Question 1

If the pH of pure water is 7.0, what is the hydroxide ion concentration in pure water?

Accepted Answer

The answer of If the pH of pure water is...

Question 2

When 2.0 × 10-2 mole of nicotinic acid (a monoprotic acid)is dissolved in 350.mL of water, the pH is 3.05.What is the Ka of nicotinic acid?

Accepted Answer

Question 3

Which one of these equations represents the reaction of a weak acid with a strong 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 4

Which one of these net ionic equations represents the reaction of a strong acid with a strong 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 5

Suppose that ammonia, applied to a field as a fertilizer, is washed into a farm pond containing 3.0 × 106 L of water.If the pH of this pond is found to be 9.81, what volume of liquid ammonia found its way into the pond? [Given: Kb(NH3)= 1.8 × 10-5; the density of liquid ammonia is 0.771 g/cm3]

Accepted Answer

A) 15 L 
B) 25 L 
C) 11 L 
D) 19 L 
E) 320 L 
A) 15 L 
B) 25 L 
C) 11 L 
D) 19 L 
E) 320 L

Question 6

Al(OH)3 is an amphoteric hydroxide.Write a balanced ionic equation to show its reaction with KOH.

Accepted Answer

Al(OH)₃ + K

Question 7

The pH of coffee is approximately 5.0.How many times greater is the [H3O+] in coffee than in tap water having a pH of 8.0?

Accepted Answer

A) 0.62 
B) 1.6 
C) 30 
D) 1,000 
E) 1.0 × 104 
A) 0.62 
B) 1.6 
C) 30 
D) 1,000 
E) 1.0 × 104

Question 8

Which of the following solutions is basic?

Accepted Answer

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

Question 9

Given the following Kb values, which cation is the strongest acid?

Accepted Answer

A) NH4+ 
B) C2H5NH3+ 
C) C5H6N+ 
D) [C8H11N4O2]+ 
E) [NH2NH3CO]+ 
A) NH4+ 
B) C2H5NH3+ 
C) C5H6N+ 
D) [C8H11N4O2]+ 
E) [NH2NH3CO]+

Question 10

When comparing acid strength of binary acids HX, as X varies within a particular group of the periodic table, which one of these factors dominates in affecting the acid strength?

Accepted Answer

A) bond strength 
B) electron withdrawing effects 
C) percent ionic character of the H-X bond 
D) solubility 
E) Le Châtelier's principle 
A) bond strength 
B) electron withdrawing effects 
C) percent ionic character of the H-X bond 
D) solubility 
E) Le Châtelier's principle

Question 11

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 12

Calculate the pH of a 0.15 M solution of HOI (Ka = 2.3 x 10-11)

Accepted Answer

Question 13

Calculate the concentration of malonate ion (C3H2O42-)in a 0.200 M solution of malonic acid (C3H4O4).[For malonic acid, Ka1 = 1.4 × 10-3, Ka2 = 2.0 × 10-6.]

Accepted Answer

A) 2.8 × 10-4 M 
B) 0.016 M 
C) 1.8 × 10-4 M 
D) 1.4 × 10-3 M 
E) 2.0 × 10-6 M 
A) 2.8 × 10-4 M 
B) 0.016 M 
C) 1.8 × 10-4 M 
D) 1.4 × 10-3 M 
E) 2.0 × 10-6 M

Question 14

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

Accepted Answer

A) NaCl 
B) KNO2 
C) NaCN 
D) NH4NO3 
E) FeCl3 
A) NaCl 
B) KNO2 
C) NaCN 
D) NH4NO3 
E) FeCl3

Question 15

The pH of coffee is approximately 5.0.How many times greater is the [H+] in coffee than in neutral water?

Accepted Answer

A) 200 
B) 100 
C) 5.0 
D) 1.4 
E) 0.01 
A) 200 
B) 100 
C) 5.0 
D) 1.4 
E) 0.01

Question 16

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

Accepted Answer

A) NaI 
B) NaF 
C) NH4NO3 
D) LiBr 
E) Cr(NO3)3 
A) NaI 
B) NaF 
C) NH4NO3 
D) LiBr 
E) Cr(NO3)3

Question 17

For maleic acid, HOOCCH=CHCOOH, Ka1 = 1.42 × 10-2 and Ka2 = 8.57 × 10-7. What is the concentration of maleate ion (-OOCCH=CHCOO-)in a 0.150 M aqueous solution of maleic acid?

Accepted Answer

A) 8.57 × 10-7 M 
B) 2.79 × 10-6 M 
C) 1.86 × 10-5 M 
D) 4.60 × 10-2 M 
E) 1.19 × 10-1 M 
A) 8.57 × 10-7 M 
B) 2.79 × 10-6 M 
C) 1.86 × 10-5 M 
D) 4.60 × 10-2 M 
E) 1.19 × 10-1 M

Question 18

Calculate the pH of a 1.6 M KOH solution.

Accepted Answer

A) 1.60 
B) -0.20 
C) 0.20 
D) 14.20 
E) 13.80 
A) 1.60 
B) -0.20 
C) 0.20 
D) 14.20 
E) 13.80

Exam 15: Acids and Bases

If the pH of pure water is 7.0, what is the hydroxide ion concentration in pure water?

When 2.0 × 10-2 mole of nicotinic acid (a monoprotic acid)is dissolved in 350.mL of water, the pH is 3.05.What is the Ka of nicotinic acid?

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

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

Suppose that ammonia, applied to a field as a fertilizer, is washed into a farm pond containing 3.0 × 106 L of water.If the pH of this pond is found to be 9.81, what volume of liquid ammonia found its way into the pond? [Given: Kb(NH3)= 1.8 × 10-5; the density of liquid ammonia is 0.771 g/cm3]

Al(OH)3 is an amphoteric hydroxide.Write a balanced ionic equation to show its reaction with KOH.

The pH of coffee is approximately 5.0.How many times greater is the [H3O+] in coffee than in tap water having a pH of 8.0?

Which of the following solutions is basic?

Given the following Kb values, which cation is the strongest acid?

When comparing acid strength of binary acids HX, as X varies within a particular group of the periodic table, which one of these factors dominates in affecting the acid strength?

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.)

Calculate the pH of a 0.15 M solution of HOI (Ka = 2.3 x 10-11)

Calculate the concentration of malonate ion (C3H2O42-)in a 0.200 M solution of malonic acid (C3H4O4).[For malonic acid, Ka1 = 1.4 × 10-3, Ka2 = 2.0 × 10-6.]

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

The pH of coffee is approximately 5.0.How many times greater is the [H+] in coffee than in neutral water?

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

For maleic acid, HOOCCH=CHCOOH, Ka1 = 1.42 × 10-2 and Ka2 = 8.57 × 10-7. What is the concentration of maleate ion (-OOCCH=CHCOO-)in a 0.150 M aqueous solution of maleic acid?

Calculate the pH of a 1.6 M KOH solution.

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When 2.0 × 10^-2 mole of nicotinic acid (a monoprotic acid)is dissolved in 350.mL of water, the pH is 3.05.What is the K_a of nicotinic acid?

Al(OH)₃ is an amphoteric hydroxide.Write a balanced ionic equation to show its reaction with KOH.

The pH of coffee is approximately 5.0.How many times greater is the [H₃O⁺] in coffee than in tap water having a pH of 8.0?

Given the following K_b values, which cation is the strongest acid?

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.)

Calculate the pH of a 0.15 M solution of HOI (K_a = 2.3 x 10^-11)

Calculate the concentration of malonate ion (C₃H₂O₄^2-)in a 0.200 M solution of malonic acid (C₃H₄O₄).[For malonic acid, K_a1 = 1.4 × 10^-3, K_a2 = 2.0 × 10^-6.]

The pH of coffee is approximately 5.0.How many times greater is the [H⁺] in coffee than in neutral water?

For maleic acid, HOOCCH=CHCOOH, K_a1 = 1.42 × 10^-2 and K_a2 = 8.57 × 10^-7. What is the concentration of maleate ion (^-OOCCH=CHCOO^-)in a 0.150 M aqueous solution of maleic acid?