Chemistry: Quiz: Polyprotic Acids

Quiz: Polyprotic Acids

1. Polyprotic acids have how many ionizable hydrogen ions?

a. 0

b. more than 1

c. only 1

2. The K_a for the first dissociation of a polyprotic acid is always _________ compared to the K_a for the second dissociation.

a. less in value

b. greater in value

c. the same value

3. Phosphoric acid is a weak acid. Which of the following ions will be in the smallest concentration in a solution of H₃PO₄?

4. Which of the following is a polyprotic acid?

a. HCl

b. H₂CO₃

c. HBr

5. Sulfuric acid, H₂SO₄, is a diprotic acid. Which hydrogen ion is the most difficult to remove?

a. the first

b. the second

c. they are both equally difficult to remove

6. The smaller the K_b value,

a. the weaker the base

b. the stronger the base

c. more dissociation occurs