CHP17_4-17_7 Handouts6

CHP17_4-17_7 Handouts6 - Solubility Equilibria The...

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1 The Solubility-Product Constant, K sp • Consider a sparingly soluble ionic solid: MgF 2 (s) ! Mg 2+ (aq) + 2F - (aq) for which the equilibrium constant expression is K sp = [Mg 2+ ][F - ] 2 K sp is the solubility product . The solubility product is the molar concentration of ions raised to their stoichiometric powers. • MgF 2 is ignored because it is a pure solid so its concentration is constant. Solubility Equilibria Solubility Equilibria The Solubility-Product Constant, K sp • Molar solubility is the number of moles of solute dissolving to form a liter of saturated solution. This is the quantity used in the Ksp expression. K sp is not the same as solubility but they are easily related. Solubility Equilibria Solubility Equilibria Solubility Solubility • Solubility is the amount (grams) of the solid COMPOUND that dissolves to form a saturated solution. • Solubility is generally expressed as the mass of this compound dissolved in 1 L (g/L) or 100 mL (g/mL) of soln • To calculate K sp , the solubility number needs to be converted into a molar solubility number for the compound; • Molar solubility is converted into the molar concentration of ions at equilibrium (equilibrium calculation) using the coefficients of the balanced equilibrium equation!
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This note was uploaded on 04/19/2008 for the course CHEM 123 taught by Professor Larosa during the Spring '06 term at Ohio State.

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CHP17_4-17_7 Handouts6 - Solubility Equilibria The...

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