A solution of NaOH with pH 13.68 requires 35.00 mL of 0.128 M HClO_4_ to reach the equivalence point. What is the volume of the NaOH solution?

Answer 1

Convert pH 13.68 to OH^- (which will be in moles/L or M), then
mL NaOH x M NaOH = mL HClO4 x M HClO4.

Answer 2

How do I do convert the pH to the OH?

Answer 3

Answered above.