In aqueous solution cobalt(II) ion is surrounded by 4 water molecules and has a

Question

In aqueous solution cobalt(II) ion is surrounded by 4 water molecules and has a light pink color. When high concentrations of chloride ion are introduced, a cobalt-chloride complex ion forms that has a distinctive blue color.

One way to represent this equilibrium is:

An experiment was run to demonstrate that a dynamic equilibrium exists between these two ions. Starting with a special form of CoCl42-(aq) where one of the chloride ions was isotopically labeled (36Cl used instead of the naturally occuring isotopes), the system was then allowed to reach equilibrium.

Indicate with Y (yes) or N (no) which of the structures below show that the forward or reverse reactions occur for this chemical system.

Explanation / Answer

[CoCl4]2- is a tetrahedral ion.

All four structures A,B, C and D show that forward or reverse reaction occur for this chemical system.

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