. (K_a(HNO₂) = 4.5 x 10^-4)

The oxides CO₂ and SO₃ will form the following acids in water, respectively.

What is the pH of a solution prepared by mixing 50.0 mL of 0.300 M HCl with 450.0 mL of 0.400 M HIO₃? [K_a(HIO₃) = 1.6 * 10^-1]

H₃AsO₃ is a stronger acid than H₃AsO₄.

Given the following K_a values, which anion is the strongest base Acid 4.2\times1 4.8\times1 6.5\times1 6.1\times1 6.2\times1

Predict the direction in which the equilibrium will lie for the reaction H₃PO₄ + NO₃^- $\leftrightharpoons$ H₂PO₄^- + HNO₃. K_a(H₃PO₄) = 7.5 * 10^-3

Arrange the acids H₂Se, H₂Te, and H₂S in order of increasing acid strength.

Calculate the pH of a 0.20 M solution of NH₄NO₃. (K_b(NH₃) = 1.8 x 10^-5)

A 0.1 M solution of NH₄CN(aq) will be acidic.

Arrange the acids HOCl, HClO₃, and HClO₂ in order of increasing acid strength.

In the reaction: 2H₂O(l) $\leftrightharpoons$ H₃O⁺(aq) + OH^- (aq) the conjugate acid-base pairs are