Question

Malonic acid, H2C3H2O4, is a diprotic acid, with the following acid dissociation constants. Ka1 = 1.4...

Malonic acid, H2C3H2O4, is a diprotic acid, with the following acid dissociation constants. Ka1 = 1.4 × 10–3Ka2 = 2.0 × 10–6 Calculate the amount of HC3H2O4‒ present in a 0.80 M H2C3H2O4(aq) solution.

A.3.3 × 10‒2M

B.1.3 × 10‒3M

C.2.6 × 10‒4M

D.2.0 × 10‒6M

When I solved this problem I found that K1=3.3x10^-2, and K2=1.3x10^-3. My question is how can you tell which Ka is correct? How can you pick when both answers are listed?

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