# What Do You See When Sodium Hydroxide Solution is Added to Zinc Sulphate Solution, Till It is in Excess? - Chemistry

Short Note

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

#### Solution

When sodium hydroxide solution is added to zinc sulphate solution, till it is in excess whi te gelatinous precipi tates of Zn (OH)2 are formed and due to the excess of sodium hydroxide these ppt. get dissolved immidiately :
$\ce{ZnSO4 + 2NaOH ->\underset{\text{white gelatinous ppt.}}{Zn(OH)2 + Na2SO4}}$
$\ce{Zn(OH)2 + 2NaOH ->\underset{\text{colourless}}{Na2ZnO2} + 2H2O}$

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#### APPEARS IN

Frank ICSE Class 10 Chemistry Part 2
Chapter 4 Analytical Chemistry
Exercise | Q 4 | Page 87