Description: The pink hexaaqua complex of cobalt is converted to the blue chloro complex by addition of concentrated hydrochloric acid. The blue chloro complex is converted back to the pink hexa aqua complex by adding more water.

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Source: Shakhashiri, B.Z. Chemical Demonstrations: A Handbook for Teachers of Chemistry

Year or vol: 1 page: 280

Keywords: Complex Ions, Cobalt (II), Equilibrium, Chloride Ion