by 4 water molecules and has a light pink color, when high concentrations of In

Question

by 4 water molecules and has a light pink color, when high concentrations of In aqueous solution cobalt() ion is surrounded chloride ion are introduced, a cobalt-chloride complex ion forms that has a distinctive blue color. One way to represent this equilibrium is: CoCIA (aq) Co. (aq) 4 Cl (aq) An experiment was run to demonstrate that a dynamic equilibrium exists between these two ions. Starting with a special form of Cocl (aq) where one of the chloride ions was isotopically labelede cl used instead of the naturally occuring isotopes), the system was then allowed to reach equilibrium. CI 36 CI Co CI CI

Explanation / Answer

ACBD is the alphabetical order of the structures. But structure D is less probable to achieve.

A is initial structure. Later A exchanges its isotopic chlorine with normal chlorine to give structure B.

Then B exchanges its one of the chlorine with isotopic chlorine to give C.

Then C exchanges another normal chlorine with isotopic chlorine to give D.

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