AgNO3 (aq.) was added to an aqueous KCl solution gradually and the conductivity of the solution was measured. The plot of conductance (Λ) versus the volume of AgNO3 is
The plot obtained on addition of AgNO3 (aq) to solution of KCl is depicted as follows.
Ag++NO3−+K++Cl− → AgCl + K++NO3− AgNO3(aq.)+K+Cl−(aq.) → AgCl(s)+KNO3 On adding aqueous AgNO3, the precipitation will not start immediately, until the ionic product of AgCl exceeds the solubility product. After that AgNO3 will be precipitated in the form of AgCl and also at the same time NO3− ions will be added to the solution. Since the number of ions remains the same, the conductance also remains the same (as shown by line AB in the figure). Once the precipitation is complete, on further addition of AgNO3, the number of ions will now increase and hence the conductance will also increase (as shown by line BC).