Interaction | Reaction | Process     Data Page

This reaction is used is the determination of iodide by titration.

The starch acts as an indicator because starch and iodine form a deep blue-black complex.

2
Na2S2O3
  +  
I2
  +  
Starch
         
Na2S4O6
  +  
2
NaI
Reactant Page Go To Go To
Sodium thiosulfate     Reactions Using    Reactions Forming
Iodine     Reactions Using    Reactions Forming
Starch Indicator    Reactions Using    Reactions Forming
Sodium tetrathionate     Reactions Using    Reactions Forming
Sodium iodide     Reactions Using    Reactions Forming

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

© Mark R. Leach 1999 –

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