Tuesday, January 10, 2012

Particular uses of titrations and titration curves and Acid number, Iodine number, Saponification value, Karl Fischer titration

  • As applied to biodiesel, titration is the act of determining the acidity of a sample of WVO by the dropwise addition of a known base to the sample while testing with pH paper for the desired pH=8.5 reading. By knowing how much base neutralizes an amount of WVO, we discern how much base to add to the entire batch.

  • Titrations are a very common procedure held in secondary education, to assess a chemistry student's practical aptitude.
  • Titrations in the petrochemical or food industry to define oils, fats or biodiesel and similar substances. An example procedure for all three can be found here:
o Acid number: an acid-base titration with colour indicator is used to determine the free fatty acid content. See also: pH of fatty acids.

o Iodine number: a redox titration with colour indication, which indicates the amount of unsaturated fatty acids.

o Saponification value: an acid-base back titration with colour indicator or potentiometric to get a hint about the average chain length of fatty acids in a fat.

o Karl Fischer titration a method to analyse trace amounts of water in a substance


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