Question 1

What is the autoionization of water?

Accepted Answer

Autoionization of water is the equilibrium process where one water molecule will transfer its proton to another. This forms hydroxide ions and hydronium ions in equal numbers in solution. This autoionization process of water is what allows us to relate hydronium and hydroxide ion concentrations in aqueous solutions of acids and bases.

Question 2

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 A

Question 3

Which of the following is a weak acid?

Accepted Answer

A) HClO4 
B) H2SO4 
C) HCl 
D) HCO2H 
E) HNO3 
A) HClO4 
B) H2SO4 
C) HCl 
D) HCO2H 
E) HNO3 D

Question 4

Which of the following is a Bronsted-Lowry base?

Accepted Answer

A) CH4 
B) HCN 
C) NH3 
D) Cl2 
E) B2H6 
A) CH4 
B) HCN 
C) NH3 
D) Cl2 
E) B2H6

Question 5

Match the following.

-Lewis acid

Accepted Answer

A) proton donor 
B) electron pair acceptor 
C) proton acceptor 
D) electron pair donor 
E) produces protons in aqueous solution
F)produces hydroxide ions in aqueous solution 
A) proton donor 
B) electron pair acceptor 
C) proton acceptor 
D) electron pair donor 
E) produces protons in aqueous solution
F)produces hydroxide ions in aqueous solution

Question 6

If an equal number of moles of the weak acid HCN and the strong base KOH are added to water, is the resulting solution acidic, basic, or neutral?

Accepted Answer

A) acidic 
B) basic 
C) neutral 
D) Depends on the solution volume 
A) acidic 
B) basic 
C) neutral 
D) Depends on the solution volume

Question 7

Which of the following is a Lewis base?

Accepted Answer

A) AlF3 
B) H2O 
C) SiF4 
D) C5H12 
E) BH3 
A) AlF3 
B) H2O 
C) SiF4 
D) C5H12 
E) BH3

Question 8

Calculate the pOH of a solution that contains 2.4 × 10-5 mol L-1 H3O⁺ at 25 °C.

Accepted Answer

A) 2.40 
B) 9.38 
C) 4.62 
D) 11.60 
E) 4.17 
A) 2.40 
B) 9.38 
C) 4.62 
D) 11.60 
E) 4.17

Question 9

Which of the following correctly describes the characteristics of a strong acid?

Accepted Answer

A) ionizes only partially in aqueous solutions 
B) has a very electron positive atom attached to the oxygen 
C) has a nonpolar bond 
D) is completely ionized in aqueous solution 
E) is always monoprotic 
A) ionizes only partially in aqueous solutions 
B) has a very electron positive atom attached to the oxygen 
C) has a nonpolar bond 
D) is completely ionized in aqueous solution 
E) is always monoprotic

Question 10

Which one of the following salts, when dissolved in water, produces the solution with the lowest pH?

Accepted Answer

A) NaCl 
B) KCl 
C) MgCl2 
D) AlCl3 
A) NaCl 
B) KCl 
C) MgCl2 
D) AlCl3

Question 11

Determine the Kb for CN⁻ at 25 °C. The Ka for HCN is 4.9 × 10-10.

Accepted Answer

A) 4.9 × 10-14 
B) 2.3 × 10-9 
C) 1.4 × 10-5 
D) 2.0 × 10-5 
E) 3.7 × 10-7 
A) 4.9 × 10-14 
B) 2.3 × 10-9 
C) 1.4 × 10-5 
D) 2.0 × 10-5 
E) 3.7 × 10-7

Question 12

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 13

Describe the relationship between molecular structure and acid strength.

Accepted Answer

1)The stronger the bond between a hydrog

Question 14

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 15

Calculate the pH of a solution that contains 2.4 × 10-5 mol L-1 H3O⁺ at 25 °C.

Accepted Answer

A) 2.40 
B) 9.38 
C) 4.62 
D) 11.60 
E) 4.17 
A) 2.40 
B) 9.38 
C) 4.62 
D) 11.60 
E) 4.17

Question 16

Which of the following groups is found in carboxylic acids (like acetic acid)?

Accepted Answer

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

Question 17

Find the correct equilibrium constant that shows the ionization constant of a weak acid HA.

Accepted Answer

A) Ka =   
B) Ka =   
C) Ka =   
D) Ka =   
E) Ka =   
A) Ka =   
B) Ka =   
C) Ka =   
D) Ka =   
E) Ka =

Question 18

Which of the following is a polyprotic acid?

Accepted Answer

A) HF 
B) H2SO4 
C) HCN 
D) CH4 
E) HC2H3O2 
A) HF 
B) H2SO4 
C) HCN 
D) CH4 
E) HC2H3O2

Question 19

Which of the following acids is the weakest? The acid is followed by its Ka value.

Accepted Answer

A) CH3COOH, 1.8 × 10-5 
B) HIO, 2.3 × 10-11 
C) HBrO, 2.3 × 10-9 
D) HClO, 2.9 × 10-8 
E) C6H5COOH, 6.3 × 10-5 
A) CH3COOH, 1.8 × 10-5 
B) HIO, 2.3 × 10-11 
C) HBrO, 2.3 × 10-9 
D) HClO, 2.9 × 10-8 
E) C6H5COOH, 6.3 × 10-5

Question 20

Match the following.

-Lewis base

Accepted Answer

A) proton donor 
B) electron pair acceptor 
C) proton acceptor 
D) electron pair donor 
E) produces protons in aqueous solution
F)produces hydroxide ions in aqueous solution 
A) proton donor 
B) electron pair acceptor 
C) proton acceptor 
D) electron pair donor 
E) produces protons in aqueous solution
F)produces hydroxide ions in aqueous solution

Exam 15: Acids and Bases

What is the autoionization of water?

Which of the following is a Lewis acid?

Which of the following is a weak acid?

Which of the following is a Bronsted-Lowry base?

Match the following. -Lewis acid

If an equal number of moles of the weak acid HCN and the strong base KOH are added to water, is the resulting solution acidic, basic, or neutral?

Which of the following is a Lewis base?

Calculate the pOH of a solution that contains 2.4 × 10-5 mol L-1 H3O⁺ at 25 °C.

Which of the following correctly describes the characteristics of a strong acid?

Which one of the following salts, when dissolved in water, produces the solution with the lowest pH?

Determine the Kb for CN⁻ at 25 °C. The Ka for HCN is 4.9 × 10-10.

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

Describe the relationship between molecular structure and acid strength.

Which of the following is a Bronsted-Lowry acid?

Calculate the pH of a solution that contains 2.4 × 10-5 mol L-1 H3O⁺ at 25 °C.

Which of the following groups is found in carboxylic acids (like acetic acid)?

Find the correct equilibrium constant that shows the ionization constant of a weak acid HA.

Which of the following is a polyprotic acid?

Which of the following acids is the weakest? The acid is followed by its Ka value.

Match the following. -Lewis base

Units of Measurement for Physical and Chemical Change

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Chemical Reactions and Stoichiometry

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Filters

If an equal number of moles of the weak acid HCNand the strong base KOH are added to water, is the resulting solution acidic, basic, or neutral?

Calculate the pOH of a solution that contains 2.4 × 10^-5 mol L^-1 H₃O⁺ at 25 °C.

Determine the K_b for CN⁻ at 25 °C. The K_a for HCN is 4.9 × 10^-10.

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

Calculate the pH of a solution that contains 2.4 × 10^-5 mol L^-1 H₃O⁺ at 25 °C.

Which of the following acids is the weakest? The acid is followed by its K_a value.