MCQ
Which of the following would increase the solubility of $Pb(OH)_2$
- ✓Add hydrochloric acid
- BAdd a solution of $Pb(NO_3)_2$
- CAdd a solution of $NaOH$
- DNone of the above the solubility of a compound is constant at constant temperature
✓
Answer
Correct option: A.
Add hydrochloric acid
a
$Pb ( OH )_2+2 HCl \longrightarrow PbCl _2+2 H _2 O$
$Pb ( OH )_2+2 HCl \longrightarrow PbCl _2+2 H _2 O$
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.
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