The questions below refer to the following system:
Co(H 2 O) 6 2+ + 4 Cl - CoCl 4 2 - + 6H 2 O
(pink)
(blue)
When cobalt(II)chloride is added to pure water,the Co 2+ ions hydrate.The hydrated form then reacts with the Cl - ions to set up the equilibrium shown here.
-Which statement below describes the change that the system will undergo if silver nitrate is added?

Question

The questions below refer to the following system:
Co(H 2 O) 6 2+ + 4 Cl -  CoCl 4 2 - + 6H 2 O
(pink)
(blue)
When cobalt(II)chloride is added to pure water,the Co 2+ ions hydrate.The hydrated form then reacts with the Cl - ions to set up the equilibrium shown here.
-Which statement below describes the change that the system will undergo if silver nitrate is added?

Quizplus · Accepted Answer

Adding silver nitrate will form Ag^- ions in the solution. These ions will react with the H₂O ions to form Ag₂O(s) and H+²⁺. As a result, the concentration of the Co²⁺ ions will decrease and the CoCl₄²^- ions will dissociate further to maintain equilibrium. Since the CoCl₄²^- ions are pink in color, the solution should become more pink. Therefore, choice B is the correct answer.

The Questions Below Refer to the Following System