Question

What role is played by CO2 in getting pure alumina (A1l2O3) in the extraction of aluminium?​

Answer 1

Answer:

CO2 reacts with the Na and Aluminium complex to give hydrated alumina which is then heated to give pure alumina

Undissolved impurities are separated by neutralization with CO2

Answer 2

CO2 reacts with the Na and Aluminium complex to give hydrated alumina which is then heated to give pure alumina.