Equilibrium activity 2

Cobalt(II) ions(blue) react with chloride ions according to the reaction below to form a pink coloured ion complex. Click to see a 120kb video of the reaction.
Click to see a 120kb movie. Notice how the solution starts to turn darker as heat is applied.
The ion complex is blue in color Cobalt ion is pink in colour.
The equilibrium expression for the reaction above is shown below.
The equilibrium expression for the reaction.

The pink solution containing cobalt chloride ions is heated and after a short time turns blue as shown on the right. Explain according to the observations if the reaction is exothermic or endothermic.

The ion complex is blue in color Cobalt ion is pink in colour.
Describe how the equilibrium position shifts as a result of heating.

Look at the equilibrium expression above and predict which way the reaction will shift if the volume of the reaction vessel is increased. Look at the 120kb video and see if your prediction is correct. The video shows distilled water added to a blue solution of the above reaction at equilibrium. What does the blue colour indicate?

After looking at the video suggest why the top of the test tube turns pink while the bottom half of the test tube remains dark blue.

How does the equilibrium shift as a response to an increase in volume?

What colour change would you predict of NaCl was added to the solution?

 
Solutions