Calculate \( \left[\mathrm{H}^{+}\right] \)in a \( 0.2 \mathrm{M} \...

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Calculate \( \left[\mathrm{H}^{+}\right] \)in a \( 0.2 \mathrm{M} \) solution of dichloroacetic acid \( \left(\mathrm{K}_{\mathrm{a}}=5 \times 10^{-2}\right) \) that also contains \( 0.05 \mathrm{M} \mathrm{H}_{2} \mathrm{SO}_{4} \). Report your answer after multiplying it by 400 .
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