Chemistry Assignment Help With Ionization Of Polyprotic Acids

Ionization Of Polyprotic Acids

Let us consider the ionization of H2S in its aqueous solution. It C is concentration in mole/litre C and Ka1 and Ka2 are ionization constants for first and second step ionization of H2S.

H2S H+ + HS—

C(1-x1) cx1 cx1(1 – y1) (At equilibrium)

HS H+ + S– –

cx1 (1–y1) cx1 y1 x1 y1 (At equilibrium)

because generally hence we can assume that

\ …(i)

…(ii)

From equation (i) and (ii) we can calculate the pH of aqueous solution of H2S.

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