123172 Laboratory Module 1 Ouestions AlzOg is dissolved in molten cryolite and aluminium. What...

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123172 Laboratory Module 1 Ouestions AlzOg is dissolved in molten cryolite and aluminium. What effect does a change in a) The cell Potential is one of the reactants in the manufacture of alumina concentration have on production l. b) The energy requirements for aluminium (Hint: this relates to part B of the lab work) Z. If you didn,t use a carbon anode but instead had an "inert" anode (these have been developed) then the reaction would be: 2AlzOz --' 4AI+ 3Oz so oxygen is evolved instead of COz a) In what form is the energy supplied Ui Witt this require 1nor.
	
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123172 Laboratory 
of
in the manufacture 
of the reactants 
and is one 
in molten cryolite 
is dissolved 
l. AlzOg 
on
have 
in alumina concentration 
does a change 
What effect 
aluminium. 
a) The cell 
Potential
production
for aluminium
requirements 
b) The energy 
the lab work)
to part B of 
(Hint: this relates 
(these have been
"inert" anode 
had an 
but instead 
a carbon anode 
you didn,t use 
Z. If 
be:
reaction would 
then the 
developed) 
--' 
4AI+ 3Oz
2AlzOz 
COz
instead of 
is evolved 
so oxygen 
supplied
is the energy 
a) In what form 
process?
traditional 
than the 
electrical energy 
1nor. oi leiJ 
Witt this require 
Ui 
(whY?)
a process have?
might such 
other advantages 
c) What 
work)
part A of the lab 
relates to 
(Hint: this 
in hot aqueous
be dissolved
(Na3AlF6)' It can also 
fluoride 
in molten 
3. AlzOl dissolves 
from aqueous
of Al3*
tnui. by electrolysis 
aluminium not 
Why is 
NaOH solution. 
potentials.
standard electrode 
in terms of 
solution? Discuss 
the lab work)
to part C of 
(Hint: this part relates

David · Accepted Answer

1) The reactions involved in the aluminum extraction process is – 
   
 
 
2 3+
2 3
3+
2
2
2 2
2Al O 6O 4Al
At cathode: 4Al 12 4Al
At anode: 6O 3O 12
C +O CO
aq aq
aq e
aq e


 
 
 
 

 
a) To calculate the cell potential – 
2
3
O0
4
3+
P0.0592
log
Al
cell cellE E
n
 
  
  
 
So for every increasing 1 M concentration of alumina, there would be increased concentration 
and pressure of the products.

123172 Laboratory Module 1 Ouestions AlzOg is dissolved in molten cryolite and aluminium. What effect does a change in a) The cell Potential is one of the reactants in the manufacture of alumina...

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