From: David Kelly (KellyDR$##$Cardiff.ac.uk)
Date: Mon Jul 15 2002 - 14:00:23 EDT
Copper sulphate impregnated molecular sieves? Are you sure this is
not silica gel?
To dry sieves efficiently you need to use a vaccum oven/pistol and
circa 250 degrees C for 3+ hours. Any attempt to dry in the
atmosphere leaves them wet. We have taken circa 100g of oven dried
sieves and subjected them to heating in vacuum. In the early stages
sufficient water was removed to wet the inside of the apparatus.
Good drying agents require severe drying conditions to
make them anhydrous.
While we are on lab myths. Drying magnesium turnings in an ordinary
oven is also totally pointless.
Good luck
DaveDr David R. Kelly
Dept. of Chemistry, Cardiff University, PO Box 912, Cardiff, CF10
3TB, UK
Phone 02920-874063: Fax 02920-874030
Mobile 07971-240448: Home 02920-610891
Web page http://www.cf.ac.uk/uwc/chemy/staff/kelly.html
For the "Elephants and Butterflies" article see
http://www.semiochemica.org.uk/articles/articlesidx.html
BEST Record: http://expertise.cos.com/cgi-bin/exp.cgi?id=498275
For catalysis see http://www.chemsoc.org/cgi-
shell/events/nforedisp.pl?ID=551
Cardiff University is the public name of the University of Wales,
Cardiff, a constituent institution of the
University of Wales.
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