Extracting Aluminium Flashcards
1
Q
What are the conditions for extracting aluminium and why?
A
Aluminium oxide dissolved in molten cryolite at temperature of 900c as its cheaper and easier
2
Q
What are the electrodes made out of when extracting aluminium and why?
A
Graphite as they’re a good conductor of electricity
3
Q
Why does molten aluminium oxide conduct electricity?
A
It contains free ions
4
Q
What does the liquid contain when extracting aluminium?
A
Molten cryolite and aluminium oxide
5
Q
Where are the aluminium ions attracted to in the electrolysis of aluminium?
A
Negative electrode (cathode)
6
Q
In the electrolysis of aluminium, what is the ionic half equation at the positive electrode?
A
2O2- —> O2 + 4e-
7
Q
In the electrolysis of Al, what’s the ionic half equation at the cathode?
A
Al3+ + 3e- —> Al
