Chemistry B Final Exam. Practice

In the reaction CH₃COOH + H₂O ↔ ₃O⁺ + CH₃HOO^-, what is the conjugate base?

• H₃O⁺

• CH₃COO^-

• H₂O

•  

  CH₃COOH

Answer explanation

CH₃COO^-

In an exactly 0.2 M solution of a monoprotic weak acid, [H+]=7.65 x 10^-4 M.  What is the K_a for this acid?|

• 2.9 x 10^-6

• 3.8 x 10^-5

• 3.8 x 10^-6

• 4.4 x 10^-3

What is the molarity of HCl if 23.4 ml is completely neutralized by 43.7 ml of 0.19 M NaOH?

• .35 M

• 0.15 M

• 0.12 M

• 0.24 M

Answer explanation

.35 M

What is the [H⁺] of a solution if the pH=5.7?

• 1.6 x 10^-4 M

• 5.2 x 10^-6 M

• 2.0 x 10^-6 M

• 3.8 x 10^-4 M

Answer explanation

2.0 x 10^-6 M

A strong acid is defined how?

• Strong acids are those which ionize 100% in solution.

• Strong acids are those which react with bases.

• Strong acids are those with pH values less than 3.

• Strong acids are those which  can burn skin.

Answer explanation

Strong acids are those which ionize 100% in solution.

If the hydroxide ion concentration of an aqueous solution is 3.8 x 10^-5 M, what is the [H⁺] in the solution?

• 2.5 x 10^-11M

• 2.6 x 10^-10M

• 2.6 x 10^-9M

• 1.5 x 10^-9M

Answer explanation

2.6 x 10^-10M

A solution of a weak acid and one of its salts or a weak base and one of its salts will resist changes in pH when small amounts of acid or base are added.  Such solutions are known as what?

• buffer solutions

• strong acids

• strong bases

• saturated solutions

Answer explanation

buffer solutions

What is the pH of a salt in solution?

• basic

• acidic

• acidic, basic or neutral

• neutral

Answer explanation

acidic, basic or neutral

One of the products of a neutralization reaction is usually water. What is the other product called?

• a base

• an electrolyte

• a salt

• an acid

Answer explanation

a salt

According to the Arrhenius theory, an acid is any substance which does what?

• Ionizes to produce hydroxide ions.

• Tastes sour.

• Has a pH lower than 7.

• Ionizes to produce hydrogen ions

Answer explanation

Ionizes to produce hydrogen ions