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verode
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Quote: Originally posted by bbartlog  | | Quote: | | or even try with aluminium powder |
That won't work; you will get sodium aluminate, to wit:
2Al + 2NaOH + 2H2O → 2NaAlO2 + 3H2
Magnesium however will do the job.
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you never heard Aluminotermia
I know Al react making aluminate but not if is dry and you
make to burn it not water at all
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verode
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you make Al burn with Mg burning or with glicerine and KMnO4
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hissingnoise
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| Quote: | | you never heard Aluminotermia |
Nope! Any relation to thermite?
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verode
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the same
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verode
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yes you must see
http://www.youtube.com/watch?v=i5IjDyyqIZE
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verode
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it's very very hot
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verode
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yu may also try with NaF and Al or Mg but it's more difficult
Sorry my english
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blogfast25
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All the aluminothermic and magnesiothermic attempts at making ‘chemical sodium’ that I’ve seen (and that’s quite a few) are half-failures at
best. One obtains a mixture of little sodium with a lot of slag which has proven inseparable up to and including now. At best you’ll have a few
grains of contaminated sodium that do indeed test positive with water…
If you do want to successfully make gram amounts of quite pure sodium metal, melt a good dollop of NaOH in a heat resistant ceramic (or even
glass) bowl, stick some graphite or steel electrodes in the melt and run a current of 5 – 10 A through it. Small globules of molten sodium will
metal appear at the cathode, which can be scooped up with a gauze (steel) wire ‘spoon’ and dropped into light mineral oil where they will settle
and solidify for later use. If you want to go all sophisticated use an argon or CO2 blanket to cover the ‘cell’ (and protect the sodium).
This is how Davy discovered the metal in 1807 (minus the Ar or CO2 – I saw a facsimile of the used apparatus at the British Museum, it was
extraordinarily primitive) and what’s good for him should be good enough for us!  Alternatively build len1’s Castner Cell…
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blogfast25
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In the case of 2 NaF + Mg --> 2 Na + MgF2 the reaction is likely to run so hot (heat of reaction) that the formed sodium will evaporate (well,
'zapped off' is probably a better term): sodium's BP is only 883 C. This would therefore have to carried out in a bomb reactor...
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