What would you expect to observe if you added a saturated NaCl solution to a pink [CoCl4]2-/[Co(H2O)6]2+ equilibrium mixture? Compare this predicted effect to the actual effect (color changes to blue) and account for your answer using Le Chatelier's Principle.
the equation for this reaction is the next one:
[Co(H2O)6]2+(aq)(pink) + 4Cl-(aq) ⇌ [CoCl4]2-(aq)(blue) + 6H2O(l)
So an increase of concentration of [CoCl4]2-(aq) will turn the solution bluer, and an increase of the concentration of [Co(H2O)6]2+(aq) will turn it pinker.
If you add NaCl, you have an excess of Cl- ions. Those ions start to replace water in the
[Co(H2O)6]2+ . the system in order to consume those chloride produce more [CoCl4]2-(aq) and turns the solution bluer.
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