Question

$AgNO_{3\left(aq\right)}$ 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 $AgNO_{3}$ is

• A. $P$
• B. $Q$
• C. $R$
• D. $S$

Answer 1

Answer: (D)

When $AgNO_{3}$ reacts with $KCl$,
$AgNO_{3\left(aq\right)} +KCl_{\left(aq\right)} \to AgCl_{\left(s\right)} +KNO_{3\left(aq\right)}$
i,.e, $Ag^{+} +K^{+} +Cl^{-} +NO_{3}^{-} \to KNO_{3} +AgCl$
In this titration, initially the conductance does not change very much because the $Cl^{-}$ ions are replaced by $NO_{3}^{-}$ 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.