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Author: Subject: sodium carbonate - wikipedia - what?
learningChem
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[*] posted on 12-8-2012 at 18:36
sodium carbonate - wikipedia - what?


I was wondering if sodium carbonate could be thermally decomposed to sodium oxide - it seems the answer is "no".

http://en.wikipedia.org/wiki/Sodium_carbonate
mp 851 - boils at ~1630

Funny thing is, according to wikipedia too...

http://en.wikipedia.org/wiki/Sodium_bicarbonate

"Above 70 °C, sodium bicarbonate gradually decomposes into sodium carbonate"

"Further heating converts the carbonate into the oxide (at ca. 1000 °C):

Na2CO3 → Na2O + CO2 "

Am I misreading something, or is the sodium bicarbonate article laughably wrong?

[Edited on 13-8-2012 by learningChem]
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[*] posted on 12-8-2012 at 18:47


Some reactions occur indeed but at some punky ridiculius rate!



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[*] posted on 13-8-2012 at 06:50


Some decomposition may occur at above a 1000 C but it is very slow and not practical as a means of making sodium oxide.
Look at the use of calcium carbonate which was converted to calcium oxide, slaked to produce lime and then reacted with sodium carbonate to produce sodium hydroxide, this remained the route to caustic soda for a very long time.
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Nicodem
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[*] posted on 13-8-2012 at 07:10


Quote: Originally posted by learningChem  
Am I misreading something, or is the sodium bicarbonate article laughably wrong?

What is laughable is to blindly believe Wikipedia without checking the references.
First of all, it is an encyclopedia, thus a tertiary source, which means there could have been several mistakes done in the interpretation and citation. Secondly, it is a freely editable encyclopedia that is simply too huge to peer review. We are lucky that it is as good&bad for chemistry as it is. It could be much worse.




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[*] posted on 15-8-2012 at 12:11


Thanks for the replies =]
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Antimony Pentafluoride
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[*] posted on 15-8-2012 at 20:26


Ahahah wikipedia :p

I checked Patnaik's Handbook of Inorganic Chemistry (<3) to see if there was any mention of the thermal decomposition to sodium oxide, and there was not. However, it does say that sodium monoxide can be produced by reacting sodium metal with nitrous oxide (maybe by passing a stream of nitrous oxide into molten sodium? idk, the book did not specify conditions for the reaction).

Alternately if sodium is heated to below 160° (presumably between 120 and 160) with a limited oxygen supply, the monoxide is formed. That sounds pretty tricky. iirc Nerdrage made sodium peroxide (and probably a tiny bit of the superoxide) by passing a stream of oxygen into sodium that had been heated in crucible.
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[*] posted on 18-8-2012 at 18:24


Actually it was Myst32YT
https://www.youtube.com/watch?v=ZqEWUw6sgpA&feature=plcp
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[*] posted on 19-8-2012 at 15:40


Quote: Originally posted by Fossil  
Actually it was Myst32YT
https://www.youtube.com/watch?v=ZqEWUw6sgpA&feature=plcp


Whoops, my bad. Thanks for the correction.
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