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Redox titration

Redox titration is based on transfer of electron from reducing agents to oxidizing agents.
Oxidation – loss of electron
Reduction – gain of electron
Oxidizing agents gains electrons and reduce to lower oxidation state whereas reducing agent losses electrons and oxidize to higher oxidation state. Oxidation and reduction occurs simultaneously and so called as redox titration or oxidation-reduction titration.

Oxidizing agents:
Potassium permanganate
Potassium iodide
Ceric ammonium sulphate

Reducing agents:
Oxalic acid
Sodium thiosulphate
Ferrous ammonium sulphate
Titanium sulphate

Application of Redox titration:
For determination of metals like Ca, Mg, Co, Ni, Iron etc
For determination of dissolved oxygen, hydrogen peroxide and anions such as NO2-, Cl, Br-, SO32- To determine oxidized state of elements

Indicator used in redox titration are shown as following:


Indicator Color change
  Oxidized form Reduced form
Starch Blue Colorless
Diphenylamine Violet Colorless
Diphenylbenzidine Violet Colorless
Methylene blue Blue Colorless
Diphenylaminesulphonic acid Red-violet colorless

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