Interaction | Reaction | Process     Data Page

Iron(II) is oxidised to iron(III) with dichromate(VI) solution, and the reaction is an example of a redox titration.

A redox indicator, usually sodium diphenylaminesulphonate, is required. Otherwise, the colour change is not very distinct. Protons are provided by dilute sulfuric acid or dilute hydrochloric acid as there are redox problems with most other mineral acids.

Note the 6:1 mole ratio between Fe2+ and Cr2O72–.

6
Fe2+
  +  
[Cr2O7]2–
  +  
14
H+
         
6
Fe3+
  +  
2
Cr3+
  +  
7
H2O
Reactant Page Go To Go To
Iron(II) ion     Reactions Using    Reactions Forming
Dichromate(VI) ion     Reactions Using    Reactions Forming
Proton     Reactions Using    Reactions Forming
Iron(III) ion     Reactions Using    Reactions Forming
Chromium(III) ion     Reactions Using    Reactions Forming
Water     Reactions Using    Reactions Forming

Interaction, Reaction, Process defined as:
British A-Level Chemistry: A2
Oxidation: Of Substrate By Reagent
Redox

© Mark R. Leach 1999 –


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