Naturally occurring rainwater is acidic due to the presence of carbonic acid, H2CO3, produced when CO2(g) dissolves in water. Carbonic acid is a diprotic acid with Ka1 = 3 x 10-7 and Ka2 = 4.7 x 10-11. What is the pH of rainwater if the [H2CO3] is 1.2 x 10-5 M?

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