Chem208_Lecture_20_Rev_Color

Chem208_Lecture_20_Rev_Color - Today: Complexation...

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Unformatted text preview: Today: Complexation Equilibria (18-8, 24-8) Thermodynamics ?? (Chapter 19) Chapters 15–18, 24 PS8 due by 2:00 Tomorrow Exam II: Tuesday, 4/8, 7:30-9:00 Room Assignments are shown on Tuesday’s handout 1 Exam coverage: Review Session Schedule: All in Baker 200 Saturday, 2:00–4:00 Sunday, 12:00 noon–2:00 Chemistry 008 Sunday, 6:00–7:30 (Review questions for the 008 session are posted on Chemistry 008 Blackboard) 2 Complex Ion Formation An example of Lewis Acid/Base Chemistry Complex ions form in a step-wise process Calculate the solubility of AgCl(s) in pure water (Ksp = 1.8 x 10–10) 3 Calculate the solubility of AgCl(s) in 6.0 M NH3(aq) (Kform = 1.8 x 10–10 for Ag(NH3)2+(aq)) Complex ion formation removes free ions from solution in the same way that precipitation does. 4 Review Common Ion Effect - the solubility of a slightly soluble ionic compound is lowered in the presence of a second solute that furnishes a common ion. - the solubility of a slightly soluble ionic compound is increased by the presence of a species that reacts with one of the ions formed during the dissolving process 5 6 Spontaneous Changes A spontaneous change is a change that, once begun, has a tendency to occur without being driven by an external influence. A spontaneous change does not necessarily occur rapidly. 7 Thermodynamics • What determines whether a process will proceed spontaneously? 2 H2(g) + O2(g) ⇔ 2 H20(i) or 2 H2O(l) ⇔ 2 H2(g) + O2(g) H2O(l) ⇔ H20(s) or H2O(s) ⇔ H20(l) 8 ...
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This note was uploaded on 03/29/2009 for the course CHEM 2080 taught by Professor Davis,f during the Spring '07 term at Cornell.

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Chem208_Lecture_20_Rev_Color - Today: Complexation...

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