# Experiment 9 - Effect of temperature and pressure on equilibrium
-To determine the effect of the temperature and pressure of an equilirium environment on the direction of the equilibrium reaction. Temperature is tested by adding methyl violet indicator to a solution of phosphoric acid which shows the concentration of ionised H+ and H2PO4- ions. Pressure (inversely proportional to volume) is tested with dinitrogen tetroxide and the colour change is observed.
+To determine the effect of the temperature and pressure of an equilirium environment on the direction of the equilibrium reaction. Temperature is tested by adding methyl violet indicator to a solution of phosphoric acid which shows the concentration of ionised H+ and H2PO4- ions. Pressure (inversely proportional to volume) is tested with dinitrogen tetroxide and the colour change is observed.
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+N2O4(g) <-> 2NO2(g)
+ clear <-> brown
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+Explain colour changes - net forward/back reaction
+2 page question
+Do not duplicate
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+What was the change to equilibrium system? (do not copy method)
+(1 mark for each test)
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+Vertical lines on plots
+(selection of graphs)
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+Reaction conc initially > product conc
+Two marks on x-axis - init. & funal equilibrium
+Rule graphs
+Lines may cross
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+H33PO4 - each product concentration is equal (dissociation of acid) - one line
+Fe3+ + SCN- - each reactant is not necessarily equal concentration
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+90 marks total
+17 marks from results
+1 mark/box on first question (table)