Coordination compounds refer to a particular class of compounds in which the central atom or ion, usually a metal, is surrounded by cluster of ions or molecules. These compounds are widely present in minerals, plants, etc. These compounds have many practical applications like estimation of hardness in water, soil and plant treatment, electroplating, textile dyeing, etc. These are the addition compounds which retain their identity in the solid as well as in the dissolved state. In such compounds the individual properties of the constituents are usually lost. For example, on mixing aqueous solution of copper sulphate with aqueous solution of ammonia, a deep blue coloured solution is formed. The blue coloured solution does not show the presence of Cu²⁺ but instead it contains cupro – ammonium ions; [Cu (NH₃)₄]²⁺ which are formed by the combination of Cu²⁺ ion and four ammonia molecules. Such ions are known as complex ions.

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