Question

Solid Lead nitrate is dissolved in 1 litre of water. The solution was found to boil at 100.15ºC. When 0.2 mol of NaCl is added to the resulting solution, it was observed that the solution froze at –0.8º C. The solutbility product of PbCl₂ formed is _____ × 10^-6 at 298 K. (Nearest integer)

Given : K_b = 0.5 K kg mol^-1 and K_f = 1.8 kg mol^-1 . Assume molality to be equal to molarity in all cases

Answer 1

Correct answer is 13

Let a mole Pb(NO₃)₂ be added