9. The following questions are based on following reaction. (8points, 2 each) so
ID: 580445 • Letter: 9
Question
9. The following questions are based on following reaction. (8points, 2 each) soch H2O so2HC (a) Which way would equilibrium be shifted if HCI was removed from the reaction as it is being made? (b) What direction would equilibrium be shifted if water was removed from the reaction? (c) If the reaction above was exdothermic, how in what direction would equilibrium be shifted if the reaction was run at a higher temperature? (d) If a catalyst was added to reaction in what direction would the equilibrium be shifted? 10. If the reaction in question 9 had an equilibrium constant of 0.5, would if favor the formation of the reactants (SOC)2 and H2O) or products (SO2 and HC1)? (5 points)Explanation / Answer
The above equilibrium will obey Le Chatlier's principle which states that if any disturbance is applied to a system in equilibrium, it will counteract the change applied and establish itself in a new equilibrium under that changed condition. It can be observed that the reaction occurs between two liquids and forms two gases - hydrogen chloride and sulphur dioxide.
a) Production of gas develops greater pressure inside the system and as HCl is also a product, if that is removed, more of thionyl chloride will decompose, shifting the equilibrium to the right.
b) If water, one of the reactants is removed from the reaction mixture, the equilibrium will shift to the left as less water will be present for decomposition of thionyl chloride.
c) If a reaction is exothermic, increasing the temperature will result in decomposition of products back to reactants. However, if the reaction is endothermic, the system is absorbing heat from the surroundings to produce the product. So if more heat is supplied, endothermic reactions have their equilibrium shifted to the right.
d) Any catalyst added to an equilibrium speeds up both forward and backward reactions equally. Therefore, though the overall rate will be increased, the equilibrium will not be shifted to any side.
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