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Question

An excess of Ag2CrO4(s) is added to a 5×103M K2CrO4 solution. The concentration of Ag+ in the solution is closest to.[Solubility product for Ag2CrO4=1.1×1012]

A
2.2×1010M
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B
1.5×105M
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C
1.0×106M
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D
5.0×103M
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Solution

The correct option is B 1.5×105M
Since, K2CrO4 is a strong electrolyte so the concentration of chromate ion will be almost equal to the concentration of K2CrO4.

Ag2CrO42Ag++CrO24
S 2S 5×103 M

Now,
Ksp=[Ag+]2[CrO24]

1.1×1012=[Ag+]2[5×103]

[Ag+]=1.5×105

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