Why does adding sodium chloride to a saturated solution of lead chloride reduce the solubility of pbvi2?

B) Equilibrium is pushed towards the left in the equation

PbCl2 -> Pb+2 + 2Cl-

Explanation:

We have a saturated solution of PbCl2. It means the maximum amount of PbCl2 is dissolved in the solution. If we add sodium Chloride - NaCl, the solubility will be reduced.

NaCl will dissolve into the solution forming Na+ and Cl- ions. Cl- ions are common for the PbCl2 and NaCl. The effect of increasing Cl- ions due to the NaCl will reduce the solubility of PbCl2.

It means if we add Cl- ions or Pb+2 ions independent from the component apportioning them, the solubility will be reduced for the PbCl2, and the equilibrium will be pushed towards the left in the equation

PbCl2 -> Pb+2   + 2Cl-

Finally, we can conclude that the answer is B) Equilibrium is pushed towards the left in the equation:

PbCl2 -> Pb+2   + 2Cl-

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