1. Calculate the pH of a solution that is .15 M Na2HPO4(aq) and .44 M Na3PO4(aq). Not sure how to solve it. The ka1 of H3PO4 is 7.6 x 10^-3, pKa1 is 2.12, ka2 is 6.2 x 10^-8, pka2 is 7.21, ka3 is 2.1 x 10^-13, pka3 is 12.68.
2. Calculate the pH that results from mixing .173 L of .089 M (CH3)2NH(aq) with .343 L of .055 M (CH3)2NH2Cl(aq).