Quiz | Buffers and Titration of Acids and Bases

1

What is not a condition to apply the Henderson-Hasselbalch equation?

pKa should be in the range of about 4 to 11

pH should be in the range of 0 to 14

The ratio [base]0/[acid]0 must be between 0.1 and 10

The values of [base]0 and [acid]0 should be in the range of 10-3 M to 1 M

2

Which of the following statements about an acid-base buffer solution is correct?

The pH of a buffer solution does not change when the solution is diluted

The pH changes very little when a small amount of strong acid or base is added to it

It can be prepared by combining a weak base with its conjugate acid

All of the above

3

What is the pH of a buffer solution where [HA] = [A-]?

pH = 1.0

pH = 7.0

pH = pKa

pH = pOH

4

When is there a large change in pH during a strong acid-strong base titration?

When pH = pKa

When the midpoint is reached

When the volume of acid = the volume of base

When the number of moles of acid = the number of moles of base

5

What titration corresponds to a titration curve with an initial pH of 9.5 and an equivalence point at pH 4.5?

Weak base to which strong acid is added

Weak acid to which strong base is added

Strong base to which strong acid is added

Strong acid to which strong base is added

6

How many equivalence points do you expect for the titration of H3PO4 with NaOH?

1

2

3

4