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Chemistry Forums for Students => Inorganic Chemistry Forum => Topic started by: annazbylut on March 12, 2008, 11:49:31 AM

Title: Products from reaction Na + O2
Post by: annazbylut on March 12, 2008, 11:49:31 AM
Product from  reaction Na + O2 is Na2O2 or Na2O. It depend on   temperature, preesure or something else?
Title: Re: Products from reaction Na + O2
Post by: Arkcon on March 12, 2008, 12:02:01 PM
Here's a quick cut n' paste from Wikipedia:

Na2O forms when sodium is treated with oxygen.

    4 Na + O2 → 2 Na2O

Burning sodium in air will produce Na2O and about 20% sodium peroxide Na2O2.

    6 Na + 2 O2 → 2 Na2O + Na2O2

Pure Na2O can be prepared by reaction of liquid sodium with NaNO3.

    10 Na + 2 NaNO3 → 6 Na2O + N2

In the case of burning sodium in air, what you'll get isn't rigidly defined by reaction conditions, as I recall, perhaps it's an equilibrium between Na2O and Na2O2 ?

*[EDIT]*
Dang subscripts.
Title: Re: Products from reaction Na + O2
Post by: Borek on March 12, 2008, 12:14:38 PM
Quote from: Arkcon on March 12, 2008, 12:02:01 PM
Na2O forms when sodium is treated with oxygen.

    4 Na + O2 → 2 Na2O

Which is in obvious contradiction with "burning in air gives mixture". Peroxide article states "Sodium peroxide can be synthesized by direct reaction with sodium and oxygen at 130 - 200 °C."
Title: Re: Products from reaction Na + O2
Post by: AWK on March 12, 2008, 01:49:15 PM
But this range of temperature is difficult to keep during burning. Usually temperature without control is above 1000 C