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Q. Which one of the following is basic buffer solution?

UP CPMTUP CPMT 2015Equilibrium

Solution:

$NH_{4}OH + NH_{4}Cl$ is a buffer mixture of a weak base and its salt
This mixture contains undissociated $NH_{4}OH$ as well as $NH^{+}_{4}$ and $Cl^{-}$ ions
If a strong acid is added, $H^{+}$ ions added are neutralised by base $NH_{4}OH$
$H^{+} + NH_{4}OH \to H_{2}O + NH^{+}_{4}$
If a strong base is added, the $OH^{-}$ ions added are neutralised by $NH^{+}_{4}$ ions forming very slightly dissociated $NH_{4}OH$