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6-2.Equilibrium-II (Ionic Equilibrium)
medium
Which of the following would increase the solubility of $Pb(OH)_2$
A
Add hydrochloric acid
B
Add a solution of $Pb(NO_3)_2$
C
Add a solution of $NaOH$
D
None of the above the solubility of a compound is constant at constant temperature
Solution
$Pb ( OH )_2+2 HCl \longrightarrow PbCl _2+2 H _2 O$
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.
Standard 11
Chemistry
