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\( \left[\mathrm{H}^{+}\right]=\sqrt{\frac{\mathrm{K}_{\mathrm{W}} \mathrm{K}_{\mathrm{a}}}{\mathrm{C}}} \) is suitable for
\( \mathrm{P} \)
W
(1) \( \mathrm{NaCl}, \mathrm{NH}_{4} \mathrm{Cl} \)
(2) \( \mathrm{CH}_{3} \mathrm{COONa}, \mathrm{NaCN} \)
(3) \( \mathrm{CH}_{3} \mathrm{COONa},\left(\mathrm{NH}_{4}\right)_{2} \mathrm{SO}_{4} \)
(4) \( \mathrm{CH}_{3} \mathrm{COONH}_{4},\left(\mathrm{NH}_{4}\right)_{2} \mathrm{CO}_{3} \)
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