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Oxalic acid is a diprotic acid that occurs naturally in some plants. Calculate the pH and...

Oxalic acid is a diprotic acid that occurs naturally in some plants. Calculate the pH and the concentrations of all species present in a 0.96-M solution. The acid dissociation constants are K1 = 5.9 10-2 and K2 = 6.4 10-5.

I have part A but i cannot get part B,C or D

a.) [C2O4H2] .71 correct

b.) [C2O4H − ]

C.)[C2O42-]

D.) pH

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