[TheForge] Making Ferric Chloride etchant

[Bruce Freeman]

Bill,
Why do you think that it is the ferrous ion, not the ferric ion formed?  The solution is red, which suggests ferric.
Bruce

>>> newky2 at dejazzd.com 11/21/2006 7:27:40 PM >>>
Bruce,

HCl plus Fe results in Ferrous Chloride (FeCl2) not Ferric Chloride (FeCl3)

I assume that when it will dissolve no more Iron it isn't very useful to
etch iron...

Although it appears you can turn Ferrous Chloride into Ferric Chloride by
adding Chlorine:

FeCl2(aq) + Cl2(g) * FeCl3(aq)





Bill

Sources:

http://en.wikipedia.org/wiki/Iron(III)_chloride 
http://en.wikipedia.org/wiki/Iron(II)_chloride 



-----Original Message-----
From: theforge-bounces at mailman.qth.net [mailto:theforge-bounces at mailman.qth.
net] On Behalf Of Bruce Freeman
Sent: Tuesday, November 21, 2006 1:21 PM
To: theforge at mailman.qth.net 
Subject: [TheForge] Making Ferric Chloride etchant

Buy a jug of muriatic acid.  Add scrap iron.  (Flammable, explosive
hydrogen gas will be given off, so do this outside, using a container
not tightly sealed.)  When acid will dissolve no more iron, the red
solution is Ferric Chloride.

Bruce
NJ

>>> dantull at numail.org 11/21/2006 10:49 AM >>>
I had heard rumors that they were removing it, is why I bought 6
bottles 
last trip in. Last year it was still on the shelf, thou geek didn't
know 
what or where.

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