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Buffer help please

Equal volumes of equimolar solutions of the following pairs of substances are mixed. Which pair makes a buffer solution?

A) Ammonia and ammonium chloride
B) Hydrochloric acid and sodium hydroxide
C) Hydrochloric acid and sodium chloride

The answer is B but I put A? Would A not be correct as it makes a basic buffer?
Reply 1
Original post by anactualmess
Equal volumes of equimolar solutions of the following pairs of substances are mixed. Which pair makes a buffer solution?

A) Ammonia and ammonium chloride
B) Hydrochloric acid and sodium hydroxide
C) Hydrochloric acid and sodium chloride

The answer is B but I put A? Would A not be correct as it makes a basic buffer?

The Q doesn't specify which type (acid or basic) buffer you are trying to prepare.
so then how would A be wrong?
Original post by Pigster
The Q doesn't specify which type (acid or basic) buffer you are trying to prepare.
Original post by anactualmess
so then how would A be wrong?


A is the correct answer
Original post by anactualmess
so then how would A be wrong?

You need a weak acid and its conjugate base or a weak base and its conjugate acid. Hydrochloric acid is a strong acid so it is not B or C, it is A like you said.

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