What is the formula for the pH of the salt of a weak acid and a strong base..? Is it (pkw+pka+ logc)/2 or (pkw-pka-log c )/2 or (pkw+pka- logc)/2 Share with your friends Share 0 Megha Sharma answered this Dear student, The answer is pH = ( pKw + pKa + log C) / 2 Regards 0 View Full Answer