Chem_208_Lecture_12_Color - PS 5 Assigned, Due Next Friday...

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PS 5 Assigned, Due Next Friday Today: Finishing Chapter 15; Starting Ch 16
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Le Chatelier’s Principle When an equilibrium system is perturbed, the system responds by partially offsetting the perturbation. e.g. N 2 O 4 (g) 2 NO 2 (g) Δ H = 66.4 kJ Which way does equilibrium shift if: 1. Temperature is increased? N 2 O 4 (g)+ heat 2NO 2 (g) 2. P TOT increased by reducing V? 3. P TOT increased by adding Argon? 4. P NO2(g) decreased by adding O 3 Shifts to right Shifts to left No change Shifts to right
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Iron (III)-Thiocyanate Equilibrium Fe 3+ (aq) + SCN - (aq) FeSCN 2+ (aq) yellow colorless red Mix 0.01M Fe 3+ with 0.01M SCN - 1. Add Fe 3+ 2. Add SCN - 3. Add NaOH - Fe(OH) 3 is insoluble 4. Add Hg 2+ -Hg(SCN) 2 is soluble but undissociated in water 5. Heat up solution (Reaction is exothermic) Observe red FeSCN 2+ Becomes darker red Becomes darker red Becomes less red Becomes less red Becomes less red
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The Reaction Quotient For the generalized reaction: aA + bB gG +hH [ ] [ ] [] [] b init a init h init g init
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Chem_208_Lecture_12_Color - PS 5 Assigned, Due Next Friday...

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