Re: Copper and ammonium carbonate

donald haarmann:

Hi'ya Don, nice to see a fellow pyro here.


Well you don't specify which copper carbonate you want

Doesn't really matter, but the higher the copper content the better.


and I don't
know what Ullmans Dictionary is, however, I do have UllmaNN's
Encyclopedia,

That's the one, it must be more than 10 years since i had access to
Ullmann's, damn what a nice set.


Ullmann
(among others) sez to buy the obvious water soluble copper salt (Home
Depot, &c.) and add to it the obvious water soluble carbonate to
produce "light" copper carbonate.

Yup, "light" is part of the problem. Precipitated copper carbonate (or
oxide for that matter) is a messy thing to handle, it is nearly
impossible to filter and takes forever and a day to dry.


NB - The product(s) formed are condition (sol. con./temp) dependent.

Exactly. Without a method that produces a consistent composition it's not
really worth the effort. I was sure I read about copper leaching in
Ullmanns, but it might have been one of the other huge technical shelf-
fillers (we had'em all I think).


Copper in an excess of air disolved in aq. sol. of ammonium carbonate
yeilds something blue perhaps cupric diammino-carbonate (Cu(NH3)2CO3.
(Mellor's opus. 3:275)

I am leeching a batch in ammonia and ammonium carbonate now, and it sure
is a pretty blue. Boiling produces black oxide that seems a lot more
dense than the usual precipitation, so I guess I should be happy with
what I've got.


Mellor devotes 14 pages to copper carbonate. If he only reported what
was know for sure .... 1/2 a page would have done nicely.

That's my impression as well, a lot of maybes. I gave up understanding
the finer points of copper chemistry a long time ago...


--
Erlend Meyer

When I am king you will be first against the wall
.

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