Question

What is formula of- complex copper(ii)hexacyanoferrate(ii)

Answer 1

Cu[Fe(CN)6] is the formula

Answer 2

The formula of complex Copper hexacyanoferrate (II) is $Cu_2[Fe(CN)_6]$.

Explanation:

• To derive the formula of the given compound, the individual compound present in the complex must be identified.
• As the given compound is a coordination compound, the cations, anions, etc must be considered.
• Accordingly form the given name Copper hexacyanoferrate (II), the following details are obtained:

• Copper has +2 charge. Thus $Cu_2$
• As the anionic complex is present, so suffix '-ate' must be added with the metal name.
• In the given compound, the metal is iron. Therefore Ferrate (Fe).
• The compound has 6 molecules of $CN^-$. Thus $(CN)_6$
• When the obtained symbols are arranged it gives $Cu_2[Fe(CN)_6]$ as formula.

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