HOCl ↔ OCl- + H+ Ka is 3.2 x 10^-8?

Question

Hypochlorous acid, HOCl, is a weak acid commonly used as a bleaching agent. The acid dissociation constant, Ka, for the reaction represented above is 3.2 x 10-8.

c. Calculate the pH of a solution made by combining 40.0 milliliters of 0.14 molar HOCl and 10.0 milliliters of 0.56 molar NaOH.

d. How many millimoles of solid NaOH must be added to 50.0 milliliters of 0.20 molar HOCl to obtain a buffer solution that has a pH of 7.49? Assume that the addition of the solid NaOH results in a negligible change in volume.

Answer 1

I took Chemistry and these problems really take forever...good luck finding someone willing to work that whole thing out for you.  If you're having trouble with it, why not ask your teacher?