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Colour & Electronic ConfigCoordination Compounds

Why does an aqueous pink solution of Co(II)Co(II)turn deep blue upon addition of excessHClHCl ?

Expert Answer

Due to the change from octahedral [Co(H2O)6]2+[Co(H_2O)_6]^{2+} (Pink) to tetrahedral [CoCl4]2[CoCl_4]^{2-} (Blue).

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