Question

Solid Lead nitrate is dissolved in 1 litre of water. The solution was found to boil at $100.15\degree C$. When 0.2 mol of NaCl is added to the resulting solution, it was observed that the solution froze at $–0.8\degree C$. The solubility product of PbCl2 formed is ________ $\times 10^{–6}$ at 298 K. (Nearest integer) Given: $Kb = 0.5 K \text{ kg mol}^{–1}$ and $Kf = 1.8 K \text{ kg mol}^{–1}$.
Assume molality to be equal to molarity in all cases.

Answer 1

The correct answer is 13