Calculate \( \mathrm{OH}^{-} \)concentration at the equivalent point when a solution of \( 0.1 \...

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Calculate \( \mathrm{OH}^{-} \)concentration at the equivalent point when a solution of \( 0.1 \mathrm{M} \) acetic acid is titrated with a solution of \( 0.1 \mathrm{M} \mathrm{NaOH} \). \( \mathrm{K}_{\mathrm{a}} \) for the acid \( =1.9 \times 10^{-5} \).
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