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What would you expect to observe if you added a saturated NaCl solution to a pink...

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.

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Answer #1

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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