What do you see when sodium hydroxide solution is added to zinc sulphate, till it is in excess?

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Solution

When sodium hydroxide solution is added to zinc sulphate, a white gelatinous precipitate of zinc hydroxide is formed. On further addition of excess sodium hydroxide to the formed precipitate, soluble, colourless complex salt of sodium zincate is formed.

ZnSO₄ + 2 NaOH → Zn(OH)₂ + Na₂SO₄
Zn(OH)₂+ 2 NaOH → Na₂ZnO₂ + 2H₂O

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The products formed when an excess of sodium hydroxide solution is added to zinc sulphate solution are ___ and ___.

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