Question

Which of the following would increase the solubility of $Pb(OH{)}_2$?

• A. Add hydrochloric acid
• B. Add a solution of $Pb(N{O}_3{)}_2$
• C. Add a solution of $NaOH$
• D. None of the above-the solubility of a compound is constant at constant

Answer 1

The correct option is A Add hydrochloric acid

$Pb(OH{)}_2+2HCl⟶PbC{l}_2+2H_{2}O$

By adding acid solubility of $Pb(OH{)}_2$ increases. When $HCl$ is added to $Pb(OH{)}_2$ it reacts with ${}^{-}OH$ ions and form water. ${}^{-}OH$ ions are removed from solution.

According to Le chatelier's Principle, the the position of equilibrium moves to the right to replace the ${}^{-}OH$ ions. The solubility of $Pb(OH{)}_2$ increases.