First slide

Common ion effect

Question

Among the following statements
a) If two salts have equal solubility then their solubility products are equal.
b) BaSO₄ is more soluble in water than in dil.H₂SO₄
c) When KI is added to PbI₂, the [Pb²⁺] decreases
d) In any solution containing AgCl, the value of [Ag⁺][Cl^-] is constant at constant temperature.

Moderate

A

all are correct
B

a, b and d are correct
C

a, c and d are correct
D

b, c and d are correct

Solution

a) Solubility product depends on the formula type of the salt [so false]
b) $\large BaS{O_4}\left( s \right) \rightleftharpoons BaS{O_4}\left( {aq} \right)\xrightarrow{{}}B{a^{ + 2}}\left( {aq} \right) + SO_4^{ - 2}\left( {aq} \right)$
In dil.H₂SO₄, $\large SO_4^{ - 2}$ ions will be present. As a result of common ion effect solubility of BaSO₄ in dil H₂SO₄ will be suppressed. [so true]
c) $\large Pb{I_2}\left( s \right) \rightleftharpoons Pb{I_2}\left( {aq} \right)\xrightarrow{{}}P{b^{ + 2}}\left( {aq} \right) + 2{I^ - }\left( {aq} \right)$
KI is a strong electrolyte and so will furnish a high concentration of I^- ions. As a result of common ion effect, solubility of PbI₂ will be suppressed. [so true]
d) $\large AgCl\left( s \right) \rightleftharpoons AgCl\left( {aq} \right)\xrightarrow{{}}A{g^ + }\left( {aq} \right) + C{l^ - }\left( {aq} \right)$
This is an equilibrium. An equilibrium is characterised by a definite tremperature. [so true]

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