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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: freeze0912 on October 18, 2008, 10:17:59 AM

Title: Redox titration
Post by: freeze0912 on October 18, 2008, 10:17:59 AM

I want to ask about redox titration of KMnO₄ and H₂C₂O₄
When KMnO₄ is added in H₂C₂O₄
There is an obersevration that brown colour solution is given out

If it is because of the complex of Potassium oxalate?

Title: Re: Redox titration
Post by: Borek on October 18, 2008, 11:30:56 AM

You don't start with brown - you start with purple.

This titration requires low pH, thus you should add sulfuric acid.

Permanganate gets reduced to Mn²⁺, oxalate gets oxidized to carbon dioxide.