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What concentartion of Ac^(-) ions will r...

What concentartion of `Ac^(-)` ions will reduce `H_(3)O^(+)` ion to `2 xx 10^(-4) M` in `0.40 M` solution of `HAc ? [K_(a) (HAc) = 1.8 xx 10^(-5)]` Given your answer after multiplying by 1000.

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