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A solution contains 0.09 HC1, 0.09 M CHC...

A solution contains `0.09 HC1, 0.09 M CHC1_(2)COOH`, and `0.1M CH_(3)COOH`. The `pH` of this solution is one. Calculate `K_(a)`for `CHC1_(2)COOH`. (Given `K_(a)CH_(3)COOH = 10^(-5))`

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