I opened the fuming chamber, and I didn't see any change after 12 hours. I
think it might be because it is too cold in the garage. It is about 0ΊC
(freezing) in the garage today.
I DAGS, but all the MSDS sheets I found for ammonia don't have the
evaporation point listed.
I know we have a few chemists here, does anyone know the evaporation point
Every neighbourhood has one, in mine, I'm him.
Remove the "splinter" from my email address to email me.
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The more important question is the rate of reaction of the ammonia with
your wood. Generally speaking chemical reactions are slowed by *about*
a factor of 2 per 10 degrees Celsius. So your instincts are correct,
its probably the low temperature that's the problem, not because of the
vapor pressure of the ammonia but because of the slower rate of
reaction with the wood. Wait until you have warmer weather.
I tried fuming my quarter sawn white oak table a few days ago at 72 degrees.
Nothing happened, so I even waited overnight (mid 60s) and still not much
visible change. I was rather disappointed. I used Ammonium Hydroxide 28%.
Poured about a pint of it into a glass baking dish. Most of it was
evaporated by morning. Any suggestions?
On Sun, 09 Nov 2003 19:14:01 GMT, "David F. Eisan"
You'll be working with a dilute aqueous solution, and if that freezes,
then it ain't going to happen...
I've also found that the reaction is annoyingly slow over Winter. I
fume in daylight, rather than my usual leaving it overnight. A little
heat might not hurt either - try a small lightbulb or cabinet heater.
Die Gotterspammerung - Junkmail of the Gods
It seems highly unlikely to me that you have "ammonia" at all to worry
about. More likely you have a bottle of reagent grade ammonium hydroxide. If
so, you aren't merely dealing with evaporation temperature but with how
quickly this solution is freeing ammonia into the atmosphere under the
tent.. But you will probably have to either raise the temperature
substantially (10-15 degrees C would be my guess) or be willing to wait a
very long time.
At even 0C ammonia must be kept under high pressure for it to remain
liquid. Did your ammonia come in a highly pressurized cylinder with dire
warnings all over it or in a bottle?
I am using 26% ammonium hydroxide solution.
I have shut the garage door, and I will run the heater tonight to keep the
garage at 10-15ΊC. Come morning, I will use the remote opener for the garage
and let the air clear before going in.
Thanks everyone for the help,
David the evaporation point isn't what you should be asking about.
It is the vapor pressure of the ammonia/water solution that is biting
you in the butt. A solution of 30% ammonia has a room temp (25°C)
vapor pressure of approx 1 atmosphere. Below room temp the VP
is lower than 1atm and less and less ammonia will evaporate the colder
the solution is. There are 2 fixes to your problem. Heat the ammonia
solution or use a stronger solution.
For more than you ever wanted to know on this subject see
Page 21 has the VP vs Temp chart.
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