Aqueous solution of \( \mathrm{HNO}_{3}, \mathrm{KOH}, \mathrm{CH}_{3} \mathrm{COOH} \) and \( \....

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Aqueous solution of \( \mathrm{HNO}_{3}, \mathrm{KOH}, \mathrm{CH}_{3} \mathrm{COOH} \) and
\( \mathrm{P} \)
\( \mathrm{CH}_{3} \mathrm{COONa} \) of identical concentrations are provided. The pair(s) of solutions which form a buffer upon mixing is (are):
(1) \( \mathrm{HNO}_{3} \) and \( \mathrm{CH}_{3} \mathrm{COOH} \)
(2) \( \mathrm{KOH} \) and \( \mathrm{CH}_{3} \mathrm{COONa} \)
(3) \( \mathrm{HNO}_{3} \) and \( \mathrm{CH}_{3} \mathrm{COONa} \)
(4) \( \mathrm{CH}_{3} \mathrm{COOH} \) and \( \mathrm{CH}_{3} \mathrm{COONa} \)


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