PracticeChap14-2key - Recommended Problems for Chapters 14,...

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Recommended Problems for Chapters 14, round 2 Problems from Oxtoby: Ch. 14: 13-16, 59, 60, 71-75, 77, 93 Oxtoby is much more calculation-focused than we are; these are intended to help you understand the various aspects of the material and not generally representative of exam questions. Questions similar to some of the more conceptual questions could be exam-like. Additional Problems: Which salt is the most soluble in water? A. Al(PO 4 ) K sp = 10 -20 Solubility = 10 -20/2 = 10 -10 B. Ba 3 (PO 4 ) 2 K sp = 10 -30 Solubility ~ 10 -30/5 = 10 -6 (ignoring the 104 1/5 = 2.5 factor) C. Ca 3 (PO 4 ) 2 K sp = 10 -25 Solubility ~ 10 -25/5 = 10 -5 (ignoring the 104 1/5 = 2.5 factor) D. Cr(PO 4 ) K sp = 10 -24 Solubility ~ 10 -24/2 = 10 -12 The solubility (x) of salt AnBm is (nx) n (mx) m = n n m m x n+m = K sp , or x ~ K sp 1/(n+m) Calculate how much Cr(PO 4 ) (K sp = 10 -23 ) will dissolve in a 1 L solution that already contains 1 mol of Na 3 (PO 4 ) (K sp ~ 16).
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This note was uploaded on 11/19/2008 for the course CHEM 230 taught by Professor Sharp during the Fall '08 term at University of Michigan.

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PracticeChap14-2key - Recommended Problems for Chapters 14,...

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