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Electrolysis (Real uses (Electrolysis of brine to make: (H2 (for…
Electrolysis
Real uses
Electrolysis of brine to make:
H2
for margarine
Cl2
for water/bleach
NaOH
for soap
Electrolysis of Al203 to make Al
Purification of copper
Electroplating
Examples:
PbBr2(l) = Pb + Br2
Cathode: Pb2+ + 2e- = Pb
Anode: 2Br- = Br2 + 2e-
2Al203(l) = 4Al + 3O2
Cathode: Al3+ + 3e- = Al
Anode: 2O2- = O2 + 4e-
Electrolysis of solution (aq)
Rules
Anode: Discharge grp 7 ion of no grp 7, discharge OH-
Cathode: Discharge least reactive
It is the decomposition of a compound using electricity.
Electrolysis of Molten Compounds (l)
Electrolyte (a liquid which conducts electrical charge)
Cathodes attracts positive ions + reduces them
Anode attracts negative ions + oxidises them
Electrode (Inert material, eg graphite)
