As a rule of thumb, transition metal salt such as copper chloride are very toxic. DO NOT pour it down the drain. Neutralize it first with sodium carbonate. Excess HCl reacts with carbonate to form table salt, water and CO2. But the toxic copper chloride is still there.
Evaporate out the water to get copper chloride salt then when you have enough, take it to haz-mat recycling. California hazardous roundup was pretty good. take any "household" toxic material no questions asked. Label it clearly so they know what they got :) The people collecting most likely have no clue when you hand over copper chloride solution. They'll just thank you and take it from your hand. and be sure to add mixture of spent containers like herbicide container (round up), used car oil, old paint, paint thinners...
And be very safe with the stuff. Just because you can make it at home so easily doesn't mean its not that toxic.
smilingcat
--- In Homebrew_PCBs@yahoogroups.com, MIKE DURKIN <Patriot121@...> wrote:
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> It does wondrous things to blood ... fixes the copper in hemoglobin and you suffocate .... don't drink (Duhh ) ... don't splash it on ya ... etc. Be safe ...
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> Mike
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> To: Homebrew_PCBs@yahoogroups.com
> From: smilingcat@...
> Date: Fri, 23 Nov 2012 02:51:25 +0000
> Subject: [Homebrew_PCBs] Re: Ratio of Ferric Chloride to copper?
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> hmmm... can't really go by volume of FeCl3 (Ferric chloride) and volume of copper. Wht you need to know is how many moles of each (chemists way of counting number of atoms or molecules) will react together. read about atomic weight, Copper weighs 29gram/mole whereas FeCl3 weighs 77g/mole.
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> And now you want to know how much ferric chloride can "eat" copper.
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> It takes two molecules of ferric chloride to "eat" one atom of copper and turn it into one molecule of Copper chloride (CuCl2). I think it was...
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> So you need 154g of ferric chloride to etch 29g of copper.
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> You have to know the concentration of your ferric chloride solution.
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> BTW, ferric chloride isn't an acid, its a salt like sodium chloride (table salt).
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> hope this answers your question.
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> --- In Homebrew_PCBs@yahoogroups.com, "RickS" <rgsparber@> wrote:
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> > Does anyone know the ratio of needed Ferric Chloride by volume to the volume of copper being removed? I am assuming 110F for the acid and constant agitation.
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> > Thanks in advance,
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> > Rick Sparber
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