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CH3041
SOLUBILITY PRODUCT
• Solubility Product  Ksp     
             salt(s) D ccation(aq) + danion(aq) 
     eg.  CaCO3(s) D Ca2+(aq) + CO32-(aq)
Saturated soln. of the salt and the ions.
No more salt can go into solution.
    Ksp = [cation]c[anion]d  equilibrium concs.
• Ion Product  Q                          (freshwater)
This is the product of the initial ion concs.
    Q = [cation]oc[anion]od                initial concs.
• If Q > Ksp the salt precipitates.
• If Q < Ksp no ppt occurs.
• Ion Activity Product IAP         (seawater)
    IAP = aCationc x aAniond