metalresearcher
National Hazard
![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif)
Posts: 737
Registered: 7-9-2010
Member Is Offline
Mood: Reactive
|
|
Al + NaOH reacts slowly
According to this video
http://www.youtube.com/watch#!v=yh7SKa18EH0
NaOH reacts with aluminum. So I tried out some Al snippets (cut from a sheet of Al) mixed with some NaOH pellets (each ca. 1 gram) and put this into a
steel tube (2.5cm diameter x 5cm length) with one open end.
I heated the tube to dull red hot (ca 600oC) and saw yellow flames appearing in the tube. It was a mild reaction. Does hydrogen evolve or Na metal ?
With Mg then sodium metal appears ( tried that as well with Mg filings).
|
|
MadHatter
International Hazard
![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif)
Posts: 1333
Registered: 9-7-2004
Location: Maine
Member Is Offline
Mood: Enjoying retirement
|
|
Sodium Aluminate
2 Al + 2 NaOH + 2 H2O ----> 2 NaAlO2 + 3 H2
The reaction releases hydrogen rapidly. This is how I used to create hydrogen to fill balloons.
From opening of NCIS New Orleans - It goes a BOOM ! BOOM ! BOOM ! MUHAHAHAHAHAHAHA !
|
|
bquirky
Hazard to Others
![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif)
Posts: 316
Registered: 22-10-2008
Location: Perth Western Australia
Member Is Offline
Mood: No Mood
|
|
Its worth noting that the presence of even a small amount of zinc will dramaticly slow down the reaction between Al and NaOH The zinc will plate
itself out of the solution onto the aluminium reducing the available Al surface area.
Im not 100% sure how this works in a high temperature melt though.
This is a method that has been proposed to slow down the self discharge rate of Al primary battery's
|
|
Texium
|
Thread Moved 19-11-2023 at 16:09 |