Wow .. its fun updating my own posts .. lol
I guess I have to be careful what I wish for .
( I knew I should have taken chemistry comment )
I went to you tube and found 35 berkeley lectures
50 minutes each on chemsitry 1A , which I would assume is
like Chem 101 .. ;)
Now the question is, can you teach an old dog , new chemistry LOL
Is everyone suffering from friday nite hangovers?
Randy - N2CUA
________________________________
From: Randy S. <
rj3819@...>
To:
Homebrew_PCBs@yahoogroups.comSent: Sat, February 26, 2011 4:35:31 PM
Subject: Re: [Homebrew_PCBs] Question for the chemistry majors !!
hmmm no replies yet ..
I did find this though ..
∗ If the concentration of a particular ion is high, it will be selected to be
discharged even though it is higher in the electrochemical series compares with
another ion present in the solution.
∗ For example, if dilute hydrochloric acid is electrolysed, hydrogen gas is
given off at the cathode and oxygen gas at the anode.
∗ However, when concentrated hydrochloric acid is electrolysed, hydrogen gas is
still given off at the cathode, but chlorine rather than oxygen gas will be
released at the anode, even though chloride is in a higher position in
electrochemical series
∗
I knew I should have taken chemistry LOL
Randy
________________________________
From: Randy S. <
rj3819@...>
To: Homebrew_PCB <
homebrew_pcbs@yahoogroups.com>
Sent: Sat, February 26, 2011 12:52:10 PM
Subject: [Homebrew_PCBs] Question for the chemistry majors !!
I'm not talking about Chemistry.com here either ..lol
Ok .. using muriatic acid .. with the hydrochloric acid in it mixed with
peroxide.
I looked a chemelec's website where he uses sulfuric acid and electrodes
to remove over 90% of the copper, then finishes the board off in ferric
chloride.
So .. I thought if should work with other acids ..
I put a electrode in on the negative lead and a scrape piece of board on the
positive lead, started cranking up the voltage .. and it did indeed start
drawing
current and bubbling .. no ventilation so I shut it off right away ..
The questions are :
He mentioned gases from the electro-etch process, which makes sense as
there are bubbles .. which are toxic .. I assume the gases from his acid would
be different then the gases from mine. Chemistry majors ?? What is the gas
being released from my H2O2 and HCL LOL
Some kind of a hydrogen chloride gas ?? sounds toxic and flammable .. lol
I was thinking I would make a setup to use my solution, aearate the tank and
use some electro-etching, if that what it is , to help the process along ...
Sound ok ? Would there be problems with that ?
thanks all
Randy - N2CUA
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