Kaplan question dealing with molar solubility

[TheWiredNerv]

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Hey all, I got this question dealing with the solubility of AgI in water. They give the Ksp of AgI to be 8.5 x 10 ^ -17. Now they have possible answer choices but choice E is None of the Above. I thought the answer would be that because AgI is insoluble in water but apparently that is the wrong answer. Doing the calculations for the problem the answer turned out to be 9.2 x 10 -9 M. Now why this would be the answer, I have no idea. Isn't AgI not suppose to dissociate at all? Thanks for the help!

 

[llopop]

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You're confusing chemistry with chem language. An ion bonded to Ag is considered insoluable because a very very small amount will dissoicate in water (look at the KSP value for this). However, although considered insoluable, if given only this reagent it is still possible to figure out the extend that it will disciate (chemistry). Note: When you have reagent like this along with others the concentration of the Ag ion and whatever it is bonded to can be ignored because it is so small. I believe thats why you thought the answer was zero. cherio.

 

[TheWiredNerv]

I see! Thank you very much for the clarity.

 

[vmaggio]

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