Zinc hydroxide () is an amphoteric white precipitate. It readily dissolves in an excess of aqueous s — Qualitative and Quantitative Analysis Chemistry Question
Question
Zinc hydroxide ($Zn(OH)_2$) is an amphoteric white precipitate. It readily dissolves in an excess of aqueous sodium hydroxide ($NaOH$). The coordination number of the central zinc atom in the newly formed soluble complex ion is:
Answer: B
💡 Solution & Explanation
Zinc hydroxide reacts with excess $OH^-$ to form the highly soluble tetrahydroxozincate(II) complex ion, $[Zn(OH)_4]^{2-}$. In this complex, the coordination number of zinc is exactly 4.
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