An aqueous pink solution of Cobalt (II) chlor | vedclass

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Question

(B) The aqueous pink solution of cobalt $(II)$ chloride contains the octahedral complex $[Co(H_2O)_6]^{2+}$.When excess of $HCl$ is added,the followin

Vedclass · Accepted Answer

$[Co(H_2O)_6]^{2+}$ is transformed into $[CoCl_4]^{2-}$

Vedclass · Answer

(B) The aqueous pink solution of cobalt $(II)$ chloride contains the octahedral complex $[Co(H_2O)_6]^{2+}$.When excess of $HCl$ is added,the following reaction occurs:$[Co(H_2O)_6]^{2+} (aq) + 4Cl^- (aq) \rightarrow [CoCl_4]^{2-} (aq) + 6H_2O (l)$.The formation of the tetrahedral complex $[CoCl_4]^{2-}$ results in a deep blue color.Tetrahedral complexes have smaller crystal field splitting than octahedral complexes,where $\Delta_{t} = \frac{4}{9} \Delta_{0}$.Therefore,option $(B)$ is correct.

An aqueous pink solution of Cobalt $(II)$ chloride changes to deep blue on addition of excess of $HCl$. This is because:

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