Which of the following options is true for a solution saturated with AgCI and AgBr, if their solubilities in mole per litre in separate water samples are x and y respectively ? Given : x > y. Assume no hydrolysis of Ag + ion.
Text Solution
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AgCI 
Ag + + CI – ; AgBr 
Ag + + Br –
x' + y' x' x' + y' y'
(both equilibria are established simultaneously in a solution saturated with AgCl and AgBr)
[Ag + ] = [Br – ] + [CI – ]
(B, C, D)
x > y ⇒ x 2 > y 2 ⇒ K sp (AgCl) > K sp (AgBr)
Now, for simultaneous equilibrium, 
= 
( > 1).
Also, Ag + produced from each salt will exert common ion effect on the equilibrium of other.
∴ x > [CI – ] & y > [Br – ].
Also, [Ag + ] < x + y.
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