Question

reaction of aluminium with Aluminium Sulphate

Answer 1

Reactions:

With dilute NaOH(sufficient), Al2(SO4)3 + 6NaOH → 2Al(OH)3 + 3Na2SO4.

With concentrated NaOH(excess), Al2(SO4)3 + 8NaOH → 2Na[Al(OH)4] +3Na2SO4.

At higher temperature, Al2(SO4)3 + 8NaOH → 2NaAlO2 + 3Na2SO4 + 4H2O.

Note: Na[Al(OH)4] is the hydrated form of NaAlO2 and at higher temperature, water is released.