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Equilibrium constants at 25 ∘C are listed in the table below. Substance Kc Value of Kc...

Equilibrium constants at 25 ∘C are listed in the table below.

Substance Kc Value of Kc
CaCO3 Ksp 4.5×10−9
H2CO3 Ka1 4.3×10−7
Ka2 5.6×10−11

What is the molar solubility of marble (i.e., [Ca2+] in a saturated solution) in normal rainwater, for which pH=4.20?

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