Oxalic acid, H2C2O4• is a diprotic acid with K1 = 5 X 10-2 and K2 = 5 X 10-5. ?

Question

Which of the following is equal to the equilibrium constant for the reaction represented below?

a. 5 x 10-2

b. 5 X 10-5

c. 2.5 X 10-6

d. 5 X 10-7

e. 2.5 x 10-8

Answer 1

c. 2.5 X 10-6

if the missing equation is :

H2C2O4 --> 2 H+  &    (C2O4)-2