Chemistry multi-part question

Humus acids buffer the pH-value in brown brook.

a) calculate the pH-value in a humous stream where 15mM of the organic acid H2L with pKa1 = 4.8 and pHa2 = 8.3 is assumed to decide the pH-value

b) what is the pH-value after liming if a strong base corresponding 7 x 10-4 mol OH per liter was added to the brook?

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