Chem

What is the PH of 0.40 M Na2SO3? (K1 for H2SO3 = 1.5 * 10^-2; K2 = 1.0 * 10^-7

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  1. .......SO3^2- HOH ==> HSO3^- + OH^-
    I......0.4.............0........0
    C......-x...............x.......x
    E.....0.4-x.............x........x

    Kb for SO3^2- = (Kw/K2 for H2SO3) = (HSO3^-)(OH^-)/(SO3^2-)
    Substitute from the ICE chart, solve for x = OH^-, convert to pH.

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