Lec-28-Chap17-2-bare

Lec-28-Chap17-2-bare - Lec-28-Chap17-2-Complete 11/7/2011...

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Lec-28-Chap17-2-Complete 11/7/2011 Solubility of Ionic Compounds. Solubility Product. Common Ion Effect 1 Lec-28: Solubility of Ionic Compounds Chapter 17 (Sec. 17-5) 1 Solubility Equilibria Many ionic compounds are only slightly soluble in water.       A AB B s aq n x m y x y The equilibrium constant equation for the solubility equilibrium is sp A B x n y m K   As an example we have       4 4 2 2 Ba aq BaSO s SO aq 2 4 10 sp 2 1.1 10 SO K 2
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Lec-28-Chap17-2-Complete 11/7/2011 Solubility of Ionic Compounds. Solubility Product. Common Ion Effect 2 Solubility Equilibria With the information provided by the solubility product we can find the solubility of the sparingly soluble salt. If no other species is in the solution s expresses the solubility of the salt in mol L –1 .           2 4 4 2 ini BaSO s soli Ba aq 0 t. eq. SO aq 0 d soli d' s s 2 sp 10 5 s 2 4 2 4 2 2 p 5 mol 1.1 10 1.05 10 L mol 1. Ba SO SO 05 10 L s K sK s s s     3 Solubility Equilibria In the more general case           init A B s soli Aa d q 0 B aq 0 . eq. solid' xy n m x xs y ys     sp 1 sp sp B A x x n x x y y m y y y x xx y y Ks K xs x y s y K sy y    4 Here s is the solubility of the salt expressed as the number of moles of the salt that dissolve in a liter of solution.
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Lec-28-Chap17-2-Complete 11/7/2011 Solubility of Ionic Compounds. Solubility Product. Common Ion Effect 3 We can then calculate the solubility   3 sp 1 1 5 2 2 3 3 sp sp 2 3 2 4 1.7 10 mol 1.62 10 44 C 4L l P 2 b Ks KK s s s                 2 2 2Cl aq init PbCl s s Pb aq 0 . eq. 0 olid soli 2 d s s 2 5 sp 2 1.7 10 Pb Cl K  5 Example       2 2 Pb PbCl lq s aq 2C a Solubility Equilibria We can also express the solubility in other units. For
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Lec-28-Chap17-2-bare - Lec-28-Chap17-2-Complete 11/7/2011...

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