Zinc hydroxide () is a white precipitate obtained in Group IV analysis. It dissolves in an excess of — Qualitative and Quantitative Analysis Chemistry Question
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?
Answer: 4
💡 Solution & Explanation
When $Zn(OH)_2$ dissolves in excess aqueous ammonia, it forms the tetraamminezinc(II) complex ion, $[Zn(NH_3)_4]^{2+}$. In this complex, the central zinc ion ($Zn^{2+}$) is coordinated by 4 ammonia ($NH_3$) ligands. Therefore, the coordination number is 4.
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