mramos1 said:
Hayato:
I just picked up the muratic acid (if nothing else wife was some cleaning done) and 4 Dollar store bottles of peroxide.. So the H2O2 must be 30%. Crap hope it is. It is in the garage and I have to run to a soccer game. Will check when back. And it is 1/3 acid poured into 2/3 peroxide right? And do not save it when done?
What is the best way to dispose of it? Take to a reclaim center, or can it be diluted to almost water?
I just want to see how fast it is.
It's very fast, I'd say it takes about 35% of the Ferric Chloridre time. But as Rolf said, the ambient temperature is a decisive factor.
I use less, I pour about 1/4 of peroxide into 3/4 of acid.
You can store it, but it's "power" will decrease due the H2O2 decomposition, if you store in a coke bottle, make sure to "squeese" it a little (to remove some air) before you close it.
So the best thing is just to prepare what you are going to use that moment.
After etching the solution will be some sort of "greenish-blue" due the Cooper Chloride.
Best way to dispose it is neutralizing with baking soda or sodium bicarbonate, after neutralizing you can dispose the same way you dispose ferric chloride.
The greatest problem in those electronics etchants (both FeCl3/ Muriatic Acid solution) is that you have cooper chloride after etching, which is not healthy to humans/nature, but its quantity is very small.
Make sure to etch outside and away from metallic parts, the chlorine gas will oxide metals.
Andy1845c said:
True, but if you have any cuts or scratches, you'll feel it burn like crazy! Don't be stupid like me, wear gloves
Correct me if i'm wrong, but is either one toxic? I would think it can just be diluted or neutralized.
Yes, HCl decomposes the blood instantly. You know, it makes me remember a scene in the university.
The guy was supposed to transfer sulphuric acid from one canister to another, he was given instructions, a glass tube and a vacuum pump to transfer the acid.
Well, he just did not used the vacuum pump (I don't know why), try to guess what he used to make the vacuum... His mouth.
After the acid entered in contact with his mouth it was a horrible thing, his buccal mucosa just smelted and all his teeth fell, there where plenity of blood... He didn't die but...
Hydrogen Peroxid is not that toxic (only if you drink it), it will decompose into H2O + O2.
HCl is toxic and should be neutralized with sodium bicarbonate, so that is forms a non toxic solution (Sodium Bicarbonate + NaCl + H2O).