\( 50 \mathrm{~mL} \) of \( 0.2 \mathrm{M} \) solution of an acid \( \mathrm{HA}\left(\mathrm{K}...

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\( 50 \mathrm{~mL} \) of \( 0.2 \mathrm{M} \) solution of an acid \( \mathrm{HA}\left(\mathrm{K}_{\mathrm{a}}=10^{-5}\right) \& 50 \mathrm{~mL} \) of a \( \mathrm{NaA} \) solution are given. What should be the concentration of \( \mathrm{NaA} \) solution to make a buffer solution with \( \mathrm{pH}=4 \) upon mixing the two ?
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