Ksp[1] - CHEMICAL EQUILIBRIUM STANTS SOLUBILITY PRODUCT...

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CHEMICAL EQUILIBRIUM SOLUBILITY PRODUCT CON- STANTS We have discussed the chemical equilibrium of compounds that are soluble in water. In this sec- tion, we will examine the equilibrium of insoluble ionic compounds. Examples; AgCl, BaSO 4 , Ca 3 (PO 4 ) 2 . SOLUBILITY PRODUCT CONSTANTS (Ksp) · In water, ionic solids dissociate into their ions. · Ionic compounds that are classified as soluble dissociate completely · Ionic compounds that are classified as insoluble dissociate slightly. For such compounds, equilibrium is reached when no more solid can be dissolved. The solution is said to be satur- ated. This equilibrium is described in the following chemical equation: MX(s) M + (aq) + X - (aq) · For the reversible reaction illustrated above, one can express the concentrations at equilibri- um in term of the equilibrium constant. This constant is called the “solubility product con- stant, Ksp”: Ksp = [M + ][X - ] MX is a solid and therefore, it is not included in the Ksp expression. Ksp is temperature dependent just like any other equilibrium constant.
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This note was uploaded on 05/19/2011 for the course HIS 39930 taught by Professor Ming during the Spring '09 term at University of Texas at Austin.

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Ksp[1] - CHEMICAL EQUILIBRIUM STANTS SOLUBILITY PRODUCT...

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