Andosing

Question 1

Aim?

Answer 1

Coat a layer of aluminium at aluminium object at anode

Question 2

Electrolyte used?

Answer 2

H2SO4 (aq)

Question 3

Cathode?

Answer 3

Inert electrode

Question 4

Two reactions at anode?

Answer 4

1. 2H20(l) -> O2(g) + 4H+(aq) + 4e-

2. 4Al(s) + 3O2(g) -> 2Al2O3(s)

Question 5

Why oxygen needs to be formed first?

Answer 5

Reacts with aluminium surface to for a thick layer of oxides