An acidic buffer solution can be prepared by mixing solution of

Options

A. Sodium acetate and acetic acid
B. Ammonium chloride and ammonium hydroxide
C. Sulpuric acid and sodium sulphate
D. Sodium chloride and sodium hydroxide

Answer

A

Explanation

Acidic buffer is a mixture of a weak acid and its salt with a strong base in solution.
`CH_(3)COOH hArr CH_(3)COO^(Theta) + H^(o+)`
`CH_(3)COONararr CH_(3)COO^(Theta) = Na^(o+)`
Adding acid: When a small amount of acid is added, `H^(o+)` ions combine with acetate ions to form the weal electrolyte acetic acid that does not dissociate, so the `pH` does not change.
Adding base: When a small amount of base is added, `overset(Theta)OH` ions combine with `H^(o+)` ions to form the weak electrolyte water that does not dissociate, so the `ph` does not change.