H3PO4 Ka1 75 X 103 Ka2 62 x 108 Ka3 1 x 1012 I really don

H3PO4 Ka1 = 7.5 X 10^-3

Ka2 = 6.2 x 10^-8

Ka3 = 1 x 10^-12

I really dont understand if i should be finding Ka2 dissociation then adding it to Ka3 or combing what i get from Ka2 and Ka3 to find overall H+ concentration. Thank You

so the dissocaition of HPO4(-2) is very small, we can use Henderson-Hasselbach eqn to calculate dissociation of H2PO4-, the calculated [H+] will be the answer:
[H+] = Ka[HA]/[A-]
[H+] = 6.2 * 10^-8 (0.1)/0.2 = 3.1 * 10^-8

H3PO4 Ka1 = 7.5 X 10^-3 Ka2 = 6.2 x 10^-8 Ka3 = 1 x 10^-12 I really dont understand if i should be finding Ka2 dissociation then adding it to Ka3 or combing wha

H3PO4 Ka1 75 X 103 Ka2 62 x 108 Ka3 1 x 1012 I really don

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