Question

The formation of CoCl42- from Co2+ and Cl- is endothermic. Are the color changes that accompany heating and cooling of the equilibrium mixture in agreement with Le Chatelier's principle? Explain

Answer 1

The formation of CoCl₄^2- from Co²⁺ and Cl^- is endothermic. Yes, the color changes that accompany heating and cooling of the equilibrium mixture is in agreement with Le Chatelier's principle.

[Co(HO)₆]+ +4Cl^- + heat → [Co(Cl)₄]^2- + 6H₂O

Pink color                             Blue color

According to Le Chatelier’s principle, on heating the reaction or adding more Cl^-, will drive the reaction to the right side. On cooing the reaction or removing Cl^- will drive the reaction to the left side.