Question

In conductometric titration of $AgN{O}_3$ with $KCl$ (titrant):

• A. Conductivity sharply increases until the equivalence point
• B. After equivalence point, on addition of $KCl$, the conductivity increases sharply
• C. After equivalence point, on addition of $KCl$, the conductivity remains constant
• D. Conductivity sharply decreases until the equivalence point

Answer 1

The correct option is B After equivalence point, on addition of $KCl$, the conductivity increases sharply

$KCl$ is added to a solution of $AgN{O}_3$.

Addition of $KCl$:
$AgN{O}_3\left(aq\right)+KCl\left(aq\right)\to AgCl\left(s\right)+KN{O}_3\left(aq\right)$
$A{g}^{+}$ ions are replaced by $K^{+}$ ions
No appreciable change in conductivity of the solution becuase the mobilities of $A{g}^{+}$ and $K^{+}$ ions are similar.
$AgCl$ formed, does not dissociate, till all $AgN{O}_3$ is used up.
Addition of $KCl$ after equivalence point: Conductivity increases sharply, due to addition of the strong electrolyte $KCl$

Titration of $AgN{O}_3$ with $KCl$