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Name Exp 11 Equilibrium &Q Work Sheet PCls can be synthesized from PCI and Cl2. The chemical equilibrium reaction for this is below. An equilibrium expression and the Equilibrium Constant are also provided. The Q Expression is provided on the far left PCl3 + Cl2 + PCIE [PCI) (PCI) K [PCI,J(CI, Kc = 25 (PCI,][CL] Six different starting concentrations of the reactants and products were permitted to reach equilibrium. The concentrations are seen below. Trial 1 PCI: + Cl2 PCI Initial at 0.50 M 0.5 M 26 M Change OR Final at Equilibrium 1.0 M 1.0 M 25 M Trial 2 PC13 + Cl2 5 PCI. Initial at 0.15 M 0.15M 0.20 M Change OR Final at Equilibrium 0.10 M 0.10 M 0.25 M Trial 3 PC13 + Cl2 5 PCIE Initial at Q 0.75 M 0.75 M 6.1 M Change OR Final at Equilibrium 0.5 M 0.5 M 6.3 M Trial 4 PC13 + Cl2 PCIE Initial at Q 0.20 M 0.20 M 1.7 M Change OR Final at Equilibrium 0.25M 0.25M 1.6 M Trial 5 PC13 + Cl2 PC155 Initial at Q 0.06 0.06 12 Change OR Final at Equilibrium 0.66M 0.66M 11 M Trial 6 PCI + Cl2 5 PCIE Initial at Q .50 M .50 M 680 M Change OR Final at Equilibrium 5.OM 5.OM 670 M 11 121
The reaction quotient Q is used to predict the direction the reaction will proceed to reach equilibrium. Based upon the comparison of the value of Q to the value of Kc one can predict the direction the reaction will proceed toward equilibrium. a. When the reaction quotient is greater than the equilibrium constant, the reaction proceeds more in the reverse direction to reach equilibrium. b. When the reaction quotient is less than the equilibrium constant, the reaction proceeds more in the forward direction to reach equilibrium. c. When the reaction quotient is equal to the equilibrium constant, the reaction proceeds in neither direction to reach equilibrium. Which is Greater? Calculated Reaction Quotient Q Calculated Equilibrium Constant K Direction to Equilibrium Qor K. + or - Trail 1 Trial 2 Trial 3 Trial 4 Trial 5 Trial 6 122