The aqueous solution of a transition metal sa | vedclass

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(B) The transition metal salt,typically cobalt$(II)$ chloride,exists as $[Co(H_2O)_6]^{2+}$ (pink) in aqueous solution.When concentrated $HCl$ is adde

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change in the coordination number of the metal ion from $6$ to $4$ and formation of new species in solution

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(B) The transition metal salt,typically cobalt$(II)$ chloride,exists as $[Co(H_2O)_6]^{2+}$ (pink) in aqueous solution.When concentrated $HCl$ is added,chloride ions $(Cl^-)$ act as ligands and replace water molecules to form the complex $[CoCl_4]^{2-}$ (blue).This reaction involves a change in the coordination number of the metal ion from $6$ to $4$ and the formation of a new chloro-complex species in the solution.

The aqueous solution of a transition metal salt changes colour from pink to blue when concentrated hydrochloric acid is added to it. The change in colour is due to:

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