Question

Studying the (CoCl4)^2 / (Co(H2O)6)^2+ Equilibrium.
-color of original equilibrium
dark-blue
-color change after addition of distilled water
lighter shade of dark blue
- color change after addition of 12M HCl
sky-blue
- color change after addition of distilled waster
lavender
-color change after heating mixture
light blue
- color change after cooling mixture
darker shade of purple.





(CoCl4)^2- (aq, blue) + 6H2O (l)= (Co(H2O)6)^2+ (aq, pink)+ 4Cl^-(aq)

6) Use Le Chateliers principle to account for the color change youobserved when you added 12M HCl to the equilibrium mixture
7)Based on your answer to question 6 , would you expect to observethe same color change if you added a saturated NaCl solutioninstead of adding the 12M HCl? Explain.
8) After the equilibrium mixture was cooled in the ice-water bathwhat was the predominant cobalt(II) species present in thesolution, (CoC14)^2 or (Co(H20)6)^2+. explain.
9) Based on your answer to question 8, is the forward reactionexothermic or endothermic? Rewrite the equilibrium reaction toinclude the heat term.