D OT BM ALl to the tube until the color indicator changes to light pink. Mix aga

Question

D OT BM ALl to the tube until the color indicator changes to light pink. Mix again and record your observations and answer these questions in your lab notebook, Q1. In which direction did this stress cause the equilibrium system to shift? Q2.What caused the shift? Explain. Dispose of the contents of the test tube in the waste jar provided and rinse. PART II. Ca(OH), + CAC, Add about spatula of Ca(OH), to the small test tube Add DI water to about 1/2 full and mix to dissolve the Ca(OH),(Note: some may not dissolve) Add a few drops of 1M CaCI, solution to the test tube. Record your observations and answer these questions in your lab notebook Q1. In which direction did this stress cause the equilibrium system to shift? Q2. Which ion caused the shift? Explain. Dispose of the contents of the test tube in the waste jar provided and rinse. Sul PART 1. Ca(OH),-HEAT Using a small beaker, collect some ice and add water to create an ice bath. Add about 1 spatula of Ca(OH), to the small test tube. Add DI water to about 1/2 full and mix to dissolve the Ca(OH), Make careful observation of the amount of solid Ca(OH), in the test tube. Answer these questions in your lab notebook Q1. In which direction did this stress cause the equilibrium system to shift? Q2. Which ion caused the shift? Explain. Use a wax pencil to make a line on the tube to indicate the amount of precipitate present. Place the test tube in the ice bath for a few minutes. Remove the test tube and mix thoroughly. Note any changes in the amount of precipitate. Record your observations and answer these questions in your lab notebook; Q1. In which direction did this stress cause the equilibrium system to shift? Q2. Which ion caused the shift? Explain. Dispose of the contents of the test tube in the waste jar provided and rinse. 81 LeCHATELIER'S PRINCIPLE

Explanation / Answer

Ca(OH)2 (solid) --> Ca2+(aq) + 2OH-(aq)

Part II

1) Stress caused the system to shift in the reverse direction.

2) Increase in the concentration of Ca2+ in the product caused the reaction to shift backward to nullify the stress.

Part III

1) Stress caused the system to shift in the forward direction.

2) According to Le Chatelier's principle, for an exothermic reaction, decrease in the temperature of the reaction will cause the reaction to proceed forward.

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