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Author: Subject: KMnO4 + HCl --> Metallic precipite?!
ssdd
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[*] posted on 7-10-2007 at 11:04
KMnO4 + HCl --> Metallic precipite?!


So recently in lab I had to add a small amount of KMnO4 to a test tube of 6M HCl. The solution turned dark brown with bubbling and some heat. But when I turned the tube on it's side I was suprised to find a small amount of metallic like substance stuck to the side of the tube. I attempted to isolate it and could not. The reaction does not call for this, but I was thinking perhaps some Mn metal? I am baffled so if anyone has any ideas that would be great.

**The tube was new so impurities are limited.

-ssdd




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[*] posted on 7-10-2007 at 11:27


KMnO4 + 8HCl = KCl + MnCl2 + 2.5 Cl2 + 4H2O

You might've been seeing a higher, possibly mixed oxidation state of Mn (in the above reaction, exchange some MnCl2 + Cl2 for "MnCl3" or "MnCl4"), complexed with Cl, as a metallic glint.

Kind of like your sig.

There's certainly nothing metallic going on here, as Mn metal reacts vigorously with HCl.

Tim




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ssdd
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[*] posted on 7-10-2007 at 11:51


Thanks that helps, these unexplained things bug the crap out of me so I ask.

Thanks again,
-ssdd




All that glitters may not be gold, but at least it contains free electrons.
-- John Desmond Baernal
http://deepnorth.info/
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