chemistry

Calculate the concentration of all species in a 0.20 M KF solution.

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  1. K^+ is 0.2M
    ......F^- + HOH ==> HF + OH^-
    I....0.2............0.....0
    C.....-x............x.....x
    E...0.2-x...........x.....x

    Kb for F^- = (Kw/Ka for HF) = (x)(x)/(0.2-x)
    Solve for x = (HF) = (OH^-)
    You have OH^-, then Kw = (H^+)(OH^-) so you can solve for (H^+).
    All of that gives you K, HF, OH, H and F. Note F = 0.2-x)

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