Here might be a nuge. I don't think I've done a problem like this but I can sort of see how it works.
Ca 2+ (aq) + SO4 2- (aq) --> CaSO4(s)
Right?
Ksp = [Ca2+][SO4 2-]
[ ] is concentration (i.e. molarity)
I think this might help. Look up Ksp in The Dictionary for more help. It says that this should work the same way that any other equilibrium problem works.
guanine
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