Question 1

What is the pH of a 0.11 M solution of C6H5OH (Ka = 1.3 x 10-10)

Accepted Answer

A) 0.96 
B) 10.84 
C) 5.42 
D) 9.89 
E) 4.11 
A) 0.96 
B) 10.84 
C) 5.42 
D) 9.89 
E) 4.11

Question 2

Write the formula for the conjugate base of H2PO4-.

Accepted Answer

Question 3

A 5.5 L sample of a 0.25 M HNO3 solution is mixed with 1.2 L of a 0.34 M HCl solution.What is the pH of the mixture?

Accepted Answer

A) 0.23 
B) 0.57 
C) 1.07 
D) 0.50 
E) 0.84 
A) 0.23 
B) 0.57 
C) 1.07 
D) 0.50 
E) 0.84

Question 4

Will a 0.1 M solution of NH4NO2(aq)be acidic, basic, or neutral?

Accepted Answer

Question 5

Calculate the pH of a 6.7 × 10-2 M NaOH solution.

Accepted Answer

A) 12.83 
B) 2.17 
C) 11.82 
D) 6.71 
E) 1.17 
A) 12.83 
B) 2.17 
C) 11.82 
D) 6.71 
E) 1.17

Question 6

What is the pH of a solution prepared by mixing 100.mL of 0.0500 M HCl with 300.mL of 0.500 M HF? [Ka(HF)= 7.1 × 10-4]

Accepted Answer

A) 1.47 
B) 1.90 
C) 1.30 
D) 1.63 
E) 2.82 
A) 1.47 
B) 1.90 
C) 1.30 
D) 1.63 
E) 2.82

Question 7

The OH- concentration in a 7.5 × 10-3 M Ca(OH)2 solution is

Accepted Answer

A) 7.5 × 10-3 M. 
B) 1.5 × 10-2 M. 
C) 1.3 × 10-12 M. 
D) 1.0 × 10-7 M. 
E) 1.0 × 10-14 M. 
A) 7.5 × 10-3 M. 
B) 1.5 × 10-2 M. 
C) 1.3 × 10-12 M. 
D) 1.0 × 10-7 M. 
E) 1.0 × 10-14 M.

Question 8

Calculate the H+ ion concentration in lemon juice having a pH of 2.40.

Accepted Answer

A) 4.0 × 10-2 M 
B) 250 M 
C) 0.38 M 
D) 4.0 × 10-3 M 
E) 12 M 
A) 4.0 × 10-2 M 
B) 250 M 
C) 0.38 M 
D) 4.0 × 10-3 M 
E) 12 M

Question 9

Identify the conjugate acid of SO42-

Accepted Answer

A) H2SO4 
B) HSO4- 
C) H2SO3 
D) H3O+ 
E) SO32- 
A) H2SO4 
B) HSO4- 
C) H2SO3 
D) H3O+ 
E) SO32-

Question 10

Of the two acids HBr and H2Se, H2Se is the stronger acid.

Accepted Answer

A) True 
 B)False

Question 11

Which one of these net ionic equations represents the reaction of a strong 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 12

Calculate the pH of a 0.18 M solution of KNO2 (Ka (HNO2)= 4.5 x 10-4)

Accepted Answer

A) 5.70 
B) 8.30 
C) 2.05 
D) 11.95 
E) 9.91 
A) 5.70 
B) 8.30 
C) 2.05 
D) 11.95 
E) 9.91

Question 13

The pH of tomato juice is about 4.5.Calculate the concentration of hydrogen ions in this juice.

Accepted Answer

A) 3 × 10-10 M 
B) 3 × 10-5 M 
C) 5 × 10-4 M 
D) 4 M 
E) 3 × 1010 M 
A) 3 × 10-10 M 
B) 3 × 10-5 M 
C) 5 × 10-4 M 
D) 4 M 
E) 3 × 1010 M

Question 14

Predict the direction in which the equilibrium will lie for the reaction H3PO4 + NO3- 
     
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 15

Which one of the following equations represents the ionization of a weak base in water?

Accepted Answer

A) NH3(aq)+ H2O(l)     NH2+(aq)+ H3O+(aq) 
B) NH3(aq)+ H2O(l)     NH4+(aq)+ OH-(aq) 
C) NH3(aq)+ H2O(l)     NH4- (aq)+ OH+(aq) 
D) NH3(aq)+ OH-(aq)     NH2- (aq)+ H2O(l) 
E) NH3(aq)+ H3O+(aq)     NH4+(aq)+ H2O(l) 
A) NH3(aq)+ H2O(l)     NH2+(aq)+ H3O+(aq) 
B) NH3(aq)+ H2O(l)     NH4+(aq)+ OH-(aq) 
C) NH3(aq)+ H2O(l)     NH4- (aq)+ OH+(aq) 
D) NH3(aq)+ OH-(aq)     NH2- (aq)+ H2O(l) 
E) NH3(aq)+ H3O+(aq)     NH4+(aq)+ H2O(l)

Question 16

Calculate the pH of a 0.021 M NaCN solution.[Ka(HCN)= 4.9 × 10-10]

Accepted Answer

A) 1.68 
B) 3.18 
C) 5.49 
D) 7.00 
E) 10.82 
A) 1.68 
B) 3.18 
C) 5.49 
D) 7.00 
E) 10.82

Question 17

Which one of these salts will form a basic solution on dissolving in water?

Accepted Answer

A) NaCl 
B) KCN 
C) NaNO3 
D) NH4NO3 
E) FeCl3 
A) NaCl 
B) KCN 
C) NaNO3 
D) NH4NO3 
E) FeCl3

Question 18

Given the following Ka values, which anion is the strongest base?

Accepted Answer

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

Question 19

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 20

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

Accepted Answer

Exam 15: Acids and Bases

What is the pH of a 0.11 M solution of C6H5OH (Ka = 1.3 x 10-10)

Write the formula for the conjugate base of H2PO4-.

A 5.5 L sample of a 0.25 M HNO3 solution is mixed with 1.2 L of a 0.34 M HCl solution.What is the pH of the mixture?

Will a 0.1 M solution of NH4NO2(aq)be acidic, basic, or neutral?

Calculate the pH of a 6.7 × 10-2 M NaOH solution.

What is the pH of a solution prepared by mixing 100.mL of 0.0500 M HCl with 300.mL of 0.500 M HF? [Ka(HF)= 7.1 × 10-4]

The OH- concentration in a 7.5 × 10-3 M Ca(OH)2 solution is

Calculate the H+ ion concentration in lemon juice having a pH of 2.40.

Identify the conjugate acid of SO42-

Of the two acids HBr and H2Se, H2Se is the stronger acid.

Which one of these net ionic equations represents the reaction of a strong acid with a weak base?

Calculate the pH of a 0.18 M solution of KNO2 (Ka (HNO2)= 4.5 x 10-4)

The pH of tomato juice is about 4.5.Calculate the concentration of hydrogen ions in this juice.

Predict the direction in which the equilibrium will lie for the reaction H3PO4 + NO3- H2PO4- + HNO3 Ka(H3PO4)= 7.5 × 10-3

Which one of the following equations represents the ionization of a weak base in water?

Calculate the pH of a 0.021 M NaCN solution.[Ka(HCN)= 4.9 × 10-10]

Which one of these salts will form a basic solution on dissolving in water?

Given the following Ka values, which anion is the strongest base?

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

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

Chemistry: the Study of Change

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Filters

What is the pH of a 0.11 M solution of C₆H₅OH (K_a = 1.3 x 10^-10)

Write the formula for the conjugate base of H₂PO₄^-.

A 5.5 L sample of a 0.25 M HNO₃ solution is mixed with 1.2 L of a 0.34 M HCl solution.What is the pH of the mixture?

Will a 0.1 M solution of NH₄NO₂(aq)be acidic, basic, or neutral?

Calculate the pH of a 6.7 × 10^-2 M NaOH solution.

What is the pH of a solution prepared by mixing 100.mL of 0.0500 M HCl with 300.mL of 0.500 M HF? [K_a(HF)= 7.1 × 10^-4]

The OH^- concentration in a 7.5 × 10^-3 M Ca(OH)₂ solution is

Calculate the H⁺ ion concentration in lemon juice having a pH of 2.40.

Identify the conjugate acid of SO₄^2-

Of the two acids HBr and H₂Se, H₂Se is the stronger acid.

Calculate the pH of a 0.18 M solution of KNO₂ (K_a (HNO₂)= 4.5 x 10^-4)

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

Calculate the pH of a 0.021 M NaCN solution.[K_a(HCN)= 4.9 × 10^-10]

Given the following K_a values, which anion is the strongest base?

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