Which from following mixtures in water acts as a buffer?

Which from following mixtures in water acts as a buffer?
  1. Acetic acid and sodium acetate
  2. Acetic acid and ammonium chloride
  3. Ammonium hydroxide and sodium chloride
  4. Formic acid and acetic acid

Solution

Acetic acid is a weak acid and sodium acetate is a salt of weak acid and strong base. Thus, it acts as a buffer solution in water.

Asked in: MHT CET 2024 (16 May Shift 1)

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