If a weak acid, ha, is 3% dissociated in a 0.25 m
solution, calculate the ka and the ph of the solution.

Ka =

pH = 2.12

Explanation:

Calculation of Ka:

% Dissociation = 3% = 0.03

Concentration of solution = 0.25 M

HA dissociated as:

      C(1 - 0.03)    C×0.03   C×0.03

HA] after dissociation = 0.25×0.97 = 0.2425 M

Calculation of pH of the solution