Does anybody know if tables are available that indicate the boiling points of different solvents under vacuum.
I know they exist at universities etc. But, I have not seen them elsewhere.
Rgds BromicAcid - 27-5-2011 at 09:12
Solvent + Nomograph = Approx Boiling Point
At my university and my work we have nomographs posted on the wall for quick calculations of approximate boiling points, a bit more useful than
arbitrary pressures listed in many situations.peach - 28-5-2011 at 11:18
If you type 'nomograph' into google the first link will probably be the one on Sigma's page. If you already know the rough values, you can click away
on the nomograph to get an answer and be done with that.
But I'd highly recommend having a look at the tabs on the right of the window "pressure conversion", "temperature conversion" and "physical
properties". Physical properties is the one I find most useful, it's already loaded with information for most of what you'll be asking about.
If I scroll through the list and click "Dichloromethane" for example, all the properties and ranges appear in the data windows. If I type 2 degrees C
in the temperature box and click "Calc P", it gives me the pressure as 151.9 mmHg.
If I set the pressure as 50 mmHg and do the reverse, it tells me it'll be boiling at -19.8C.
It's be awesome if someone made a hand held calculator with all this jammed into it. I'll email Sigma. ;P
If you're feeling in the mood, you could plot a graph using the results from the sigma page at various pressures for a bunch of different solvents,
print and then laminate.
[Edited on 29-5-2011 by peach]The WiZard is In - 28-5-2011 at 13:52
Peach, do you use the pressure equalizing arm of your addition funnel as a straight edge to read your nomograph?
She not be long enough... Arh!
I've emailed Sigma to ask them to make a (specifically red) scientific calculator with all of the more common things (molar masses, densities, vapour
pressures, BP's, constants etc) built in with nomographs and pH calculators. I suggested they make it USB compatible so it can be reflashed with new
firmware.
Lets see if it happens. It'll be killer if it appears, I'll buy one.
Failing that... a flash version for portable devices? My mobile was third hand and I don't even use it anyway, so I'd prefer the calculator
personally.