Zinc hydroxide () is a white precipitate obtained in Group IV analysis. It dissolves in an excess of ammonia solution () to form a soluble complex ion. What is the coordination number of the zinc atom

Question

Zinc hydroxide ($Zn(OH)_2$) is a white precipitate obtained in Group IV analysis. It dissolves in an excess of ammonia solution ($NH_4OH$) to form a soluble complex ion. What is the coordination number of the zinc atom in this newly formed soluble ammine complex?

Prashant Kotian · Accepted Answer

Correct answer: 4. When dissolves in excess aqueous ammonia, it forms the tetraamminezinc(II) complex ion, . In this complex, the central zinc ion () is coordinated by 4 ammonia () ligands. Therefore, the coordination number is 4.

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