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Chemistry Forums for Students => Analytical Chemistry Forum => Topic started by: venous on October 29, 2007, 02:31:04 PM

Title: fractional preciptation
Post by: venous on October 29, 2007, 02:31:04 PM
hi  :)
now if in this question " write short notes on fractional precipitation "  was in my exam I'd answer :
fractional precipitation means the removal of some ions from solution with precipitation while leaving other ions that have the same proparties in the solution by adding a precipitating agent . the precipitation will be according to solubility product of ions and the smaller solubility product will be precipitated first >

that would be my answer ,,,,, now i need some one to tell me if it is right and complete :) or do i need to write and know more about fractional precipitation  ?

thanx  ;)
Title: Re: fractional preciptation
Post by: AWK on October 30, 2007, 02:17:25 AM
the smaller solubility product

This is only true for the same type of Ksp eq AgCl, AgBr
but not should be true for eg:
Ca3(PO4)2 and AlPO4