# Using Chatelier’s principle predict the direction of the net reaction

Iron Thiocyanate Equilibrium 1. Write the equilibrium constant expression for the following reaction. Co2 (aq) 4Cl-(aq) Û CoCl42-(aq) In which direction will the equilibrium shift if [Co2 ] is increased? In which direction will the equilibrium shift if [CoCl42-] is decreased? 2. Using Chatelier’s principle predict the direction of the net reaction in each of the following systems equilibrium systems as a result of increasing the pressure at constant temperature (ie. decreasing the volume available to any gases.) a. N2(g) O2(g) Û 2NO(g) b. PCl5(g) Û PCl3(g) Cl2(g) c. Sn(s) 2H (aq) Û Sn2 (aq) H2(g) d. CaO(s) CO2(g) Û CaCO3(s) 3. Write equilibrium constant expressions for each of the systems given in question 2. a. b. c. d. 4. Explain the shifts you predicted in question 2 in terms on the equilibrium constant expressions. a. b. c. d. 5. What effect (shift from the right or to the left) does an increased in temperature have on each of the following systems at equilibrium? Explain. a. 3O2(g) Û 2O3(g) DH= 284 kJ b. 2SO2(g) O2(g) DH= -198 kJ 6. Complete the table below for the reaction Ni(s) 4 CO(g) Û Ni(CO)4(g) DH < 0 Answering “¬” “­” “®” “¯” or “no change” after the perturbation is made. What is the effect on the parameters on the right after the perturbation below is made PCO PNi(CO)4 equilibrium KP e.g. argon is added No change No change No change No change More Ni is added More CO is added More Ni(CO)4 is added T is increased Note: ¬ shifts to the left ­ increases ® shifts to the right ¯ decreases.

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