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Sodium Hydroxide Experiment With Electrolysis - PowerPoint PPT Presentation


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Sodium Hydroxide Experiment With Electrolysis. Mükremin Buğdacı. What is Brine ?. Brine is a concentrated solution of sodium chloride . During electrolysis , the overall reaction is: 2 NaCl( aq )+ 2 H2O(l) 2 NaOH( aq )+ Cl2(g)+H2(g). The Electrolysis. At the Cathode.

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Presentation Transcript
what is brine
What is Brine?
  • Brine is a concentratedsolution of sodiumchloride.
  • Duringelectrolysis, theoverallreaction is:

2NaCl(aq)+ 2H2O(l) 2NaOH(aq)+ Cl2(g)+H2(g)

at the cathode
At theCathode
  • Hydrogen is discharged in preferencetosodium:

2H+(aq) + 2e- H2(g)

  • As usuan at thecathode, this is reduction.
at the anode
At theAnode
  • Chlorine is discharged in preferencetoOxygen:

2Cl- (aq) Cl2 +  2e-

  • As usual at theanode, this is oxidation.
sodium hydroxide
SodiumHydroxide
  • 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.
chlorine a poisonous yellow green gas
Chlorine, a poisonousyellow-greengas

Usedformaking…

  • Theplastic PVC
  • Solventsfordegreasinganddrycleaning
  • Medicaldrugs
  • Weedkillersandpesticides
  • Paintsanddyestuffs
  • Bleaches
  • Hydrogenchlorideandhydrochloricacid

It is alsoused as a sterilisingagent, tokillbacteria in watersuppliesandswimmingpools

hydrogen a colourless flammable gas
Hydrogen, a colourlessflammablegas

Used…

  • Inmakingnylon
  • Tomakehydrogenperoxide
  • Tohardenvegetableoilstomake margarine
  • As a fuel in hydrogenfuelcells
sodium hydroxide solution alkaline and corrosive
Sodiumhydroxidesolution, alkaline andcorrosive

Used in making…

  • Soaps
  • Detergents
  • Viscoseandothertextiles
  • Paper
  • Ceramics
  • Dyes
  • Medicaldrugs
sources
Sources
  • http://aquarius.nasa.gov/pdfs/electrolysis.pdf
  • http://www.gcsescience.com/ex4.htm
  • http://www.science.uwaterloo.ca/~cchieh/cact/c123/eltlysis.html
  • http://answers.yahoo.com/question/index?qid=20070813195931AAttlJU
  • http://www.elkadot.com/en/chemistry/Electrolysis%20of%20Molten%20Sodium%20Chloride.htm