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Question
Write the observation, and balanced equation for the following reaction:
Sodium hydroxide is added dropwise to a solution of zinc sulphate, till it is in excess.
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Solution
Sodium hydroxide when added to zinc sulphate gives gelatinous white precipitate which dissolves in excess of sodium hydroxide.
\[\ce{ZnSO4 + 2NaOH -> Zn(OH)2 + Na2SO4}\]
\[\ce{Zn(OH)2 + 2NaOH -> Na2ZnO2}\]
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