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10ml of 0.1M weak acid HA(K(a) = 10^(-5)...

`10ml` of `0.1M` weak acid `HA(K_(a) = 10^(-5))` is mixed with 10 ml `0.2 M HCI` and `10ml 0.1 M NaOH`. Find the concentration of `A^(-)` in the resulting solution. Write your answer as `(-log [A^(-)])`

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