Question 1

Which of these species will act as a Lewis acid?

Accepted Answer

A) NH3 
B) NH4+ 
C) H2O 
D) BF3 
E) F- 
A) NH3 
B) NH4+ 
C) H2O 
D) BF3 
E) F- D

Question 2

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 D

Question 3

If the pH of liquid bleach is 12.0, what is the hydroxide ion concentration in this solution?

Accepted Answer

1 × 10^-2 M

Question 4

Which of the following yields a basic solution when dissolved in water? I.NH3
 II.Na2O
III.LiOH
IV.P4O10

Accepted Answer

A) I and II 
B) I and IV 
C) II and III 
D) I, II, and III 
E) I, II, III, and IV 
A) I and II 
B) I and IV 
C) II and III 
D) I, II, and III 
E) I, II, III, and IV

Question 5

In the reaction HSO4-(aq)+ OH-(aq)     SO42-(aq)+ H2O(l), the conjugate acid-base pairs are

Accepted Answer

A) A 
B) B 
C) C 
D) D 
E) E 
A) A 
B) B 
C) C 
D) D 
E) E

Question 6

The equilibrium constant for the reaction C7H15COOH(aq)+ HCOO-(aq)    
C7H15COO-(aq)+ HCOOH(aq)
Is 7.23 × 10-2 at 25°C.If Ka for formic acid (HCOOH)is 1.77 × 10-4, what is the acid dissociation constant for C7H15COOH?

Accepted Answer

A) 2.45 × 10-3 
B) 4.08 × 10-2 
C) 7.81 × 10-4 
D) 1.00 × 10-4 
E) 1.28 × 10-5 
A) 2.45 × 10-3 
B) 4.08 × 10-2 
C) 7.81 × 10-4 
D) 1.00 × 10-4 
E) 1.28 × 10-5

Question 7

The pH of a 0.6 M solution of a weak acid is 4.0.What percent of the acid has ionized?

Accepted Answer

The answer of The pH of a 0.6 M solution...

Question 8

Which of these acids is stronger, H2SO4 or HSO4-?

Accepted Answer

Question 9

Determine the pH of a KOH solution made by mixing 0.251 g KOH with enough water to make 1.0 × 102 mL of solution.

Accepted Answer

A) 1.35 
B) 2.35 
C) 7.00 
D) 11.65 
E) 12.65 
A) 1.35 
B) 2.35 
C) 7.00 
D) 11.65 
E) 12.65

Question 10

Which of the following solutions is acidic?

Accepted Answer

A) [H3O+] = 7.0 x 10-7 M 
B) [H3O+] = 1.5 x 10-10 M 
C) [H3O+] -7 M 
D) [H3O+] > 7.0 x 10-7 M 
E) [H3O+] = 1.0 x 10-14 M 
A) [H3O+] = 7.0 x 10-7 M 
B) [H3O+] = 1.5 x 10-10 M 
C) [H3O+] -7 M 
D) [H3O+] > 7.0 x 10-7 M 
E) [H3O+] = 1.0 x 10-14 M

Question 11

The pOH of a solution is 10.40.Calculate the hydrogen ion concentration in the solution.

Accepted Answer

A) 4.0 × 10-11 M 
B) 3.6 M 
C) 4.0 × 10-10 M 
D) 2.5 × 10-4 M 
E) 1.8 × 10-4 M 
A) 4.0 × 10-11 M 
B) 3.6 M 
C) 4.0 × 10-10 M 
D) 2.5 × 10-4 M 
E) 1.8 × 10-4 M

Question 12

Calculate the concentration of oxalate ion (C2O42-)in a 0.175 M solution of oxalic acid (C2H2O4).[For oxalic acid, Ka1 = 6.5 × 10-2, Ka2 = 6.1 × 10-5.]

Accepted Answer

A) 0.11 M 
B) 6.1 × 10-5 M 
C) 4.0 × 10-6 M 
D) 0.0791 M 
E) 0.175 M 
A) 0.11 M 
B) 6.1 × 10-5 M 
C) 4.0 × 10-6 M 
D) 0.0791 M 
E) 0.175 M

Question 13

The hydronium ion and the hydroxide ion, in that order, are:

Accepted Answer

A) H3O+, OH+ 
B) OH-, H3O- 
C) OH-, H+ 
D) H3O+, OH- 
E) H3O-, OH- 
A) H3O+, OH+ 
B) OH-, H3O- 
C) OH-, H+ 
D) H3O+, OH- 
E) H3O-, OH-

Question 14

The equilibrium constant for the reaction C6H5COOH(aq)+ CH3COO-(aq)    
C6H5COO-(aq)+ CH3COOH(aq)
Is 3.6 at 25°C.If Ka for CH3COOH is 1.8 × 10-5, what is the acid dissociation constant for C6H5COOH?

Accepted Answer

A) 5.0 × 10-6 
B) 6.5 × 10-5 
C) 2.3 × 10-4 
D) 8.3 × 10-5 
E) 5.6 × 10-6 
A) 5.0 × 10-6 
B) 6.5 × 10-5 
C) 2.3 × 10-4 
D) 8.3 × 10-5 
E) 5.6 × 10-6

Question 15

Hard water deposits (calcium carbonate)have built up around your bathroom sink.Which one of these substances would be most effective in dissolving the deposits?

Accepted Answer

A) ammonia 
B) bleach (sodium hypochlorite) 
C) lye (sodium hydroxide) 
D) vinegar (acetic acid) 
A) ammonia 
B) bleach (sodium hypochlorite) 
C) lye (sodium hydroxide) 
D) vinegar (acetic acid)

Question 16

Calculate the pH of a carbonated beverage in which the hydrogen ion concentration is 3.4 × 10-4 M.

Accepted Answer

A) 2.34 
B) 3.47 
C) 6.01 
D) 7.99 
E) 10.53 
A) 2.34 
B) 3.47 
C) 6.01 
D) 7.99 
E) 10.53

Question 17

Identify the conjugate acid of CO32-

Accepted Answer

A) H2CO3 
B) HCO3- 
C) H2O 
D) H3O+ 
E) CO2 
A) H2CO3 
B) HCO3- 
C) H2O 
D) H3O+ 
E) CO2

Question 18

Which of the following is not a conjugate acid-base pair?

Accepted Answer

A) H3PO4 and H2PO4- 
B) H2PO4- and HPO42- 
C) H3PO4 and HPO42- 
D) HPO42- and PO43- 
E) H2O and H3O+ 
A) H3PO4 and H2PO4- 
B) H2PO4- and HPO42- 
C) H3PO4 and HPO42- 
D) HPO42- and PO43- 
E) H2O and H3O+

Question 19

What is the H+ ion concentration in a 4.8 × 10-2 M KOH solution?

Accepted Answer

A) 4.8 × 10-2 M 
B) 1.0 × 10-7 M 
C) 4.8 × 10-11 M 
D) 4.8 × 10-12 M 
E) 2.1 × 10-13 M 
A) 4.8 × 10-2 M 
B) 1.0 × 10-7 M 
C) 4.8 × 10-11 M 
D) 4.8 × 10-12 M 
E) 2.1 × 10-13 M

Question 20

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

Exam 15: Acids and Bases

Which of these species will act as a Lewis acid?

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

If the pH of liquid bleach is 12.0, what is the hydroxide ion concentration in this solution?

Which of the following yields a basic solution when dissolved in water? I.NH3 II.Na2O III.LiOH IV.P4O10

In the reaction HSO4-(aq)+ OH-(aq) SO42-(aq)+ H2O(l), the conjugate acid-base pairs are

The equilibrium constant for the reaction C7H15COOH(aq)+ HCOO-(aq) C7H15COO-(aq)+ HCOOH(aq) Is 7.23 × 10-2 at 25°C.If Ka for formic acid (HCOOH)is 1.77 × 10-4, what is the acid dissociation constant for C7H15COOH?

The pH of a 0.6 M solution of a weak acid is 4.0.What percent of the acid has ionized?

Which of these acids is stronger, H2SO4 or HSO4-?

Determine the pH of a KOH solution made by mixing 0.251 g KOH with enough water to make 1.0 × 102 mL of solution.

Which of the following solutions is acidic?

The pOH of a solution is 10.40.Calculate the hydrogen ion concentration in the solution.

Calculate the concentration of oxalate ion (C2O42-)in a 0.175 M solution of oxalic acid (C2H2O4).[For oxalic acid, Ka1 = 6.5 × 10-2, Ka2 = 6.1 × 10-5.]

The hydronium ion and the hydroxide ion, in that order, are:

The equilibrium constant for the reaction C6H5COOH(aq)+ CH3COO-(aq) C6H5COO-(aq)+ CH3COOH(aq) Is 3.6 at 25°C.If Ka for CH3COOH is 1.8 × 10-5, what is the acid dissociation constant for C6H5COOH?

Hard water deposits (calcium carbonate)have built up around your bathroom sink.Which one of these substances would be most effective in dissolving the deposits?

Calculate the pH of a carbonated beverage in which the hydrogen ion concentration is 3.4 × 10-4 M.

Identify the conjugate acid of CO32-

Which of the following is not a conjugate acid-base pair?

What is the H+ ion concentration in a 4.8 × 10-2 M KOH solution?

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]

Chemistry: the Study of Change

Atoms, Molecules, and Ions

Mass Relationships in Chemical Reactions

Reactions in Aqueous Solutions

Gases

Thermochemistry

Quantum Theory and the Electronic Structure of Atoms

Periodic Relationships Among the Elements

Chemical Bonding I: Basic Concepts

Chemical Bonding Ii: Molecular Geometry and Hybridization of Atomic Orbitals

Intermolecular Forces and Liquids and Solids

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acid-Base Equilibria and Solubility Equilibria

Entropy Free Energy and Equilibrium

Electrochemistry

Nuclear Chemistry

Chemistry in the Atmosphere

Metallurgy and the Chemistry of Metals

Nonmetallic Elements and Their Compounds

Transition Metal Chemistry and Coordination Compounds

Organic Chemistry

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Filters

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

Which of the following yields a basic solution when dissolved in water? I.NH₃ II.Na₂O III.LiOH IV.P₄O₁₀

In the reaction HSO₄^-(aq)+ OH^-(aq) SO₄^2-(aq)+ H₂O(l), the conjugate acid-base pairs are

The equilibrium constant for the reaction C₇H₁₅COOH(aq)+ HCOO^-(aq) C₇H₁₅COO^-(aq)+ HCOOH(aq) Is 7.23 × 10^-2 at 25°C.If K_a for formic acid (HCOOH)is 1.77 × 10^-4, what is the acid dissociation constant for C₇H₁₅COOH?

Which of these acids is stronger, H₂SO₄ or HSO₄^-?

Determine the pH of a KOH solution made by mixing 0.251 g KOH with enough water to make 1.0 × 10² mL of solution.

Calculate the concentration of oxalate ion (C₂O₄^2-)in a 0.175 M solution of oxalic acid (C₂H₂O₄).[For oxalic acid, K_a1 = 6.5 × 10^-2, K_a2 = 6.1 × 10^-5.]

The equilibrium constant for the reaction C₆H₅COOH(aq)+ CH₃COO^-(aq) C₆H₅COO^-(aq)+ CH₃COOH(aq) Is 3.6 at 25°C.If K_a for CH₃COOH is 1.8 × 10^-5, what is the acid dissociation constant for C₆H₅COOH?

Calculate the pH of a carbonated beverage in which the hydrogen ion concentration is 3.4 × 10^-4 M.

Identify the conjugate acid of CO₃^2-

What is the H⁺ ion concentration in a 4.8 × 10^-2 M KOH solution?

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]