The Ka values of H3PO4 are shown below.

Question

Ka1 7.5 multiplied by 10-3
Ka2 6.2 multiplied by 10-8
Ka3 4.8 multiplied by 10-13

What is the pH of a 0.14 M solution of Na2HPO4?

Answer 1

(H^+) = sqrt(k2k3)
pH = -log (H^+)

Answer 2

thanks!