shaheerniazi
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heating manganese dioxide in air
I acquired some manganese dioxide from a 9 volt battery and wikipedia says that if you heat it to below 800 celsius then it decomposes to its alpha
form mangasese(III)oxide or dimanganese trioxide.
When I did that the result was a brown powder, was it dimanganese trioxide?
[Edited on 30-11-2013 by shaheerniazi]
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gsd
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Heating MnO2 at high temperature converts it into lower oxidation states by releasing O2
4MnO2 -----> 2Mn2O3 + O2
3MnO2 -----> Mn3O4 + O2
BTW if your MnO2 is from battery, then it is mixed with appreciable quantity of carbon which will on heating yield:
2MnO2 + C ------> 2MnO +CO2
The easy test is react that brown powder with dilute H2SO4, if vigorous reaction happens then appreciable quantity of MnO is present.
gsd
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shaheerniazi
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but MnO is green.
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shaheerniazi
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My looked like this:
http://i40.tinypic.com/vxi6tl.jpg
http://i44.tinypic.com/2zqfsyh.jpg
I wonder what those silver flakes are in the third pic, are those manganese flakes
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