Calculate the pH of a 0.60 mol L^-1 H₂SO₃ solution that has the stepwise dissociation constants K_a1 = 1.5 × 10^-2 and K_a2 = 6.3 × 10^-8. A)1.02 B)1.06 C)1.82 D)2.04

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Quizplus · Accepted Answer

The first dissociation of H2SO3 is the major contributor to the H+ concentration. Using the formula for weak acid dissociation, [H+] = √(Ka1 × C), where C is the concentration of the acid, we find [H+] = √(1.5 × 10^-2 × 0.60) = 0.094. The pH is then calculated as -log(0.094) ≈ 1.02.

Calculate the PH of a 0