a relation between the equilibrium constant for the hydrolysis reaction (hydrolysis constant) and the dissociation constant of the acid. XII U8-Ionic XII U8-Ionic - - - - K = [CH COOH][OH ] [CH COO ][H O] h K = [CH COOH][OH ] [CH COO ] h .....( ) CH COOH (aq) CH COO (aq) + H (aq) K = [CH COO ][H ] [CH COOH] a .....( ) ( ) ( ) K .K =[H ][OH ] we know that [H ][OH ]=K K .K =K h a w h a ⇒ w K h value in terms of degree of hydrolysis (h) and the concentration of salt (C) for the equilibrium can be obtained as in the case of ostwald's dilution law. K = h C. h and i.e [OH ]= K .C h pH of salt solution in terms of K a and the concentration of the electrolyte.
pH + pOH = pH = - p OH = - {-log [OH ]} = + log [OH - ] ∴ pH = + log (K C) pH = + log K C K pH = + h w a log K + log C - log K pH = - + log C w a