103B PS 6 - problem set 1 Page 1 CHEMISTRY 103B, Spring...

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Page 1 problem set 1 4/10/2008 12:17:09 AM http://www.chem.arizona.edu/~kellerp/ps-answers/PS6an/PS6an.htm CHEMISTRY 103B, Spring 2008 Problem Set 6: 15 Points Answer Key Problem1. (eightpoints) Thisisa solubilityequilibriumproblemdealingwitha saturated water solutionof calciumphosphateinequilibriumwithsolidcalciumphosphate. TheK sp valueforthissubstanceis1.2 x 10 -29 . Ca 3 (PO 4 ) 2 (s) + H 2 O(l) 3Ca 2+ (aq) + 2PO 4 3- (aq) Initial 00 Change +3x +2x Equilibrium [3x] [2x] (a) Findthe concentrationinmol/L of calciumioninthe solution . Let x be the numberof molesof calciumphosphatethatdissolvein1.00 L of water. The concentrationof calciumionwillthenbe 3x and thatof phosphateionwillbe 2x (why?) [Ca ] = 3x = 1.9 x 10 -6 mol/L (b) Findthe concentrationinmol/L of phosphateioninthe solution . [PO 4 ] = 2x = 1.3 x 10 -6 (c) Findthe total concentration of all ions(sumof positiveand negativeconcentrations )in thissolution . TotalConcentration= (1.9 x 10 -6 ) + (1.3 x 10 -6 ) = 3.2 x 10 -6 (d) Ifthe calciumionconcentrationisincreasedby addinga solublecalciumsalt, the concentrationof phosphateionwillincrease, decrease, or staythe same(choose one).
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This note was uploaded on 04/10/2008 for the course CHEM 103B taught by Professor Keller during the Spring '08 term at University of Arizona- Tucson.

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103B PS 6 - problem set 1 Page 1 CHEMISTRY 103B, Spring...

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