A student adds the following stresses one at a time to separate samples of an equilibrium mixture of [Co(H2O)6]^2+ (pink) <-> [CoCl4]^2- (blue) + 6 H2O (delta H > 0 forward) and records color change: Trial A: heat the solution -> turns blue Trial B: add concentrated HCl -> turns blue Trial C: add AgNO3 -> turns pink Trial D: add water -> turns pink
Which observation is best explained by Le Chatelier's principle removing Cl-?
- A
Trial A
- B
Trial B
- Ccheck_circle
Trial C
- D
Trial D
Explanation
AgNO3 precipitates AgCl, removing Cl-. The equilibrium shifts back toward [Co(H2O)6]^2+ (pink).