Question

Aqueous solutions of $HNO_3 \, KOH, \, CH_3COOH$ and $CH_3COONa$ of identical concentrations are provided. The pair(s) of solutions which form a buffer upon mixing is(are)

• A. $HNO_3 and CH_3COOH$
• B. $KOH and CH_3COONa$
• C. $HNO_3 and CH_3COONa$
• D. $CH_3COOH and CH_3COONa$

Answer 1

Answer: (D)

$CH_3COOH and CH_3COONa$

Answer 2

In $HNO_3 \, and \, CH_3COONa$ combination, if $HNO_3$
is present in limiting amount, it will be neutralised
completely, leaving behind some excess of $CH_3COONa.$