I found the following reaction on the internet:
2NaNO3----> 2NaNO2 +O2
But the problem is that NaNO2 got a lower decomposition temperature than NaNO3.
So what will NaNO2 decompose to?
May be the reaction will be as following: 2NaNO2---->Na2O +N2O +O2?
Or the products will be Na2O + NO2 + NO?ScienceSquirrel - 6-1-2011 at 08:36
Not in my experience.
I have made small amounts of sodium nitrite by heating the nitrate until it liquifies and then keeping it liquid until gas evolution slmost ceases.
There is a video here;
Well, I just did that (I think), a white solid has formed, did you received the same results?Mixell - 6-1-2011 at 08:53
On another topic, is it possible to isolate K2MnO4 from a 1:1 mole mix of K2MnO4 and MnO2?
May be it will be soluble in ethanol?ScienceSquirrel - 6-1-2011 at 08:55
It is pretty much white solid to white solid so it is hard to tell if you heated it hard enough.
Heating it too hard will result in brown fumes and the product will be very strongly alkaline when dissolved in water.
Tests for nitrite are here;
On another topic, is it possible to isolate K2MnO4 from a 1:1 mole mix of K2MnO4 and MnO2?
May be it will be soluble in ethanol?
Potassium permanaganate is soluble in water and crystallises well, manganese dioxide is completely insoluble.Mixell - 6-1-2011 at 09:19
Brown fumes did not appear, but oxygen gas was formed (I did everything exactly as you).
potassium manganate (K2MnO4) reacts with water to form MnO2 and KMnO4...Mixell - 6-1-2011 at 09:19
double post
[Edited on 6-1-2011 by Mixell]ScienceSquirrel - 6-1-2011 at 09:28
Brown fumes did not appear, but oxygen gas was formed (I did everything exactly as you).
potassium manganate (K2MnO4) reacts with water to form MnO2 and KMnO4...
I would guess that you have a solid containing sodium nitrite then, you just have to test it.
Sorry my fault, you are talking about potassium manganate not potassium permanganate.
It can be prepared in aqueous solution and crystallised from aqueous solution.
It should be noted that the manganate ion is stable in alkaline solution while the permanganate ion is stable in acid solution.
[Edited on 6-1-2011 by ScienceSquirrel]unionised - 6-1-2011 at 09:43
I suspect potassium manganate will oxidise alcohol rapidly.
Water will dissolve the manganate but not MnO2. Some will disproportionate so you might get a better yield by adding KOH to the water first.
