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Topic: Decomposition of KNO3  (Read 23900 times)

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Offline jamesweltz

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Decomposition of KNO3
« on: June 02, 2007, 11:16:45 PM »
Does anyone know the products of the decomposition of KNO3? Could it be KNO and O2 or something completely different, such as KN3 and O2 or K2O and N2 and O2?

Offline UnintentionalChaos

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Re: Decomposition of KNO3
« Reply #1 on: June 03, 2007, 12:07:34 AM »
Standard thermal decomposition? IIRC it occurs at a fairly low rate, even at highly elevated temperatures, but it does break down releasing O2 and forming KNO2 (nitrate -> nitrite)

2KNO3 -(heat)-> 2KNO2 + O2

Offline jamesweltz

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Re: Decomposition of KNO3
« Reply #2 on: June 03, 2007, 03:02:15 PM »
At a higher temperature would it decompose to hyponitrite, KNO?

Offline UnintentionalChaos

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Re: Decomposition of KNO3
« Reply #3 on: June 04, 2007, 02:27:25 AM »
Hyponitrite doesn't exist.

When heated further, nitrite probably breaks down into a mix of potassium oxide and peroxide while releasing N2 gas or nitrogen oxides.

Offline hmx9123

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Re: Decomposition of KNO3
« Reply #4 on: June 08, 2007, 08:08:34 PM »
'Hyponitrite' is actually called nitrosyl, and it does exist, though it isn't common.  It's pretty reactive, and not all metal nitrosyls are known.  A prep for sodium nitrosyl (NaNO) is in Brauer's Handbook of Preparative Inorganic Chemistry, v.1, p.514.  It is made from Na metal and NO gas in a tube furnace.  Though it may be a transitory stage in the decomposition of KNO3, I somehow doubt it.  I would expect to get potassium oxides and nitrogen if heated further as UnintentionalChaos suggests.

Offline jamesweltz

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Re: Decomposition of KNO3
« Reply #5 on: June 10, 2007, 12:21:42 PM »
thanks
 :)

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