Question 1

Do both protons ionize instantaneously from a diprotic acid such as H2CO3? Explain your answer.

Accepted Answer

No.Polyprotic acids ionize in stages.A s

Question 2

Determine the pOH of a 0.227 M C5H5N solution at 25°C.The Kb of C5H5N is 1.7 × 10-9.

Accepted Answer

A)  4.59 
B)  9.41 
C)  4.71 
D)  10.14 
E)  9.29 
A)  4.59 
B)  9.41 
C)  4.71 
D)  10.14 
E)  9.29

Question 3

What is the pH of a 0.100 M NH3 solution that has Kb = 1.8 × 10-5? The equation for the dissociation of NH3 is: NH3(aq)+ H2O(l)⇌ NH4+(aq)+ OH-(aq)

Accepted Answer

A)  1.87 
B)  2.87 
C)  11.13 
D)  10.13 
A)  1.87 
B)  2.87 
C)  11.13 
D)  10.13

Question 4

In a triprotic acid,which Ka has the highest value?

Accepted Answer

A)  Ka1 
B)  Ka2 
C)  Ka3 
D)  Kb1 
E)  Kb2 
A)  Ka1 
B)  Ka2 
C)  Ka3 
D)  Kb1 
E)  Kb2

Question 5

________ is a painful burning sensation in the esophagus just below the chest.

Accepted Answer

A)  Mucus 
B)  Lung disease 
C)  Heartburn 
D)  Arthritis 
E)  Hardening of the arteries 
A)  Mucus 
B)  Lung disease 
C)  Heartburn 
D)  Arthritis 
E)  Hardening of the arteries

Question 6

Determine the pOH in a 0.235 M NaOH solution.

Accepted Answer

A)  13.76 
B)  0.24 
C)  13.37 
D)  0.63 
E)  12 
A)  13.76 
B)  0.24 
C)  13.37 
D)  0.63 
E)  12

Question 7

Determine the pH of a 0.22 M NaF solution at 25°C.The Ka of HF is 3.5 × 10-5.

Accepted Answer

A)  10.20 
B)  5.10 
C)  8.90 
D)  11.44 
E)  2.56 
A)  10.20 
B)  5.10 
C)  8.90 
D)  11.44 
E)  2.56

Question 8

Calculate the pH of a 1.60 M CH3NH3Cl solution.Kb for methylamine,CH3NH2,is 3.7 × 10-4.

Accepted Answer

A)  1.61 
B)  5.18 
C)  8.82 
D)  12.39 
A)  1.61 
B)  5.18 
C)  8.82 
D)  12.39

Question 9

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

Accepted Answer

A)  CCl4 
B)  HF 
C)  NH3 
D)  I2 
E)  None of the above is a Br∅nsted-Lowry base. 
A)  CCl4 
B)  HF 
C)  NH3 
D)  I2 
E)  None of the above is a Br∅nsted-Lowry base.

Question 10

What is the hydroxide ion concentration and the pH for a hydrochloric acid solution that has a hydronium ion concentration of

Accepted Answer

A)  6.67 × 10-12 M, 2.82 
B)  6.67 × 10-12 M, 11.18 
C)  6.67 × 10-13 M, 1.82 
D)  6.67 × 10-13 M, 12.17 
A)  6.67 × 10-12 M, 2.82 
B)  6.67 × 10-12 M, 11.18 
C)  6.67 × 10-13 M, 1.82 
D)  6.67 × 10-13 M, 12.17

Question 11

Identify the products when hydrochloric acid completely ionizes in water.

Accepted Answer

A)  H3O+ and Cl- 
B)  HCl and H2O 
C)  2 H+, OH-, and Cl- 
D)  HOCl and H2 
E)  HCl, H+, and OH- 
A)  H3O+ and Cl- 
B)  HCl and H2O 
C)  2 H+, OH-, and Cl- 
D)  HOCl and H2 
E)  HCl, H+, and OH-

Question 12

Calculate the pH of a solution that contains 3.9 × 10-5 M H3O⁺ at 25°C.

Accepted Answer

A)  5.41 
B)  4.41 
C)  9.59 
D)  8.59 
E)  0.59 
A)  5.41 
B)  4.41 
C)  9.59 
D)  8.59 
E)  0.59

Question 13

Which of the following is a weak base?

Accepted Answer

A)  NH(CH3)2 
B)  O2 
C)  KOH 
D)  CH2CBr2 
E)  None of the above is a weak base. 
A)  NH(CH3)2 
B)  O2 
C)  KOH 
D)  CH2CBr2 
E)  None of the above is a weak base.

Question 14

Acid reflux is when ________ backs up out of the stomach and into the esophagus.

Accepted Answer

A)  nitric acid 
B)  nitrous acid 
C)  phosphoric acid 
D)  sulfuric acid 
E)  hydrochloric acid 
A)  nitric acid 
B)  nitrous acid 
C)  phosphoric acid 
D)  sulfuric acid 
E)  hydrochloric acid

Question 15

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

Accepted Answer

A)  NH4+/NH3 
B)  H3O⁺/OH⁻ 
C)  H2SO3/HSO3⁻ 
D)  C2H3O2⁻/HC2H3O2 
E)  All of the above are conjugate acid-base pairs. 
A)  NH4+/NH3 
B)  H3O⁺/OH⁻ 
C)  H2SO3/HSO3⁻ 
D)  C2H3O2⁻/HC2H3O2 
E)  All of the above are conjugate acid-base pairs.

Question 16

Which of the following is an Arrhenius acid?

Accepted Answer

A)  H2SO3 
B)  CsOH 
C)  NH2CH3 
D)  CH3CI3 
E)  LiCl 
A)  H2SO3 
B)  CsOH 
C)  NH2CH3 
D)  CH3CI3 
E)  LiCl

Question 17

Calculate the hydronium ion concentration in an aqueous solution that contains 2.50 × 10-6 M in hydroxide ion.

Accepted Answer

A)  4.00 × 10-7 M 
B)  4.00 × 10-8 M 
C)  4.00 × 10-9 M 
D)  5.00 × 10-9 M 
A)  4.00 × 10-7 M 
B)  4.00 × 10-8 M 
C)  4.00 × 10-9 M 
D)  5.00 × 10-9 M

Question 18

Calculate the hydroxide ion concentration in an aqueous solution with a pOH of 9.85 at 25°C.

Accepted Answer

A)  7.1 × 10-5 M 
B)  4.2 × 10-10 M 
C)  8.7 × 10-10 M 
D)  6.5 × 10-5 M 
E)  1.4 × 10-10 M 
A)  7.1 × 10-5 M 
B)  4.2 × 10-10 M 
C)  8.7 × 10-10 M 
D)  6.5 × 10-5 M 
E)  1.4 × 10-10 M

Question 19

What are the hydronium ion concentration and the pH for an aqueous solution of NH3 that has a hydroxide ion concentration of 2.25 × 10-2 M?

Accepted Answer

A)  4.44 × 10-12 M and 2.65 
B)  4.44 × 10-12 M and 11.35 
C)  4.44 × 10-13 M and 1.65 
D)  4.44 × 10-13 M and 12.35 
A)  4.44 × 10-12 M and 2.65 
B)  4.44 × 10-12 M and 11.35 
C)  4.44 × 10-13 M and 1.65 
D)  4.44 × 10-13 M and 12.35

Question 20

An Arrhenius acid

Accepted Answer

A)  donates an electron pair. 
B)  is a H+ donor. 
C)  is a H+ acceptor. 
D)  produces OH- in aqueous solutions. 
E)  produces H+ in aqueous solutions. 
A)  donates an electron pair. 
B)  is a H+ donor. 
C)  is a H+ acceptor. 
D)  produces OH- in aqueous solutions. 
E)  produces H+ in aqueous solutions.

Exam 16: Acids and Bases

Do both protons ionize instantaneously from a diprotic acid such as H2CO3? Explain your answer.

Determine the pOH of a 0.227 M C5H5N solution at 25°C.The Kb of C5H5N is 1.7 × 10-9.

What is the pH of a 0.100 M NH3 solution that has Kb = 1.8 × 10-5? The equation for the dissociation of NH3 is: NH3(aq)+ H2O(l)⇌ NH4+(aq)+ OH-(aq)

In a triprotic acid,which Ka has the highest value?

________ is a painful burning sensation in the esophagus just below the chest.

Determine the pOH in a 0.235 M NaOH solution.

Determine the pH of a 0.22 M NaF solution at 25°C.The Ka of HF is 3.5 × 10-5.

Calculate the pH of a 1.60 M CH3NH3Cl solution.Kb for methylamine,CH3NH2,is 3.7 × 10-4.

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

What is the hydroxide ion concentration and the pH for a hydrochloric acid solution that has a hydronium ion concentration of

Identify the products when hydrochloric acid completely ionizes in water.

Calculate the pH of a solution that contains 3.9 × 10-5 M H3O⁺ at 25°C.

Which of the following is a weak base?

Acid reflux is when ________ backs up out of the stomach and into the esophagus.

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

Which of the following is an Arrhenius acid?

Calculate the hydronium ion concentration in an aqueous solution that contains 2.50 × 10-6 M in hydroxide ion.

Calculate the hydroxide ion concentration in an aqueous solution with a pOH of 9.85 at 25°C.

What are the hydronium ion concentration and the pH for an aqueous solution of NH3 that has a hydroxide ion concentration of 2.25 × 10-2 M?

An Arrhenius acid

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Filters

Do both protons ionize instantaneously from a diprotic acid such as H₂CO₃? Explain your answer.

Determine the pOH of a 0.227 M C₅H₅N solution at 25°C.The K_b of C₅H₅N is 1.7 × 10^-9.

What is the pH of a 0.100 M NH₃ solution that has K_b = 1.8 × 10^-5? The equation for the dissociation of NH₃ is: NH₃(aq)+ H₂O(l)⇌ NH₄⁺(aq)+ OH^-(aq)

In a triprotic acid,which K_a has the highest value?

Determine the pH of a 0.22 M NaF solution at 25°C.The K_a of HF is 3.5 × 10^-5.

Calculate the pH of a 1.60 M CH₃NH₃Cl solution.K_b for methylamine,CH₃NH₂,is 3.7 × 10^-⁴.

Calculate the pH of a solution that contains 3.9 × 10^-⁵ M H₃O⁺ at 25°C.

Calculate the hydronium ion concentration in an aqueous solution that contains 2.50 × 10^-⁶ M in hydroxide ion.

What are the hydronium ion concentration and the pH for an aqueous solution of NH₃ that has a hydroxide ion concentration of 2.25 × 10^-2 M?