Question

A 500.0 mL buffer solution of 0.10 M hydrofluoric acid and 0.10 M potassium fluoride has an initial pH equal to 3.18 (this is the pH of the buffer solution before addition). What is the pH of the buffer solution after the addition of 0.010 moles of potassium hydroxide, KOH?

Hint: Think about what is in the buffer before the addition and think about the starting molarities? What is significant about this and what value can you find from this buffer's pH before the addition?

A) 3.00'

B) 3.16

C) 3.36

D) 3.20

2) What volume of 0.2478 M sulfuric acid is required to neutralize 10.0 mL of 0.2662 M potassium hydroxide, KOH?

A) 5.37 mL

B) 10.7 mL

C) 10.0 mL

D) 21.5 mL