Answer
Please see the work below.
Work Step by Step
We know that the expression fro $K$ is given as
a. $K=K_p=PCO_2$
b. $K=K_{sp}=[Pb^{+2}][I^{-2}]$
c. $K=\frac{PCO_2}{[H^{+}][HCO_3^{-}]}$
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