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Question

A solution is 0.1 M in each KCl, KBr and K­2CrO4 to this solution, solid AgNO3 is gradually added. Assuming that there is no change in the volume of the solution given, The concentration (in M) of first ion when the second ion starts precipitating is about .

Given:
Ksp of AgCl = 1.7×1010
Ksp of AgBr = 5.0×1013
Ksp (K2CrO4)=1.9×1012

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Solution

A solution is 0.1 M in each KCl, KBr and K­2 CrO4 to this solution, solid AgNO3 is gradually added. Assuming there is no change in the volume of the solution given,
Given:
Ksp of AgCl = 1.7×1010
Ksp of AgBr = 5.0×1013
Ksp (K2CrO4)=1.9×1012

[Ag]+ to start the ppt. Of Cl
=Ksp(AgCl)[Cl]=1.7×10100.1=1.7×109M
When Cl starts precipitating
[Br]=Ksp(AgBr)[Ag+]=5×10181.7×109=3×104M

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