Aqueous solutions of HNO 3 , KOH , CH 3 COOH , and CH 3 COONa of identical concentrations are provided. The pair(s) of solutions which form a buffer upon mixing is(are)

Question

Aqueous solutions of HNO 3 ​ , KOH , CH 3 ​ COOH , and CH 3 ​ COONa of identical concentrations are provided. The pair(s) of solutions which form a buffer upon mixing is(are)

TestHub · Accepted Answer

A buffer solution requires a weak acid and its conjugate base, or a weak base and its conjugate acid.

Option A: Mixing a strong acid ( $H Cl$ ) with the salt of a weak acid ( $C H_{3} COON a$ ) can form a buffer if the strong acid is the limiting reactant, producing $C H_{3} COO H$ .

Option C: Mixing a strong acid ( $H N O_{3}$ ) with the salt of a weak acid ( $C H_{3} COON a$ ) can form a buffer if the strong acid is the limiting reactant, producing $C H_{3} COO H$ .

Option D: Mixing a weak acid ( $C H_{3} COO H$ ) with its conjugate base ( $C H_{3} COON a$ ) directly forms a buffer.

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Options:(select one or more)

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