Equilibrium Question 188

Question: The solubility of AgCl in 0.2MNaCl solution (Ksp for AgCl=1.20×1010) is [MP PET 1996]

Options:

A) 0.2M

B) 1.2×1010,M

C) 0.2×1010,M

D) 6×1010,M

Show Answer

Answer:

Correct Answer: D

Solution:

AgCla,Ag+a,+Cla,

NaCl0.02,Na+0.02,,+Cl0.02,

KspAgCl=1.20×1010

KspAgCl=[Ag+][Cl]

=a×[a+0.2]

=a2+0.2a

a2 is a very small so it is a neglected. KspAgCl=0.2a

1.20×1010=0.2a

a=1.20×10100.20=6×1010 mole



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