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

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

Analytical Chemistry: Uses of Ammonium Hydroxide and Sodium Hydroxide | Chemistry | Class 10 | ICSE | Selina

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

Answer:

a) In the presence of hot concentrated caustic soda or hot concentrated sodium hydroxide, zinc reacts to form zincate sodium and hydrogen.

Zn + 2NaOH → Na₂ZnO₂ + H₂

b) Aluminum reacts with sodium hydroxide to form sodium aluminate (aluminum oxide), hydrogen, and sodium oxide.

2Al + 2NaOH + 2H₂O → 2Na₂AlO₂ + 3H₂

i

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