Asolution contains a weak monoprotic acid HA and
its sodium salt NaA both at 0.1 M concentration.
Show that [OH�] Kw/Ka.

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  1. Start with an equation

    HA <-> H+ + A-

    at start

    at equilibrium



    if x is small with respect 0.1 then this expression becomes

    or Ka=x




    as x=Ka then


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