Bedlasky
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Dehydratation of FeO(OH) and CaSO4
Hello.
I had some hydrated ferric oxide and calcium sulphate dihydrate from experiments I've made long ago. So I decided to dehydrated them in oven at
275°C. But I am little confused from result of this dehydration.
CaSO4 isn't white but beige. Is this normal or is it contaminated by some organic impurities?
Ferric oxide isn't red but black. Why?
 
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fusso
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Try magnet test. If it's attracted to magnet it's Fe3O4.
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Ubya
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most ferric oxide produced with wet chemistry is black. look at nurdrage's video on the preparation of ferric oxide for thermite, he uses 3 methods,
and only the electrolytic one gives red iron oxide
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Bedlasky
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I tried this and it had not attracted to magnet.
Quote: Originally posted by Ubya  | | most ferric oxide produced with wet chemistry is black. look at nurdrage's video on the preparation of ferric oxide for thermite, he uses 3 methods,
and only the electrolytic one gives red iron oxide |
Thanks!
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CharlieA
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Am I correct in assuming that Fe3O4 is a typo? Or is this FeO(dot)Fe2O3. I am not familiar with this substance.
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oberkarteufel
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No, it's not a typo. This compound contains iron on both +III and +II oxidation states. There's also an oxide Pb3O4 with +II and +IV lead atoms.
Edit: Naturally occuring Fe3O4 is known as magnetite.
[Edited on 2-5-2019 by oberkarteufel]
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CharlieA
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| Quote: Originally posted by oberkarteufel | No, it's not a typo. This compound contains iron on both +III and +II oxidation states. There's also an oxide Pb3O4 with +II and +IV lead atoms.
Edit: Naturally occuring Fe3O4 is known as magnetite.
Thank you. I have learned something and that is a good think
Charlie A |
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