Addition of conc. HCl to saturated BaC l_2 solution precipitates … - Vidyadip

MCQ

Addition of conc. $HCl$ to saturated $BaC{l_2}$ solution precipitates $BaC{l_2}$; because

A
It follows from Le Chatelier’s principle
B
Of common-ion effect
✓
Ionic product $(B{a^{ + + }}),$$(C{l^ - })$remains constant in a saturated solution
D
At constant temperature, the product $(B{a^{2 + }}),$ ${(C{l^ - })^2}$ remains constant in a saturated solution

✓

Answer

Correct option: C.

Ionic product $(B{a^{ + + }}),$$(C{l^ - })$remains constant in a saturated solution

c
When you add a compound having a common ion, It decreases the solubility of the solute. This is because Le Chatelier's principle states the reaction will shift toward the left (toward the reactants) to relieve the stress of the excess product.

This is called common-ion effect. due to this effect, some solute becomes insoluble and precipitate.

In the above case $HCl$ and $BaCl _2$ have $Cl ^{-}$ common ions and thus $BaCl _2$ precipitates.

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