Oxalic acid is a relatively strong diprotic acid with Ka1 = 5.6 ´ 10-2 and Ka2 = 5.1 ´ 10-5.

Question

What is the oxalate ion, C2O42-, concentration in a 0.10 M oxalic acid solution?

a. 0.052

b. 0.073

c. 0.10

d. 5.6 ´ 10-2

e. 5.1 ´ 10-5