Question 1

What is the hydronium ion concentration of an acid rain sample that has a pH of 3.45?

Accepted Answer

A) 2.82 × 10-11 mol L-1 
B) 3.55 × 10-4 mol L-1 
C) 3.45 mol L-1 
D) 10.55 mol L-1 
A) 2.82 × 10-11 mol L-1 
B) 3.55 × 10-4 mol L-1 
C) 3.45 mol L-1 
D) 10.55 mol L-1

Question 2

Which of the following is a triprotic acid?

Accepted Answer

A) HF 
B) H2SO4 
C) H3PO4 
D) H2SO3 
E) HC2H3O2 
A) HF 
B) H2SO4 
C) H3PO4 
D) H2SO3 
E) HC2H3O2

Question 3

Determine the [H3O+] in a 0.265 mol L-1 HClO solution.The Ka of HClO is 2.9 × 10-8.

Accepted Answer

A) 1.1 × 10-10 mol L-1 
B) 7.7 × 10-9 mol L-1 
C) 1.3 × 10-6 mol L-1 
D) 4.9 × 10-4 mol L-1 
E) 8.8 × 10-5 mol L-1 
A) 1.1 × 10-10 mol L-1 
B) 7.7 × 10-9 mol L-1 
C) 1.3 × 10-6 mol L-1 
D) 4.9 × 10-4 mol L-1 
E) 8.8 × 10-5 mol L-1

Question 4

Determine the pH of a 0.188 mol L-1 NH3 solution at 25 °C.The Kb of NH3 is 1.76 × 10-5.

Accepted Answer

A) 5.480 
B) 2.740 
C) 8.520 
D) 11.260 
E) 12.656 
A) 5.480 
B) 2.740 
C) 8.520 
D) 11.260 
E) 12.656

Question 5

Calculate the pH of a 0.345 mol L-1 solution of formic acid,Ka = 1.8 × 10-4.

Accepted Answer

A) 2.10 
B) 2.49 
C) 3.17 
D) 1.60 
E) 2.04 
A) 2.10 
B) 2.49 
C) 3.17 
D) 1.60 
E) 2.04

Question 6

Which of the following is a weak base?

Accepted Answer

A) NH(CH3)2 
B) N2 
C) NaOH 
D) CH2CH2 
E) Ca(OH)2 
A) NH(CH3)2 
B) N2 
C) NaOH 
D) CH2CH2 
E) Ca(OH)2

Question 7

Which of the following is a Lewis acid?

Accepted Answer

A) BCl3 
B) CH4 
C) NH3 
D) CHCl3 
E) CCl4 
A) BCl3 
B) CH4 
C) NH3 
D) CHCl3 
E) CCl4

Question 8

Determine the [OH-] concentration in a 0.169 mol L-1 Ca(OH)2 solution.

Accepted Answer

A) 0.338 mol L-1 
B) 0.169 mol L-1 
C) 5.92 × 10-14 mol L-1 
D) 2.96 × 10-14 mol L-1 
E) 0.298 mol L-1 
A) 0.338 mol L-1 
B) 0.169 mol L-1 
C) 5.92 × 10-14 mol L-1 
D) 2.96 × 10-14 mol L-1 
E) 0.298 mol L-1

Question 9

The acid-dissociation constant at 25.0 °C for hypochlorous acid (HClO)is 3.0 × $10 ^ { - 8 }$ .At equilibrium,the molarity of $\mathrm { H } _ { 3 } \mathrm { O } ^ { + }$ in a 0.030 mol L-1 solution of HClO is ________.

Accepted Answer

A) 1.52 mol L-1 
B) 3.3 × 10-10 mol L-1 
C) 4.52 mol L-1 
D) 0.030 mol L-1 
E) 3.0 × 10-5 mol L-1 
A) 1.52 mol L-1 
B) 3.3 × 10-10 mol L-1 
C) 4.52 mol L-1 
D) 0.030 mol L-1 
E) 3.0 × 10-5 mol L-1

Question 10

When dissolved in water,which compound is generally considered to be an Arrhenius acid?

Accepted Answer

A) H CN  
B) NaOH 
C) Na F  
D) CH3CH2OH 
A) H CN  
B) NaOH 
C) Na F  
D) CH3CH2OH

Question 11

Which of the following is correct?

Accepted Answer

A) The smaller the acid ionization constant is,the more the acid ionizes and the stronger the acid. 
B) The larger the acid ionization constant is,the less the acid ionizes and the weaker the acid. 
C) The smaller the acid ionization constant is,the less the acid ionizes and the weaker the acid. 
D) The smaller the acid ionization constant is,the less the acid ionizes and the weaker its conjugate base is. 
E) The smaller the acid ionization constant is,the more the acid ionizes and the weaker the acid. 
A) The smaller the acid ionization constant is,the more the acid ionizes and the stronger the acid. 
B) The larger the acid ionization constant is,the less the acid ionizes and the weaker the acid. 
C) The smaller the acid ionization constant is,the less the acid ionizes and the weaker the acid. 
D) The smaller the acid ionization constant is,the less the acid ionizes and the weaker its conjugate base is. 
E) The smaller the acid ionization constant is,the more the acid ionizes and the weaker the acid.

Question 12

What is the conjugate acid of HCO3⁻ ?

Accepted Answer

A) H3O+ 
B) H2O 
C) CO32- 
D) OH- 
E) H2CO3 
A) H3O+ 
B) H2O 
C) CO32- 
D) OH- 
E) H2CO3

Question 13

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 14

Calculate the pH of a 0.200 mol L-1 solution of formic acid,Ka = 1.8 × 10-4.

Accepted Answer

A) 3.84 
B) 2.22 
C) 4.62 
D) 1.97 
E) 3.07 
A) 3.84 
B) 2.22 
C) 4.62 
D) 1.97 
E) 3.07

Question 15

Determine the pOH in a 0.235 mol L-1 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 16

Which of the following equilibria represents the second ionization step of H3PO4?

Accepted Answer

A) H3PO4(aq)+ H2O(l)⇌ H2PO4-(aq)+ H3O+(aq) 
B) H3PO4(aq)+ 2H2O(l)⇌ HPO42-(aq)+ 2H3O+(aq) 
C) H2PO4-(aq)+ H2O(l)⇌ HPO42-(aq)+ H3O+(aq) 
D) HPO42-(aq)+ H2O(aq)⇌ PO43-(aq)+ H3O+(aq) 
E) H3PO4(aq)+ 3H2O(l)⇌ PO43-(aq)+ 3H3O+(aq) 
A) H3PO4(aq)+ H2O(l)⇌ H2PO4-(aq)+ H3O+(aq) 
B) H3PO4(aq)+ 2H2O(l)⇌ HPO42-(aq)+ 2H3O+(aq) 
C) H2PO4-(aq)+ H2O(l)⇌ HPO42-(aq)+ H3O+(aq) 
D) HPO42-(aq)+ H2O(aq)⇌ PO43-(aq)+ H3O+(aq) 
E) H3PO4(aq)+ 3H2O(l)⇌ PO43-(aq)+ 3H3O+(aq)

Question 17

What is the pH of a 0.500 mol L-1 NH3 solution that has Kb = 1.8 × 10-5? The equation for the dissociation of NH3 is below: $$\mathrm { NH } _ { 3 } ( a q ) + \mathrm { H } _ { 2 } \mathrm { O } ( l ) \rightleftharpoons \mathrm { NH } _ { 4 } + ( a q ) + \mathrm { OH } ^ { - } ( a q )$$

Accepted Answer

A) 2.22 
B) 2.52 
C) 11.48 
D) 10.48 
A) 2.22 
B) 2.52 
C) 11.48 
D) 10.48

Question 18

Which of the following is a Bronsted-Lowry acid?

Accepted Answer

A) NH4+ 
B) CH4 
C) NH2- 
D) NH3 
E) Br2 
A) NH4+ 
B) CH4 
C) NH2- 
D) NH3 
E) Br2

Question 19

Determine the pH of a 0.741 mol L-1 KOH solution at 25 °C.

Accepted Answer

A) 0.13 
B) 13.87 
C) 0.17 
D) 12.65 
E) 11.88 
A) 0.13 
B) 13.87 
C) 0.17 
D) 12.65 
E) 11.88

Question 20

Calculate the pH of a solution that contains 7.8 × 10-6 mol L-1 OH- at 25 °C.

Accepted Answer

A) 1.28 
B) 5.11 
C) 12.72 
D) 8.89 
E) 9.64 
A) 1.28 
B) 5.11 
C) 12.72 
D) 8.89 
E) 9.64

Exam 15: Acids and Bases

What is the hydronium ion concentration of an acid rain sample that has a pH of 3.45?

Which of the following is a triprotic acid?

Determine the [H3O+] in a 0.265 mol L-1 HClO solution.The Ka of HClO is 2.9 × 10-8.

Determine the pH of a 0.188 mol L-1 NH3 solution at 25 °C.The Kb of NH3 is 1.76 × 10-5.

Calculate the pH of a 0.345 mol L-1 solution of formic acid,Ka = 1.8 × 10-4.

Which of the following is a weak base?

Which of the following is a Lewis acid?

Determine the [OH-] concentration in a 0.169 mol L-1 Ca(OH)2 solution.

The acid-dissociation constant at 25.0 °C for hypochlorous acid (HClO)is 3.0 × 10−810 ^ { - 8 }10−8 .At equilibrium,the molarity of H3O+\mathrm { H } _ { 3 } \mathrm { O } ^ { + }H3​O+ in a 0.030 mol L-1 solution of HClO is ________.

When dissolved in water,which compound is generally considered to be an Arrhenius acid?

Which of the following is correct?

What is the conjugate acid of HCO3⁻ ?

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

Calculate the pH of a 0.200 mol L-1 solution of formic acid,Ka = 1.8 × 10-4.

Determine the pOH in a 0.235 mol L-1 NaOH solution.

Which of the following equilibria represents the second ionization step of H3PO4?

Which of the following is a Bronsted-Lowry acid?

Determine the pH of a 0.741 mol L-1 KOH solution at 25 °C.

Calculate the pH of a solution that contains 7.8 × 10-6 mol L-1 OH- at 25 °C.

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Filters

Determine the [H₃O⁺] in a 0.265 mol L^-1 HClO solution.The K_a of HClO is 2.9 × 10^-8.

Determine the pH of a 0.188 mol L^-1 NH₃ solution at 25 °C.The K_bof NH₃ is 1.76 × 10^-5.

Calculate the pH of a 0.345 mol L^-1 solution of formic acid,K_a = 1.8 × 10^-4.

Determine the [OH^-] concentration in a 0.169 mol L^-1 Ca(OH)₂ solution.

The acid-dissociation constant at 25.0 °C for hypochlorous acid (HClO)is 3.0 × $10 ^ { - 8 }$ .At equilibrium,the molarity of $\mathrm { H } _ { 3 } \mathrm { O } ^ { + }$ in a 0.030 mol L^-1 solution of HClO is ________.

What is the conjugate acid of HCO₃⁻ ?

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

Calculate the pH of a 0.200 mol L^-1 solution of formic acid,K_a = 1.8 × 10^-4.

Determine the pOH in a 0.235 mol L^-1 NaOH solution.

Which of the following equilibria represents the second ionization step of H₃PO₄?

Determine the pH of a 0.741 mol L^-1 KOH solution at 25 °C.

Calculate the pH of a solution that contains 7.8 × 10^-6 mol L^-1 OH^- at 25 °C.