Question

A buffer solution can be prepared from a mixture of

• A. sodium acetate and acetic acid in water
• B. sodium acetate and HC1 in water
• C. ammonia and ammonium chloride in water
• D. ammonia and sodium hydroxide in water

Answer 1

Answer: (C)

ammonia and ammonium chloride in water

Answer 2

$CH_3COOH + CH_3COONa$ = Buffer solution
$CH_3COONa + HCl \longrightarrow CH_3COOH + NaCl$
If HCl is taken in limited quantity, final solution will have both $CH_3COOH$ and $CH_3COONa$ needed for buffer solution.
Ammonia and ammonium chloride forms basic buffer