The simplified diagram below shows the Hall Cell that is used for the industrial production of aluminium - VCE - SSCE Chemistry - Question 6 - 2006 - Paper 1
Question 6
The simplified diagram below shows the Hall Cell that is used for the industrial production of aluminium.
**a.** In circles X and Y in the diagram, show the polarit... show full transcript
Worked Solution & Example Answer:The simplified diagram below shows the Hall Cell that is used for the industrial production of aluminium - VCE - SSCE Chemistry - Question 6 - 2006 - Paper 1
Step 1
Show the polarity of the electrodes in circles X and Y
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Answer
In circle X, the electrode is the anode, which is positively charged, and in circle Y, the electrode is the cathode, which is negatively charged.
Step 2
In the Hall Cell, the electrolyte consists of alumina mixed with another compound. In box Z, write the name or the formula of this compound.
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Answer
The compound in box Z is cryolite or Na₃AlF₆.
Step 3
Write a half equation for the reaction that occurs at the anode.
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Answer
At the anode, the half equation is:
ightarrow ext{O}_2 + 4e^-$$
Step 4
Write a half equation for the reaction that occurs at the cathode.
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Answer
At the cathode, the half equation is:
ightarrow ext{Al}$$
Step 5
Write an equation for the half reaction that would occur at the cathode with Al(NO₃)₃ solution.
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