Question

$AgN{O}_{3\left(aq\right)}$ was added to an aqueous $KCl$ solution gradually ana the conductivity of the solution was measured. The plot of conductance $\left(\wedge \right)$ versus the volume of $AgN{O}_3$ is

• A. $P$
• B. $Q$
• C. $R$
• D. $S$

Answer 1

Answer: (D)

When $AgN{O}_3$ reacts with $KCl$,
$AgN{O}_{3\left(aq\right)}+KC{l}_{\left(aq\right)}\to AgC{l}_{\left(s\right)}+KN{O}_{3\left(aq\right)}$
i,.e, $A{g}^{+}+K^{+}+C{l}^{-}+N{O}_3^{-}\to KN{O}_3+AgCl$
In this titration, initially the conductance does not change very much because the $C{l}^{-}$ ions are replaced by $N{O}_3^{-}$ ions; both have almost same ionic conductances. After the end point is passed, the excess of the added (i.e., addition of volume of reagent) salt causes a sharp increase in the conductance.