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# 3-21 - Announcements Friday Homework WebAssign#11 Due...

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3/21/2008 1 Announcements: Friday, March 21, 2008 Homework WebAssign #11- Due Wednesday, April 2 at 8:00 AM Recitation After Break Print Week 11- Solubility Equilibria AND Pre-Recitation! Lab After Break Lab 8- Separation of Metal Ions Complete your prelab (p. 75) before recitation. Three week lab! Suggested Textbook Questions Read Chapter 19, sections 3 & 4, and working problems (see syllabus). For coming to class on 1) Friday, 2) the morning after an exam and 3) the day before Spring Break, I deserve some clicker points. TRUE or FALSE? March 21, 2008 - CT#1 B. FALSE A. TRUE If a solution contains 1.0 mM SO 4 2- and 1.0 mM S 2- , which would precipitate first upon addition of Pb(NO 3 ) 2 ? PbSO 4 (s) → Pb 2+ (aq) + SO 4 2- (aq) K sp = 1.6 x 10 -8 PbS(s) → Pb 2+ (aq) + S 2- (aq) K sp = 3 x 10 -25 March 21, 2008 - CT#2 A. PbSO 4 C. Cannot tell B. PbS K sp (PbS) < K sp (PbSO 4 ) so it precipitates first! So now we need the max [Pb 2+ ] where PbS forms but PbSO 4 doesn’t. What [Pb 2+ ] is necessary to precipitate PbSO 4 from a 1.0 mM SO 4 2- solution? PbSO 4 (s) → Pb 2+ (aq) + SO 4 2- (aq) K sp = 1.6 x 10 -8 March 21, 2008 - CT#3 A. 1.6 x 10 -11 M B. 1.6 x 10 -8 M D. 1.6 x 10 -3 M E. Cannot tell C. 1.6 x 10

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3-21 - Announcements Friday Homework WebAssign#11 Due...

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