2Le Chatelier’s PrincipleWhen an equilibrium system is perturbed, the system responds by partially offsetting the perturbation. e.g. N2O4 (g)⇔2 NO2(g) ΔH = 66.4 kJWhich way does equilibrium shift if:1. Temperature is increased? N2O4 (g) + heat ⇔2NO2 (g)2. PTOT increased by reducing V?3. PTOTincreased by adding Argon?4. PNO2(g) decreased by adding O3Shifts to rightShifts to leftNo changeShifts to right
3Iron (III)-Thiocyanate EquilibriumFe3+ (aq) + SCN-(aq) ⇔FeSCN2+(aq)yellowcolorlessredMix 0.01M Fe3+with 0.01M SCN-1. Add Fe3+ 2. Add SCN-3. Add NaOH- Fe(OH)3is insoluble4. Add Hg2+ - Hg(SCN)2is soluble but undissociated in water5. Heat up solution (Reaction is exothermic) Observe red FeSCN2+Becomes darker redBecomes darker redBecomes less redBecomes less redBecomes less red
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