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Question

A solution consists of a mixture of 0.01 M KI and 0.1 M KCl. If solid AgNO3 is added to the solution, what is the concentration of I when AgCl begins to precipitate?
[Ksp (AgI)=1.5×1016; Ksp (AgCl)=1.8×1010]

A
3.5×107 M
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B
6.1×108 M
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C
2.2×107 M
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D
8.3×108 M
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Solution

The correct option is B 8.3×108 M
Given that a solution is 0.01 M KI and 0.1 M KCl.

When AgCl begins to precipitate,

[Ag+][Cl]=1.8×1010=Ksp of AgCl

[Ag+]=1.8×109 as [Cl]=0.1 which comes from KCl.

Ksp of AgI is 1.5×1016.

So, at this time, [I]=Ksp[Ag+]=1.5×10161.8×109=8.3×108 M

Hence, the concentration of I when AgCl begins to precipitate is 8.3×108 M.

Hence, the correct option is D

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