Do you feel that a drying tube situated in series with the gas chamber and the outlet tube is necessary? According to what I have read, the HCl gas created with CaCl2 is much drier than creating the gas with H2SO4.I haven't noticed any difference "passing the gas"
using the H
2SO
4 method vs CaCl
2.
I've never encountered need for drying tube for any gassing method.
(I never calculate anything when gassing, j will water the and I dry everything in vacuum dessicator anyway.
How much do you start with? I'm talking quantity for the HCl and CaCl2. You use an equal amount of both, right?HCl
(aq) amount depends of the freebase you're gassing, obviously. CaCl
2 is dirt cheap and you can even dry it and use it one more time
I usually just fill the 1/4 of the erlenmeyer with CaCl
2, Don't let it go too wet, use always excess. If it gets too damp, just replace it with fresh batch.
It's always good to dry the product in vacuum dessicator