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Question
What happens when sodium hydroxide is added in excess to zinc sulphate solution?
Short Answer
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Solution
When sodium hydroxide is added to zinc sulphate solution:
1. Initially, a white precipitate of zinc hydroxide is formed.
\[\ce{ZnSO4 + 2NaOH -> Zn(OH)2↓ + Na2SO4}\]
2. In excess NaOH, the white precipitate dissolves to form a soluble sodium zincate solution.
\[\ce{Zn(OH)2 + 2NaOH -> Na2[Zn(OH)4]}\]
Thus, zinc hydroxide is amphoteric and dissolves in excess sodium hydroxide.
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