Question

Which of the following will form a buffer solution?
(a) $C{H}_{3}COONa+C{H}_{3}COOH$
(b) $NaCl+NaOH$
(c) $N{H}_{4}Cl+N{H}_{4}OH$
(d) $N{a}_{2}S{O}_4+H_{2}S{O}_4$

• A. A, B
• B. B, C
• C. A, C
• D. A, D

Answer 1

The correct option is C A, C

Buffer solution: A buffer solution is an aqueous solution consisting of a mixture of a weak acid and its conjugate base or weak base and its conjugate acid.
Acidic buffer solution: Acidic buffer are solution of a mixture of weak acid and salt of its conjugate base of that acid with a strong base.
Basic bufer solution: Basic buffer are solution of a mixture of weak base and salt of its conjugate acid of that base with a strong acid.
a)$(C{H}_{3}COONa+C{H}_{3}COOH)$ forms acidic buffer as it is a mixture of weak acid and salt of its conjugate base with strong base .
b) $(NaCl+NaOH)$ is not a buffer solution as $NaOH$ is a strong base.
c) $(N{H}_{4}Cl+N{H}_{4}OH)$ forms basic buffer as it is a mixture of weak base and salts of its conjugate acid with strong acid.
d) $(N{a}_{2}S{O}_4+H_{2}S{O}_4)$ is not a buffer solution as $H_{2}S{O}_4$ is a strong acid.
hence option (A, C) is correct.