A 35.00mL solution of 0.2500 M HF is titrated with a standardized 0.1453 M solution of NaOH at 25 C. (a) What is the pH of the HF solution before

A 35.00−mL solution of 0.2500 M HF is titrated with a standardized 0.1453 M solution of NaOH at 25°C.

(a) What is the pH of the HF solution before titrant is added?

Answer: 1.88

(b) How many milliliters of titrant are required to reach the equivalence point?

 Answer: 60.22

STUCK here

(c) What is the pH at 0.50 mL before the equivalence point?

(d) What is the pH at the equivalence point?

(e) What is the pH at 0.50 mL after the equivalence point?