Synthesis and decomposition of chromium(VI)oxide peroxide

Dark blue chromium(VI)oxide peroxide is formed when a chromium(VI) salt is treated with acidified hydrogen peroxide.
This rapidly decomposes into green chromium(III)
Chromium(III) is less hazardous and this poses a good way to destroy hexavalent chromium waste.

Another method is treating it with warm ethanol. You can test if all the hexavalent chromium is gone by adding hydrogen peroxide and sulfuric acid afterwards, since this compound is really intensely coloured and thus a good indicator for chromium(VI) species.

Edit: Mistake: I've used sodium dichromate instead of ammonium dichromate, but that doesn't matter.

Category:

Science & Technology

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[CarnalDiafragma]

@Norfeldt

Yes, but you should see it in real life, the camera doesn't pick up the colours that good. It's even prettier in real life :)

[Norfeldt]

pretty reaction