Pete,
"Pure" water has a pH closer to 5.6, because of
CO2(g) + H2O(aq) -> CO2(aq) + H2O(aq) -> H2CO3(aq)
This is an equilibrium reaction, but I can't take the time to figure out how
to get the symbol for opposing arrows. But I doubt that this is enough of a
change to trigger litmus paper, it (litmus paper) is not very sensitive.
Some of the other more sensitive pH strips might show a change, but I
specifically am looking for something that will change with liquid water and
not high humidity as well. Thanks.
Bev
-----Original Message-----
From: <Peter George Duncan> [mailto:[log in to unmask]]
Sent: May 24, 2001 10:52 PM
To: [log in to unmask]
Subject: Re: [TN] Permanent Moisture Sensitivity Indicators?
I thought litmus paper would only get wet in water, and get dry again once
exposure ended - it wouldn't change colour because water (pure H2O anyway)
is pH-neutral.
Pete Duncan
"Blomberg, Rainer
(FL51)" To: [log in to unmask]
<rainer.blomberg@HONE cc: (bcc: DUNCAN
Peter/Asst Prin Engr/ST Aero/ST Group)
YWELL.COM> Subject: Re: [TN]
Permanent Moisture Sensitivity
Sent by: TechNet Indicators?
<[log in to unmask]>
05/24/01 08:45 PM
Please respond to
"TechNet E-Mail
Forum."; Please
respond to "Blomberg,
Rainer (FL51)"
How about something like Litmus paper? I like the dissolving/stain
solution.
R. G. Blomberg
Honeywell - Space Systems
-----Original Message-----
From: Bev Christian [mailto:[log in to unmask]]
Sent: Wednesday, May 23, 2001 6:29 PM
To: [log in to unmask]
Subject: [TN] Permanent Moisture Sensitivity Indicators?
TechNetters,
Hann asked this same sort of question May 9th and I am not aware of any
answers being posted. Certainly not with the same title (searched
archives).
Ever have clients dunk your hard work in water and then claim that you
couldn't make good product? Do any of you know of any really small,
moisture indicator strips that permanently changed color when they are
dunked in liquid water, as opposed to just being exposed to high humidity
for long periods of time? I know, I know a tall order. Any help would be
appreciated. Thanks.
Bev Christian
Research in Motion
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