29 More Solubility Calculations

29 More Solubility Calculations - Silver sulfate, Ag2SO4...

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1 1 Silver sulfate, Ag 2 SO 4 (K sp = 1.7 x 10 -5 ) What is the solubility of silver sulfate in mol/L? A) 4.1 x 10 -3 M B) 2.6 x 10 -2 M C) 1.6 x 10 -2 M D) 2.0 x 10 -2 M +2 - 24 4 2 - sp 4 -5 2 -5 3 -2 Ag SO (s) 2Ag (aq)+SO (aq) at equilibrium 2y M y M K =[Ag ] [SO ] 1.7x10 =(2y) (y) 1.7 x 10 = 4y y=1.6x10 M   2 Account for factors that affect the solubility! pH Common ions, e.g. What is the concentration of Pb 2+ in a solution of PbBr 2 and NaBr? Formation of complex ions, e.g. Cu(NH 3 ) 4 2+

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2 3 Limestone Limestone = Calcium carbonate, CaCO 3 K sp = 8.7 x 10 -9 Pretty insoluble! But look what happens to limestone statues and deposits – Why does this happen? 4 Effect of pH on Solubility Applies to any salt for which the anion is the conjugate base of a weak acid, e.g. calcium carbonate, CaCO 3 CaCO 3 (s) Ca 2+ (aq) + CO 3 2- (aq) K sp = 8.7x10 -9 H 3 O + (aq) + CO 3 2- (aq) HCO 3 - + H 2 O 1/K 2 = 1/(4.8x10 -11 ) H 3 O + (aq) + HCO 3 - (aq) H 2 CO 3 (aq)+ H 2 O 1/K 1 = 1/(4.2x10 -7 ) Add these together and see what you get! 2H 3 O + (aq) + CaCO 3 (s) Ca 2+ (aq) + H 2 CO 3 (aq)+ 2H 2 O K sp2 = K sp /(K 1 K 2 ) = 4.3x10 5
3 5 But the story hasn’t ended!

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This note was uploaded on 02/13/2011 for the course CHE 132 taught by Professor Hanson during the Spring '08 term at SUNY Stony Brook.

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29 More Solubility Calculations - Silver sulfate, Ag2SO4...

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