Posted on January 22, 2022 by Carla[Solved] Predict the pH of a 0.0050 M solution of a weak, polyprotic acid. Ka1= 4.3 x 10^-7 Ka2= 5.6 x 10^-11 Predict the pH of a 0.0050 M solution of a weak, polyprotic acid. Ka1= 4.3 x 10^-7 Ka2= 5.6 x 10^-11