Question
What do you observe when caustic soda solution is added to the following solution: first a little and then in excess : $ZnSO_4$

Answer

$ZnSO _4+2 NaOH \longrightarrow \underset{\text { White gelatinous ppt. }}{ Zn ( OH )_2 \downarrow}+ Na _2 SO _4$

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