[meteorite-list] RE: Not a happy 'Campo'
From: mark ford <markf_at_meteoritecentral.com>
Date: Thu Apr 22 10:32:50 2004
Methylated spirits has 'Pyridine' added to stop people drinking it. This =
has exactly the same boiling point as ethanol (allotropic) so apart from =
the water content, methylated spirits evaporate and leave no residue.
Over here (UK) Methylated spirits is much cheaper than Isopropanol, I =
guess it doesn't matter what alcohol you use as long as the Sodium =
Hydroxide dissolves in it. As you say you likely need a small water =
content to help with NaOH solubility. Methylated spirits has some water =
in it, so takes up some sodium hydroxide. - hey it works for me!
From: Matson, Robert [mailto:ROBERT.D.MATSON_at_saic.com]=20
Sent: 12 March 2004 18:57
To: 'Howard Wu'; mark ford; Bob C.; meteorite-list_at_meteoritecentral.com
Subject: AD:Not a happy 'Campo'
Hi Howard, et. al.,
> Most Pure ethanol still has 4% water. Why not use 99% isopropanol,=A0
> for the money probably the best buy.=A0
I think denatured alcohol is higher than 96% ethyl alcohol; however, the
impurities put in=A0to make it undrinkable (and thus comparatively cheap
since it isn't taxed like liquor) remind me that I should look into what
those impurities ARE.=A0 Could be that when denatured alcohol =
it leaves behind the sticky residue of whatever those impurities happen
to be, and that might not be so good for meteorites.
I'd be surprised if isopropanol was any cheaper per gallon than =
alcohol -- always seems pretty expensive at the drugstore.=A0 And if =
using either ethanol or isopropanol as a soaking solution with sodium
hydroxide, you're going to have to add water anyway -- I don't think
NaOH is very soluble in either one.
Received on Mon 15 Mar 2004 03:43:07 AM PST