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common-ion-effect

# common-ion-effect - The common ion effect predicting...

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The common ion effect, predicting precipitation : Read pg. 580 – 582 (common ion effect section only). Do PE 20 – 21 By the end of the period: PE 14 – 19, PE 20 – 25

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Common ion lab PbCl 2 (s) Pb 2 + (aq) + 2Cl (aq) A + B Explanation 1 2 3 4 Cl in water causes shift left Cloudy / precipitate Pb causes shift left Cloudy / precipitate No Cl or Pb No reaction (oily) Cl causes shift left Cloudy / precipitate Common ion : “The ion in a mixture of ionic substances that is common to the formulas of at least two.” Common ion effect : “The solubility of one salt is reduced by the presence of another having a common ion”
PbI 2 (s) Pb 2+ (aq) I (aq) 1 2 0 0.10 x 2x 0.10 + 2x x R I C E Ksp = [x] [0.10 + 2x] 2 = 7.9 x 10 9 Ksp = [Pb 2+ (aq)] [I (aq)] 2 Example 14.17 (pg. 581) Molar solubility of PbI 2 ? Ksp = 7.9 x 10 –9 Concentration of NaI is 0.10, thus [I ] = 0.10 NaI(s) Na + (aq) + I (aq) x is small, thus we can ignore 2x in 0.10 + 2x Ksp = [x] [0.10] 2 = 7.9 x 10 9 , x = 7.9 x 10 –7 M

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AgI(s) Ag + (aq) I (aq) 1 1 0 0.20 x x 0.20 + x x R I C E Ksp = [x] [0.20 + x] = 8.3 x 10 17 Ksp = [Ag + (aq)] [I (aq)] PE 20 (pg. 582) Molar solubility of AgI?
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