Which from following mixtures in water acts as a basic buffer?

Which from following mixtures in water acts as a basic buffer?
  1. $\mathrm{NH}_4 \mathrm{OH}+\mathrm{NH}_4 \mathrm{Cl}$
  2. $\mathrm{C}_6 \mathrm{H}_5 \mathrm{COOH}+\mathrm{C}_6 \mathrm{H}_5 \mathrm{COONa}$
  3. $\mathrm{HCOOH}+\mathrm{HCOOK}$
  4. $\mathrm{CH}_3 \mathrm{COOH}+\mathrm{CH}_3 \mathrm{COONa}$

Solution

Basic buffer is the mixture of weak base and its salt with strong acid. In option $\mathrm{A}, \mathrm{NH}_4 \mathrm{OH}$ is weak base and $\mathrm{NH}_4 \mathrm{Cl}$ is salt of strong acid and weak base. Hence, $\mathrm{NH}_4 \mathrm{OH}+\mathrm{NH}_4 \mathrm{Cl}$ is basic buffer. Other options are examples of acidic buffer.

Asked in: MHT CET 2024 (04 May Shift 1)

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