Question

A potassium hydroxide solution has a pH of 12.90. Enough cid is added to react with half of the OH- ions present. What is the pH of the resulting solution? Assume that the products of the neutralization have no effect on pH and that the amount of additional water produced is negligible.

Answer 1

Convert pH 12.90 to H^+.
OH^- are added to neutralize half of that so divide oringial H^+ by 2.
Convert the resulting H^+ to pH.

Answer 2

13.2