I was trying to make sodium meta phosphate from NaH2PO4 by heating it in a old stainless steel crucible. After hearing for a bit it reached a
temperature over 600°c judging from the cherry red color of the crucible. All of a sudden the smaller bubbles started to show up which makes a
popping sound similar to hydrogen and some of the larger ones you can see a yellow sodium flame.
I quickly stopped and cooled down the mix. The result was a green colored(similar to FeCl2) glassy solid(Fe contamination).
What could the bubbles be. It seems to immediately stop after it is no longer is in contact with my torch.
I'm scared that it could be P4 or phosphine.
The crucible is old and it may have contamination of other metals(maybe even Aluminium or magnesium) from my older projects.walruslover69 - 6-7-2018 at 18:57
water is released in the conversion to meta phosphate. at temperatures that high the water will instantly turn to steam. It can be quite violent. Foeskes - 6-7-2018 at 21:25
It still doesn't explain the visible flame though. wg48 - 7-7-2018 at 00:45
It still doesn't explain the visible flame though.
I would think it was H2 burning yellow from contamination with Na. The H2 produced from the acid salt as it desolves the metal container or its metal
contamination.
PS: If your not certain about what the gas is you should perform the experiment outside in the open or in a fumehood.
[Edited on 7-7-2018 by wg48]unionised - 7-7-2018 at 03:19
How did you not expect an acid to react with the steel?wg48 - 7-7-2018 at 05:16
