[Sis290025]

[Co(H2O)6]+2 + 4Cl- <-> [CoCl4]-2 + 6 H2O

The hexaaqua complex is pink and the tetrachloride is blue. The reaction is exothermic. As the temperature increases, what will be the color of the solution?
 

Will the color be blue, shifting forward?

Thanks.

[plu]

If the reaction is exothermic, heat can be considered a product of the reaction and thus would appear on the right hand side of the reaction equation.  If temperature is increased, it can be thought that more "heat" is added to the system.  Then, according to Le Chatelier's principles, the reaction would shift to the left, to the pink side.