Question 1

Calculate the pOH of an aqueous solution with a pH of 9.85 at 25 °C.

Accepted Answer

A) 2.15 
B) 3.15 
C) 4.15 
D) 5.15 
E) 4.00 
A) 2.15 
B) 3.15 
C) 4.15 
D) 5.15 
E) 4.00

Question 2

What is the pH of pure water at 40.0 °C if the Kw at this temperature is 2.92 × 10-14?

Accepted Answer

A) 6.767 
B) 0.465 
C) 7.000 
D) 7.233 
E) 8.446 
A) 6.767 
B) 0.465 
C) 7.000 
D) 7.233 
E) 8.446

Question 3

Which of the following statements is TRUE?

Accepted Answer

A) A strong acid is composed of a proton and an anion that have a very strong attraction for one another. 
B) A weak base is composed of a cation and an anion with a very weak attraction between them. 
C) A strong acid has a strong conjugate base. 
D) The conjugate base of a very weak acid is stronger than the conjugate base of a strong acid. 
E) The dissociation reaction of a weak acid is completely shifted to the right. 
A) A strong acid is composed of a proton and an anion that have a very strong attraction for one another. 
B) A weak base is composed of a cation and an anion with a very weak attraction between them. 
C) A strong acid has a strong conjugate base. 
D) The conjugate base of a very weak acid is stronger than the conjugate base of a strong acid. 
E) The dissociation reaction of a weak acid is completely shifted to the right.

Question 4

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 5

Match the following.

-Bronsted-Lowry 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

Question 6

Identify the strongest acid.

Accepted Answer

A) HClO4 
B) HClO3 
C) HClO2 
D) HClO 
A) HClO4 
B) HClO3 
C) HClO2 
D) HClO

Question 7

Identify the monoprotic acid.

Accepted Answer

A) H2CO3 
B) NH3 
C) H3PO4 
D) H2SO4 
E) HBr 
A) H2CO3 
B) NH3 
C) H3PO4 
D) H2SO4 
E) HBr

Question 8

Match the following.

-Arrhenius 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

Question 9

An aqueous solution at 25.0 °C contains [H+] = 0.085 mol L-1. What is the pH of the solution?

Accepted Answer

A) 1.07 
B) -1.07 
C) 13.0 
D) 0.0850 
E) 1.20 ×   
A) 1.07 
B) -1.07 
C) 13.0 
D) 0.0850 
E) 1.20 ×

Question 10

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

Accepted Answer

A) RbI 
B) RbBr 
C) RbCl 
D) RbF 
A) RbI 
B) RbBr 
C) RbCl 
D) RbF

Question 11

What is the hydroxide ion concentration of a lye solution that has a pH of 9.20?

Accepted Answer

A) 6.3 × 10-10 mol L-1 
B) 1.6 × 10-5 mol L-1 
C) 4.8 mol L-1 
D) 9.2 mol L-1 
A) 6.3 × 10-10 mol L-1 
B) 1.6 × 10-5 mol L-1 
C) 4.8 mol L-1 
D) 9.2 mol L-1

Question 12

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

Accepted Answer

A) 7.1 × 10-5 mol L-1 
B) 4.2 × 10-10 mol L-1 
C) 8.7 × 10-10 mol L-1 
D) 6.5 × 10-5 mol L-1 
E) 1.4 × 10-10 mol L-1 
A) 7.1 × 10-5 mol L-1 
B) 4.2 × 10-10 mol L-1 
C) 8.7 × 10-10 mol L-1 
D) 6.5 × 10-5 mol L-1 
E) 1.4 × 10-10 mol L-1

Question 13

Which of the following is TRUE?

Accepted Answer

A) A neutral solution contains [H2O] = [H3O⁺] 
B) A neutral solution does not contain any H3O+ or OH- 
C) An acidic solution has [H3O⁺] > [OH⁻] 
D) A basic solution does not contain H3O+ 
E) An acidic solution does not contain OH- 
A) A neutral solution contains [H2O] = [H3O⁺] 
B) A neutral solution does not contain any H3O+ or OH- 
C) An acidic solution has [H3O⁺] > [OH⁻] 
D) A basic solution does not contain H3O+ 
E) An acidic solution does not contain OH-

Question 14

What is the conjugate base of H2PO4⁻?

Accepted Answer

A) HPO42- 
B) PO43- 
C) H3PO4 
D) H3O+ 
E) OH⁻ 
A) HPO42- 
B) PO43- 
C) H3PO4 
D) H3O+ 
E) OH⁻

Question 15

Determine the pOH 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 16

Determine the pH of a 0.461 mol L-1 C6H5CO2H solution if the Ka of C6H5CO2H is 6.5 × 10-5.

Accepted Answer

A) 2.26 
B) 4.52 
C) 11.74 
D) 9.48 
E) 5.48 
A) 2.26 
B) 4.52 
C) 11.74 
D) 9.48 
E) 5.48

Question 17

The stronger the acid:

Accepted Answer

A) the stronger the conjugate acid. 
B) the stronger the conjugate base. 
C) the weaker the conjugate base. 
D) the weaker the conjugate acid. 
E) the stronger the conjugate acid-base pair. 
A) the stronger the conjugate acid. 
B) the stronger the conjugate base. 
C) the weaker the conjugate base. 
D) the weaker the conjugate acid. 
E) the stronger the conjugate acid-base pair.

Question 18

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 19

Which of the following increases the strength of a binary acid, HY?

Accepted Answer

A) decreasing the electron affinity of Y and decreasing the H-Y bond strength 
B) increasing the electron affinity of Y and increasing the H-Y bond strength 
C) increasing the electron affinity of Y and decreasing the H-Y bond strength 
D) decreasing the electron affinity of Y and increasing the H-Y bond strength 
E) lowering the electron affinity of Y and decreasing the H-Y bond strength 
A) decreasing the electron affinity of Y and decreasing the H-Y bond strength 
B) increasing the electron affinity of Y and increasing the H-Y bond strength 
C) increasing the electron affinity of Y and decreasing the H-Y bond strength 
D) decreasing the electron affinity of Y and increasing the H-Y bond strength 
E) lowering the electron affinity of Y and decreasing the H-Y bond strength

Question 20

Calculate the pH of a 0.800 mol L-1 NaCH3CO2 solution. Ka for acetic acid, CH3CO2H, is 1.8 × 10-5.

Accepted Answer

A) 2.42 
B) 4.68 
C) 9.32 
D) 11.58 
A) 2.42 
B) 4.68 
C) 9.32 
D) 11.58

Exam 15: Acids and Bases

Calculate the pOH of an aqueous solution with a pH of 9.85 at 25 °C.

What is the pH of pure water at 40.0 °C if the Kw at this temperature is 2.92 × 10-14?

Which of the following statements is TRUE?

Which of the following is correct:

Match the following. -Bronsted-Lowry base

Identify the strongest acid.

Identify the monoprotic acid.

Match the following. -Arrhenius base

An aqueous solution at 25.0 °C contains [H+] = 0.085 mol L-1. What is the pH of the solution?

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

What is the hydroxide ion concentration of a lye solution that has a pH of 9.20?

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

Which of the following is TRUE?

What is the conjugate base of H2PO4⁻?

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

Determine the pH of a 0.461 mol L-1 C6H5CO2H solution if the Ka of C6H5CO2H is 6.5 × 10-5.

The stronger the acid:

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

Which of the following increases the strength of a binary acid, HY?

Calculate the pH of a 0.800 mol L-1 NaCH3CO2 solution. Ka for acetic acid, CH3CO2H, is 1.8 × 10-5.

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Filters

What is the pH of pure water at 40.0 °C if the K_w at this temperature is 2.92 × 10^-14?

An aqueous solution at 25.0 °C contains [H⁺] = 0.085 mol L^-1. What is the pH of the solution?

What is the conjugate base of H₂PO₄⁻?

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

Determine the pH of a 0.461 mol L^-1 C₆H₅CO₂H solution if the K_a of C₆H₅CO₂H is 6.5 × 10^-5.

Calculate the pH of a 0.800 mol L^-1 NaCH₃CO₂ solution. K_a for acetic acid, CH₃CO₂H, is 1.8 × 10^-5.