Re: Advice for resolving Cu(NO3)2-3H2O issues?


Nobody Important wrote:
I have no experience similiar to your experiments. But I believe the
best way is to contact the authors and intimate them about your
concern. Hydrated copper nitrate seems to be very complex, the water of
hydration being 6, 3 and 2.5, as I checked in one handbook.

As someone else has suggested, titrate a known weight of your copper
nitrate slurry and then calculate the amount of copper "as" copper
nitrate trihydrate. Proceed then with the calculated amounts. This will
give you an idea of the copper nitrate trihydrate content in unit mass.
Ideally it should be equal to hundred percent. Complexometric titration
of copper with EDTA is a one step titration. If you need to do this I
may give a reference.

I wonder, why a nitrate is needed. Is it copper oxide what is finally
required, because the nitrate would readily decomposed to the oxide at
the temperature of your flux? Copper oxide seems to be very neat.


Those titration references would be most appreciated!

An excellent reference, pg 182 and 183 for copper
T.S. West, "Complexometry with EDTA and Related Reagents" 3rd Edition,
BDH 1969.

or check out older editions of Vogel "Quantitative Analysis" 3rd Ed
perhaps, direction titration of copper with EDTA using Fast sulphon
Black-F indicator. This is the one I have tried and shows excellent
results.


The problem with starting with copper oxide is that it tends to
agglomerate, resulting in chunks of barium cuprate encapsulated copper
oxide floating around in the flux. I've had no luck, even after
milling the mix down to .1 microns. That being said, the mix was not
with the nitrate salts. I used copper oxide, barium carbonate, and
yttrium carbonate for that reaction. After pressing and sintering the
pellet 8 times, my advisor decided that it wasn't going anywhere and
told me to try this route...

.

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