Calculate the concentrations of H2C2O4, HC2O4−, C2O42−, and H+ species in a 0.250 M oxalic acid solution (Ka1 = 6.5 × 10−2, Ka2 = 6.1 × 10−5). Report your answers to 2 significant figures.

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Explanation:

C2H2O4 C2HO4- + H+

0.175 - x x x + y

C2HO4- c2o42– + H+

x - y y x + y

K2 = (y) (x +y) / (x-y)

As, y << x

So, K2 = (y) (x) / (x)

K2 = y =6.1 × 10^–5

Hence, concentration of (c2o42–) 6.1 × 10^–5 M

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