Equilibrium
When a salt dissolves an equilibrium is set up.
example: PbI2(s) --> Pb2+(aq) + 2I-(aq)
The equilibrium constant Kc is a ration of [products]/[reactants] at equilibrium
When you write a Kc expression, you never include solids or water when it is present as a solvent.
Qs is the reaction quotent for the dissolving process when a solution is formed that is NOT a saturated solution.
Ks is the solubility product and is for the dissolving process when a solution is formed that IS saturated.
Ks(BaSO4) = [Ba2+] [SO42-]
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