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Topic: Orange color in bad permanganate-oxalate titration  (Read 3509 times)

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Offline whmice

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Orange color in bad permanganate-oxalate titration
« on: March 23, 2008, 03:38:13 PM »
Hello
a few weeks ago i analyzed hydrogen peroxide in detergents with potassium permanganate. i used sodium oxalate to calibrate my solution.
in one of my oxalate titrations i added permanganate too quickly and my solution   turned orange-brown with black precipitates(before calculated end point). where could this color come from?
titrated 0.1994 grams of disodium oxalate : 1.49E-3 mole
orange color appeared after titrating 23.4 ml in less than 10s of permanganate 0.0181M for a total of 4.23E-4 mole. theoreticaly needed 5.95E-4 mole
thanks
Daniel

Offline Borek

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Re: Orange color in bad permanganate-oxalate titration
« Reply #1 on: March 23, 2008, 03:47:32 PM »
MnO2
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