Question

Which one of the following is salt buffer ?

• A. $\left(N{H}_{4}CN\right)$ solution
• B. $(C{H}_{3}COON{H}_4,)$ solution
• C. (a) and (b) above.
• D. None of the above

Answer 1

The correct option is C (a) and (b) above.

A solution of the salt of weak acid and weak base in water is called salt buffer.
a) Ammonium acetate $\left(C{H}_{3}COON{H}_4\right)$ solution is a salt of weak acid $\left(C{H}_{3}COOH\right)$ and weak base $\left(N{H}_{4}OH\right)$ in water.
b) Ammonium cyanide $\left(N{H}_{4}CN\right)$ solution is a salt of weak acid $\left(HCN\right)$ and weak base $\left(N{H}_{4}OH\right)$ in water.
Hence both (a) and (b) option are correct.