Homebrew PCBs

you would likely get chlorine gas and more water if I remember my first year
chemistry from engineering at all.

On Sat, Feb 26, 2011 at 3:50 PM, Randy S. <rj3819@...> wrote:

>
>
> 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@yahoo.com>
> To: Homebrew_PCBs@yahoogroups.com
> Sent: 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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>
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>
>  
>


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