The initial solution in a titration is 20.0 ml of a .2M HF. The hydrofluoric acid is titrated with .10M KOH in 5.0 mL volumes. pKa for HF is 3.45, Ka = .
(6) What is the initial pH?
Since not all of the weak acid dissociates, the concentration of the hydronium ions must be calculated. Denote the hydronium ion concentration by x (x then also corresponds to the amount of the acid that has dissociated).