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6-2.Equilibrium-II (Ionic Equilibrium)
medium
एक उभय प्रतिरोधी (buffer) विलयन को निम्न में से किसके समान आयतन के मिश्रण द्वारा बनाया जा सकता है?
A$0.2\, M \,NH _{4} OH$ और $0.1\, M\, HCl$
B$0.2\, M \,NH _{4} OH$ और $0.2\, M \,HCl$
C$0.2 \,M \,NaOH$ और $0.1 \,M\, CH _{3}\, COOH$
D$0.1 \,M\, NH _{4} OH$ और $0.2\, M\, HCl$
(KVPY-2018)
Solution
(a) The solutions which resist change in $pH$ on dilution or with the addition of small amounts of acid or alkali are called buffer solution. It is a mixture of weak base with its salt or weak acid with its salt.
Thus, buffer solution can be prepared by mixing equal volumes of $0.2\, M\, NH _{4} OH$ (weak base) and $0.1 \,M\, HCl$ (strong acid). lt results in the formation of $NH _{4} OH$ (weak base) $+ NH _{4} Cl$ (salt of weak base $\left.NH _{4} OH \right)$, which is a basic buffer mixture.
Thus, buffer solution can be prepared by mixing equal volumes of $0.2\, M\, NH _{4} OH$ (weak base) and $0.1 \,M\, HCl$ (strong acid). lt results in the formation of $NH _{4} OH$ (weak base) $+ NH _{4} Cl$ (salt of weak base $\left.NH _{4} OH \right)$, which is a basic buffer mixture.
Standard 11
Chemistry
