Phosphoric acid, H3PO4(aq),H3PO4(aq), is a triprotic acid, meaning that one molecule of the acid has three acidic protons. Estimate the pH, and the concentrations of all species in a 0.500 M0.500 M phosphoric acid solution.

a1Ka1	a2Ka2	a3Ka3
6.9x10-3	6.2x10-8	4.8x10-13

[H3PO4]=[H3PO4]=

MM

[H+]=[H+]=

MM

[H2PO4]=[H2PO4]=

MM

[OH]=[OH]=

MM

[HPO24]=[HPO42]=

MM

pH=pH=

[PO34]=[PO43]=

M