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Solubility Product - funnel.sfsu.edu

Solubility ProductThe Solubility of a mineral is governed by the Solubility Product ,the equilibrium constant for a reaction such as:CaSO4(anhydrite) Ca2+ + SO42-The Solubility Product is given by:4242 CaSOSOCaSPaaaK +=If anhydrite is a pure solid, then aCaSO4 = in dilute solutions: aCa2+ (Ca2+) and aSO42- (SO42-).KSP [Ca2+][SO42-] = is the Solubility of anhydrite in pure water?If anhydrite dissolution is the only source of both Ca2+ andSO42-, then: [Ca2+] = [SO42-] = xx2 = = = mol/LMWanhydrite = g/molSolubility = ( mol/L)( g/mol) = g/L4242 CaSOSOCaSPaaaK +=Saturation indexIn a natural solution, it is not likely that [Ca2+] = [SO42-], forexample, because there will be more than one source of eachof these ions. In this case we use saturation indices todetermine if the water is saturated with respect to = [Ca2+]eq[SO42-]eqIAP = [Ca2+]act[SO42-]act[][]SPSP actactKIAPKSOCa== +242 SaturationindexSuppose a groundwater is analyzed to contain 5x10-2 mol/L Ca2+ and7x10-3 mol/L SO42.

Hydrolysis The interaction between water and one or both ions of a salt that results in the formation of the parental acid or base, or both. We classify salts by the strength of the acid and base from


  Product, Acid, Solubility, Solubility product




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