What is observed when hot concentrated caustic soda solution is added to (a) Zinc and (b) Aluminium oxide ? Write balanced equations.

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Solution

(a) 2 NaOH + Zn → $N a_{2} Z n O_{2}$ + $H_{2}$

(Sodium Zincate)

Zinc react with sodium hydroxide to produce sodium zincate and hydrogen.
This reaction takes place at a temperature near $550^{\circ}$ C

(b)
$A l_{2} O_{3}$ +2 NaOH → 2 $N a A l O_{2}$ + $H_{2} O$

Aluminum oxide react with sodium hydroxide to produce sodium aluminate and water. This reaction takes place at a temperature of 900-1100°C.

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