Question: An acidic buffer is obtained on mixing :
$100 \mathrm{~mL}$ of $0.1 \mathrm{M} \mathrm{CH}_{3} \mathrm{COOH}$ and $100 \mathrm{~mL}$ of $0.1 \mathrm{M} \mathrm{NaOH}$
$100 \mathrm{~mL}$ of $0.1 \mathrm{M} \mathrm{HCl}$ and $200 \mathrm{~mL}$ of $0.1 \mathrm{M} \mathrm{NaCl}$
$100 \mathrm{~mL}$ of $0.1 \mathrm{MCH}_{3} \mathrm{COOH}$ and $200 \mathrm{~mL}$ of $0.1 \mathrm{MNaOH}$
$100 \mathrm{~mL}$ of $0.1 \mathrm{MHCl}$ and $200 \mathrm{~mL}$ of $0.1 \mathrm{M} \mathrm{CH}_{3} \mathrm{COONa}$
Correct Option: , 4
Solution:
Buffer solution contains $\mathrm{CH}_{3} \mathrm{COONa}$ (10 millimole) and $\mathrm{CH}_{3} \mathrm{COOH}$ (10 millimole) which is a acidic buffer.
