Question

question 31 (1 point)
which of the following combinations will not result in the formation of a buffer solution?
ethanoic acid-sodium acetate
formic acid-sodium formate
ethanoic acid-hydrochloric acid
boric acid-sodium borate
ammonia-ammonium chloride

Explanation:

A buffer solution is made of a weak acid and its conjugate base (or a weak base and its conjugate acid). Ethanoic acid (weak acid) and hydrochloric acid (strong acid) don't form a conjugate acid - base pair. The other options have a weak acid and its conjugate base (ethanoic acid - sodium acetate, formic acid - sodium formate, boric acid - sodium borate) or a weak base and its conjugate acid (ammonia - ammonium chloride). So ethanoic acid - hydrochloric acid won't form a buffer.

Answer:

Ethanoic acid - hydrochloric acid