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Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: sickness on April 19, 2005, 03:04:58 PM

Title: ratios using Ksp and precipitation
Post by: sickness on April 19, 2005, 03:04:58 PM

If I am given Ksp for 2 things how do I determine from that the ratios.  Also does Ksp have any bearing on percipitation and if so how would I figure it into an equation for precipitation?

Here is what I got with the precip question

.1 g CuS/72.144g CuS = .0013 mols CuS
this all dissolves
I have .002 mols CdS at Ksp of 10^-27
What I want to do is just take .0013*144.476g/mol =.2002g CdS but I am pretty sure it is not that easy.  Can anyone tell me where I am going wrong?

Title: Re:ratios using Ksp and precipitation
Post by: Donaldson Tan on April 22, 2005, 03:47:39 AM

if the ionic product of the salt exceed its Ksp value, then precipitation occurs such that the ionic product will be reduced to its Ksp value.