Question

Complete the statement using every given option.

During the extraction of aluminium.........

Heating the aluminium ore with concentrated caustic soda.

Answer 1

When aluminium ore is heated with caustic soda (NaOH) solution under high pressure for 2 to 8 hours at 140° - 150° C, water-soluble sodium aluminate is formed.

$$\mathrm{Al}{\phantom{A}}_2\mathrm{O}{\phantom{A}}_3+2\mathrm{NaOH}⟶2\mathrm{NaAlO}{\phantom{A}}_2+\mathrm{H}{\phantom{A}}_2\mathrm{O}$$