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  Potassium Permanganate

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Author Topic:   Potassium Permanganate
Paul
A New Voice 		posted December 10, 1999 12:30 AM     Click Here to See the Profile for Paul   Click Here to Email Paul     
I have a simple question. I bought some potassium permanganate about a month ago in a little 6 oz bottle. When I opened it up I saw that it wasn't powdered so I put ground some up and stored it in a zip-lock baggy. I now noticed that it is turning a darker black color when it use to be a dark purple. Is it decomposing to manganate oxide? Is it still useful? Should I leave it in larger crystal form?

fireworkboy@hotmail.com
unregistered 		posted December 10, 1999 03:57 AM           
Paul, I don't know too much about KMno4 but as far as I know yes it is turning into an oxide of some type. Its happend to me befor and it still works fine when it is the dark colour. **MATT**

HMTD Factory
Frequent Poster 		posted December 10, 1999 05:45 AM     Click Here to See the Profile for HMTD Factory     
It's turning into MnO2 I guess, maybe you
contaminated it when you ground it, or it's too wet.

If you put water in KMnO4 and let it dry, guess what? not purple any more! Brown!

All times are ET (US)

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