29 More Solubility Calculations

29 More Solubility Calculations - 1 Common Ion Effect We...

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Unformatted text preview: 1 Common Ion Effect We determined that 0.012 mol of PbBr 2 (K sp = 6.3x10-6 ) would dissolve to make 1L of a saturated solution. How many moles of lead(II) bromide would dissolve if 0.10 mol of NaBr had been added first? A) 6.3 x 10-3 B) 6.3 x 10-4 C) 6.3 x 10-5 D) 6.3 x 10-6 2 We previously determined that 0.012 mol of PbBr 2 would dissolve to make 1L of a saturated solution. How many moles of lead(II) bromide would dissolve if 0.1 mol of NaBr had been added first? 2+- 2 2+- 2 2 sp-6-4 PbBr (s) Pb (aq)+2Br (aq) lots 0.1M-x +x +2x at eq: x M 0.1M + 2x M K = [Pb ][Br ] = (x)(0.1 + 2x) Assume 2x is small compared to 0.1 0.01x= 6.3 10 x = 6.3 10 M x x 3 Exam 3: Two Dates Posted???? Monday, April 19 Tuesday, April 20 Review session Monday, Exam Tuesday!!! More than 24 hours of study time!!! 4 Today’s To Do Account for factors that affect the solubility! Common ions, e.g. What is the concentration of Pb 2+ in a solution of PbBr 2 and NaBr? pH Formation of complex ions, e.g. Cu(NH 3 ) 4 2+ 5 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? 6 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. (See MSJ p. 849) 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- (aq)+ H 2 O(l) H 3 O + (aq) + HCO 3- (aq) H 2 CO 3 (aq)+ H 2 O(l) Relate such solubility effects to LeChatelier’s Principle 7...
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This note was uploaded on 04/23/2010 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 - 1 Common Ion Effect We...

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