Lecture 12 - Devices that predict rain contain cobalt(II...

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2/3/10 1 23 Devices that predict rain contain cobalt (II) chloride under both hydrated (with 6 water molecules) and anhydrous form according to the following equilibrium: CoCl 2 (s) + 6 H 2 O(g) ! CoCl 2 • 6H 2 O (s) purple What colour is the indicator if rain is imminent? A) Green B) Pink C) Purple Pressure H 2 O increases, equilibrium shifts right dry conditions = purple pink Colour of compound Rain = large concentration of water vapour in the air Therefore, imminent rain = pink 24 Back to Monday’s Handout 3.B. The Effect of Changes in Pressure. - No effect as inert gas not in K expression 25 iii. Change pressure by changing volume (see below) ii. Add inert gas (not involved in the reaction), e.g., Ne(g) - P total increases for constant V i. Change pressure by adding or removing reactants or products (see above) - but partial pressures are the same (Ratio does not change) 3.C. The Effect of Changes in Volume. If the volume changes, concentrations or pressures of reactants and products change. This may affect Q. Consider the reaction: 2 SO 2 (g) + O 2 (g) ! 2 SO 3 (g) 26 equilibrium shifts to decrease total number of gas molecules If the Container volume is increased, which way will the equilibrium shift?
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This note was uploaded on 04/22/2010 for the course CHEM 102 taught by Professor Brown during the Winter '10 term at University of Alabama at Birmingham.

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Lecture 12 - Devices that predict rain contain cobalt(II...

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