Homework Help: chem

Posted by tomi on Thursday, April 23, 2009 at 5:39pm.

A 75.0mL sample of 1.56×10−2M Na2SO4(aq) is added to 75.0mL of 1.22×10−2M of Ca(NO3)2(aq).

What percentage of the Ca+ remains unprecipitated?

chem - DrBob222, Thursday, April 23, 2009 at 6:03pm
CaSO4(s) ==> Ca^+2 + SO4^=
Ksp = (Ca^+2)(SO4^=)

I would calculate moles Ca^+2 and moles SO4^=, from an ICE chart you will know which is the limiting reagent and from there which is the common ion (that will be the one in excess). Then calculate the solubility and from there how much remains. Find percent of that.
chem - krishna, Monday, April 27, 2009 at 5:54pm
the answer is not clear

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