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 Brine is a concentrated solution of sodium chloride.
 During electrolysis, the overall reaction is:
2NaCl(aq)+ 2H2O(l)
2NaOH(aq)+ Cl2(g)+H2(g)
 Hydrogen is discharged in preference to sodium:
2H+(aq) + 2e-
H2(g)
 As usuan at the cathode, this is reduction.
 Chlorine is discharged in preference to Oxygen:
2Cl- (aq)
Cl2 + 2e-
 As usual at the anode, this is oxidation.
 The two gases bubble off. Na+ and OH- ions are left
behind, giving a solution of sodium hydroxide. Some
of the solution is evaporated to a give more
concentrated solution, end some is evaporated to
dryness, giving solid sodium hydroxide.
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Used for making…
The plastic PVC
Solvents for degreasing and drycleaning
Medical drugs
Weedkillers and pesticides
Paints and dyestuffs
Bleaches
Hydrogen chloride and hydrochloric acid
It is also used as a sterilising agent, to kill bacteria in
water supplies and swimming pools
Used…
 In making nylon
 To make hydrogen peroxide
 To harden vegetable oils to make margarine
 As a fuel in hydrogen fuel cells
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Used in making…
Soaps
Detergents
Viscose and other textiles
Paper
Ceramics
Dyes
Medical drugs
 http://aquarius.nasa.gov/pdfs/electrolysis.pdf
 http://www.gcsescience.com/ex4.htm
 http://www.science.uwaterloo.ca/~cchieh/cact/c123/el
tlysis.html
 http://answers.yahoo.com/question/index?qid=20070
813195931AAttlJU
 http://www.elkadot.com/en/chemistry/Electrolysis%2
0of%20Molten%20Sodium%20Chloride.htm