First slide

Acidic buffer

Question

A buffer solution contains a weak acid HA and A^- . When small quantity of NaOH is added to keep pH as constant, which of the following reaction takes place?

Moderate

A

$\large HA\, \to \,{H^ + }\, + \,{A^ - }$
B

${H^ + } + {A^ - }\, \to \,HA$
C

$HA + O{H^ - }\, \to \,{H_2}O\, + \,{A^ - }$
D

${A^ - } + {H_2}O\, \to \,HA\, + \,O{H^ - }$

Solution

When NaOH is added, [OH¯] increases
$NaOH\xrightarrow{{}}N{a^ + } + O{H^ - }$
$HA \rightleftharpoons {H^ + } + {A^ - }$
The incoming OH^- will be neutralised by the H⁺ furnished from the above equilibrium.

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