A hydrogen electrode placed in a buffer solution of \( \mathrm{CH}_{3} \mathrm{COONa} \) and \( ...
A hydrogen electrode placed in a buffer solution of \( \mathrm{CH}_{3} \mathrm{COONa} \) and \( \mathrm{CH}_{3} \mathrm{COOH} \) in the ratio's \( x: y \) and \( y: x \) has electrode potential values \( E_{1} \) and \( E_{2} \) volts, respectively, at \( 25^{\circ} \mathrm{C} \). The \( \mathrm{p} K_{\mathrm{a}} \) value of acetic acid is
(a) \( \left(E_{1}+E_{2}\right) / 0.118 \)
(b) \( \left(E_{2}-E_{1}\right) / 0.118 \)
(c) \( -\left(E_{1}+E_{2}\right) / 0.118 \)
(d) \( \left(E_{1}-E_{2}\right) / 0.118 \)
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