Demo Lab: Equilibrium Shifts

Demonstration Labs: Equilibrium Shifts

Here is the reaction:

CoCl₄^2- (aq) +6 H₂O (l) « Co(H₂O)₆²⁺ (aq) + 4Cl^- (aq)

          blue                     violet                             pink

At the moment the reaction is at equilibrium.

1. Write the equation and label the reactants and the products.

2. Make predictions about what color you think will appear when Ms. Cotta adds a stress to the system.

	Add HCl	Add Ag(NO3)	Add CaCl2	Add acetone	Add H2O	Heat	Ice bath
Predict:
Actual:

3. When we added CaCl₂, what happened to the color? Which way was the reaction moving forward (to the products) or reverse (to the reactants)? Explain why.

4. Then explain the same each for HCl, Ag(NO₃), acetone, H₂O. 

5. When we added heat, what happened to the color? Which way was the reaction moving forward or reverse? Explain why.

6. So does this mean the reaction is exothermic or endothermic? Examine the direction it shifted when heat was added.