A pink coloured aqueous solution of Co(NO_3)_ | vedclass

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(A) The pink colour of the aqueous solution is due to the presence of the octahedral complex $[Co(H_2O)_6]^{2+}$. Upon the addition of $HCl$,the chlor

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$[CoCl_4]^{2-}$

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(A) The pink colour of the aqueous solution is due to the presence of the octahedral complex $[Co(H_2O)_6]^{2+}$. Upon the addition of $HCl$,the chloride ions $(Cl^-)$ act as ligands and displace the water molecules to form the tetrahedral complex $[CoCl_4]^{2-}$,which is blue in colour. The reaction is: $[Co(H_2O)_6]^{2+} (	ext{pink}) + 4Cl^- ightarrow [CoCl_4]^{2-} (	ext{blue}) + 6H_2O$.

$A$ pink coloured aqueous solution of $Co(NO_3)_2$ turns blue on the addition of $HCl$ gradually. This colour change happens due to the formation of

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