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Question
Write the observation for the following:
NaOH is added drop-wise till in excess to a solution of zinc sulphate.
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Solution
When NaOH is added drop-wise to a solution of zinc sulphate, then the following reaction takes place:
\[\ce{ZnSO4 + 2NaOH -> \underset{\text{White gelatinous ppt.}}{Zn(OH)2 v + Na2SO4}}\]
When NaOH becomes in excess, then the following reaction takes place:
\[\ce{Zn(OH)2 + 2NaOH -> \underset{\text{Colourless}}{Na2ZnO2} + 2H2O}\]
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