Question 1

What is the conjugate base of H2PO4-(aq)?

Accepted Answer

A) PO43- 
B) H3O+ 
C) HPO42- 
D) H3P 
E) H3PO4 
A) PO43- 
B) H3O+ 
C) HPO42- 
D) H3P 
E) H3PO4 C

Question 2

Which of the following is the strongest acid?

Accepted Answer

A) HClO2 
B) HCl 
C) HClO4 
D) HClO 
E) HClO3 
A) HClO2 
B) HCl 
C) HClO4 
D) HClO 
E) HClO3 C

Question 3

A solution has a hydroxide-ion concentration of 0.0040 M.What is the pOH of the solution?

Accepted Answer

A) 11.60 
B) 2.40 
C) 7.00 
D) 8.48 
E) 5.52 
A) 11.60 
B) 2.40 
C) 7.00 
D) 8.48 
E) 5.52 B

Question 4

In the reaction
CuO(s)+ CO2(g)→ CuCO3(s),

Accepted Answer

A) O2- acts as a Lewis base and CO2 acts as a Lewis acid. 
B) O2- acts as a Lewis base and Cu2+ acts as a Lewis acid. 
C) CuO is the Lewis acid and CuCO3 is its conjugate base. 
D) CO2 is the Lewis acid and CuCO3 is its conjugate base. 
E) Cu2+ acts as a Lewis acid and CO32- acts as a Lewis base. 
A) O2- acts as a Lewis base and CO2 acts as a Lewis acid. 
B) O2- acts as a Lewis base and Cu2+ acts as a Lewis acid. 
C) CuO is the Lewis acid and CuCO3 is its conjugate base. 
D) CO2 is the Lewis acid and CuCO3 is its conjugate base. 
E) Cu2+ acts as a Lewis acid and CO32- acts as a Lewis base.

Question 5

What is a conjugate acid-base pair for the following equilibrium?
H2O(l)+ HPO42-(aq)  
H2PO4-(aq)+ OH-(aq)

Accepted Answer

A) H2O is an acid and HPO42- is its conjugate base. 
B) HPO42- is an acid and OH- is its conjugate base. 
C) H2O is an acid and OH- is its conjugate base. 
D) HPO42- is an acid and H2PO4- is its conjugate base. 
E) HPO42- is an acid and H2O is its conjugate base. 
A) H2O is an acid and HPO42- is its conjugate base. 
B) HPO42- is an acid and OH- is its conjugate base. 
C) H2O is an acid and OH- is its conjugate base. 
D) HPO42- is an acid and H2PO4- is its conjugate base. 
E) HPO42- is an acid and H2O is its conjugate base.

Question 6

What is the pOH of a 0.0032 M CsOH solution?

Accepted Answer

A) 2.49 
B) 16.49 
C) 8.26 
D) 5.74 
E) 11.51 
A) 2.49 
B) 16.49 
C) 8.26 
D) 5.74 
E) 11.51

Question 7

Which of the following species cannot act as a Lewis base?

Accepted Answer

A) H2O2 
B) OH- 
C) O2- 
D) H2O 
E) Be2+ 
A) H2O2 
B) OH- 
C) O2- 
D) H2O 
E) Be2+

Question 8

What is the pOH of a 0.011 M HI solution?

Accepted Answer

A) 4.51 
B) 12.04 
C) 9.49 
D) 15.96 
E) 1.96 
A) 4.51 
B) 12.04 
C) 9.49 
D) 15.96 
E) 1.96

Question 9

In Arrhenius theory,a _____ completely ionizes in aqueous solution to give OH- and a cation.

Accepted Answer

A) ​strong acid 
B) ​strong base 
C) ​weak acid 
D) ​carborane 
E) ​weak base 
A) ​strong acid 
B) ​strong base 
C) ​weak acid 
D) ​carborane 
E) ​weak base

Question 10

In Arrhenius theory,a(n)_____ is a substance that completely ionizes in aqueous solution to give H3O+(aq)and an anion.

Accepted Answer

A) ​strong acid 
B) ​strong base 
C) ​weak acid 
D) ​alkali 
E) ​weak base 
A) ​strong acid 
B) ​strong base 
C) ​weak acid 
D) ​alkali 
E) ​weak base

Question 11

Which of the following species cannot act as a Lewis acid?

Accepted Answer

A) H+ 
B) H- 
C) K+ 
D) Mg2+ 
E) Al3+ 
A) H+ 
B) H- 
C) K+ 
D) Mg2+ 
E) Al3+

Question 12

Given equal concentrations of the following acids,which exhibits the greatest amount of ionization in water?

Accepted Answer

A) acetic acid 
B) sulfurous acid 
C) citric acid 
D) perchloric acid 
E) hypochlorous acid 
A) acetic acid 
B) sulfurous acid 
C) citric acid 
D) perchloric acid 
E) hypochlorous acid

Question 13

Rank H3PO4,H2PO4-,and HPO42- in order of increasing acid strength.

Accepted Answer

A) HPO42- 2PO4- 3PO4 
B) H2PO4- 42- 3PO4 
C) H2PO4- 3PO4 42- 
D) HPO42- 3PO4 2PO4- 
E) H3PO4 2PO4- 42- 
A) HPO42- 2PO4- 3PO4 
B) H2PO4- 42- 3PO4 
C) H2PO4- 3PO4 42- 
D) HPO42- 3PO4 2PO4- 
E) H3PO4 2PO4- 42-

Question 14

Which of the following species cannot act as a Lewis base?

Accepted Answer

A) H2S 
B) S2- 
C) Al3+ 
D) SH- 
E) H2O 
A) H2S 
B) S2- 
C) Al3+ 
D) SH- 
E) H2O

Question 15

The ionization constant of water at a temperature above 25°C is 3.5 × 10-14.What is the pH of pure water at this temperature?
2H2O(l)  
H3O+(aq)+ OH-(aq)

Accepted Answer

A) 7.73 
B) 5.53 
C) 6.73 
D) 13.49 
E) 7.00 
A) 7.73 
B) 5.53 
C) 6.73 
D) 13.49 
E) 7.00

Question 16

What pH should a solution have if its pH is about the same as that of vinegar?

Accepted Answer

A) about 8 
B) about 11 
C) about 1 
D) about 6 
E) about 3 
A) about 8 
B) about 11 
C) about 1 
D) about 6 
E) about 3

Question 17

The concentration of H3O+ in a solution is 6 × 10-4 M at 25°C.What is its hydroxide-ion concentration?

Accepted Answer

A) 6 × 10-4 M 
B) 1 × 10-10 M 
C) 2 × 10-10 M 
D) 3 × 10-10 M 
E) 2 × 10-11 M 
A) 6 × 10-4 M 
B) 1 × 10-10 M 
C) 2 × 10-10 M 
D) 3 × 10-10 M 
E) 2 × 10-11 M

Question 18

A solution has a hydronium-ion concentration of 0.0029 M.What is its pOH?

Accepted Answer

A) 2.54 
B) 16.54 
C) 8.16 
D) ​5.84 
E) 11.46 
A) 2.54 
B) 16.54 
C) 8.16 
D) ​5.84 
E) 11.46

Question 19

The pOH of a solution is 5.15.What is the pH of the solution?

Accepted Answer

A) 5.15 
B) 8.85 
C) 7.08 
D) 7.00 
E) 2.72 
A) 5.15 
B) 8.85 
C) 7.08 
D) 7.00 
E) 2.72

Question 20

Which of the following reactions is not readily explained by the Arrhenius concept of acids and bases?

Accepted Answer

A) HCl(g)+ NH3(g)→ NH4Cl(s) 
B) HCl(aq)+ NaOH(aq)→ NaCl(aq)+ H2O(l) 
C) HClO4(aq)+ H2O(l)→ H3O+(aq)+ ClO4−(aq) 
D) HC2H3O2(aq)+ H2O(l)   H3O+(aq)+ C2H3O2−(aq) 
E) H3O+(aq)+ OH−(aq)→ 2H2O(l) 
A) HCl(g)+ NH3(g)→ NH4Cl(s) 
B) HCl(aq)+ NaOH(aq)→ NaCl(aq)+ H2O(l) 
C) HClO4(aq)+ H2O(l)→ H3O+(aq)+ ClO4−(aq) 
D) HC2H3O2(aq)+ H2O(l)   H3O+(aq)+ C2H3O2−(aq) 
E) H3O+(aq)+ OH−(aq)→ 2H2O(l)

Exam 15: Acids and Bases

What is the conjugate base of H2PO4-(aq)?

Which of the following is the strongest acid?

A solution has a hydroxide-ion concentration of 0.0040 M.What is the pOH of the solution?

In the reaction CuO(s)+ CO2(g)→ CuCO3(s),

What is a conjugate acid-base pair for the following equilibrium? H2O(l)+ HPO42-(aq) H2PO4-(aq)+ OH-(aq)

What is the pOH of a 0.0032 M CsOH solution?

Which of the following species cannot act as a Lewis base?

What is the pOH of a 0.011 M HI solution?

In Arrhenius theory,a _____ completely ionizes in aqueous solution to give OH- and a cation.

In Arrhenius theory,a(n)_____ is a substance that completely ionizes in aqueous solution to give H3O+(aq)and an anion.

Which of the following species cannot act as a Lewis acid?

Given equal concentrations of the following acids,which exhibits the greatest amount of ionization in water?

Rank H3PO4,H2PO4-,and HPO42- in order of increasing acid strength.

Which of the following species cannot act as a Lewis base?

The ionization constant of water at a temperature above 25°C is 3.5 × 10-14.What is the pH of pure water at this temperature? 2H2O(l) H3O+(aq)+ OH-(aq)

What pH should a solution have if its pH is about the same as that of vinegar?

The concentration of H3O+ in a solution is 6 × 10-4 M at 25°C.What is its hydroxide-ion concentration?

A solution has a hydronium-ion concentration of 0.0029 M.What is its pOH?

The pOH of a solution is 5.15.What is the pH of the solution?

Which of the following reactions is not readily explained by the Arrhenius concept of acids and bases?

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Filters

What is the conjugate base of H₂PO₄^-(aq)?

In the reaction CuO(s)+ CO₂(g)→ CuCO₃(s),

What is a conjugate acid-base pair for the following equilibrium? H₂O(l)+ HPO₄^2-(aq) H₂PO₄^-(aq)+ OH^-(aq)

In Arrhenius theory,a _____ completely ionizes in aqueous solution to give OH^-and a cation.

In Arrhenius theory,a(n)_____ is a substance that completely ionizes in aqueous solution to give H₃O⁺(aq)and an anion.

Rank H₃PO₄,H₂PO₄^-,and HPO₄^2- in order of increasing acid strength.

The ionization constant of water at a temperature above 25°C is 3.5 × 10^-14.What is the pH of pure water at this temperature? 2H₂O(l) H₃O⁺(aq)+ OH^-(aq)

The concentration of H₃O⁺ in a solution is 6 × 10^-4 M at 25°C.What is its hydroxide-ion concentration?