Listers,
For those of you with a high bandwidth connection (or lots
of time and a dialup) here is an interesting video segment
demonstrating what happens when a copper (U.S.) penny is placed in a
silver ion solution:
http://www.wsu.edu/~honrchem/CHEMCD/VDEMO/V00005.HTM
The file is over 5 MB and will take a while to download even at 56k
but is very dramatic. As you will notice when the silver-ion
solution is being poured the reaction is taking place in real time
and is quite rapid. No details were given concerning the chemical
composition of the silver-ion solution
I have placed just such a coin into two separate batches of
LVDC CS and I see absolutely nothing happening in the short term (5
minutes or so). Both of these samples are a couple of weeks old so
I will be brewing a new batch shortly to test further.
Thanks for the "jumpstart", Ivan!
*** It's now been about 10 minutes and the penny shows
absolutely no sign of a chemical reaction. The bright shiny parts
of the coin are unchanged... ***
FYI the coin is dated 1945 and consists of 95% copper and 5%
tin/zinc. In 1962 the tin was removed leaving 95% copper and 5%
zinc and in 1982 the composition was changed to 97.5% zinc and 2.5%
copper (i.e. copper plated zinc).
Regards,
George Martin
On Sun, 18 Jun 2000 01:03:30 +1200, Ivan Anderson wrote:
=>May have mentioned this before...
=>Silver ions will be exchanged for aluminium ions eating holes in
and
=>plating out on aluminium foil.
=>
=>The same occurs with copper, and indeed there exist copper test
strips
=>for use in high concentration silver solutions.
=>
=>Ivan.
=>
=>
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