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Malonic acid is a diprotic acid. The successive equilibrium constants are $1.5 × 10^{–3}(K_{a1})$ and $2.0 × 10^{–6}(K_{a2})$.

What is the equilibrium constant for the complete dissociation of malonic acid?

A

$1.5 × 10^{-3}$

B

$7.5 × 10^{-4}$

C

$2.0 × 10^{-6}$

D

$3.0 × 10^{-9}$

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