Which pair of compounds will form a buffer in aqueous solution?

NaCN and NaOH
NaCN and KCN
HCl and NaOH
HCN and HCl
HCN and NaCN
HCl and NaCl

Solutions

Expert Solution

Concepts and reason

The concept used to solve this problem is that a buffer is formed by the combination of a weak acid and its salt of a strong acid or by the combination of a weak base and its salt of a strong acid.

Fundamentals

A buffer solution is a solution that resists change in \(\mathrm{pH}\) on the addition of a strong base or a strong acid. Buffer solutions are of 2 types:

1. Acidic buffer- This is formed by weak acid and its salt of a strong base.

2. Basic buffer- This is formed by a weak base and its salt of a strong acid.

To form a buffer solution you must mix a weak acid and a weak base on an aqueous solution.
The last option: HCN and NaCN will form a buffer.

Once you put HCN and NaCN in water will occur the following molecular dissociation:
HCN -----> H+ + CN-
NaCN -----> Na+ + CN-

The HCN will act as a weak acid and NaCN as a conjugated base.

Dr. OWL answered 3 years ago

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