[NewCandle] Cobalt versus iron hydroxides

[Nick Reiter]

Hi Keith,

OK, dang it, I have to toss in the towel on your
separation of Co and Fe hydroxides problem, with nary
but a vague suggestion.

The solubility and reactivity of the two - from
everthing I can glean from the CRC manual is damned
near identical.  The even weigh nearly the same, so
there goes any easy centrifuging.

I had a devil of a time finding specific magnetic
susceptibilities for those two compounds, however in
general it looks like Fe oxides and sulphides are a
little more paramagnetic than corresponding cobalt
compounds.  They are also a different color - FeOH2
being supposedly a pale green color, and CoOH2 being a
reddish color.  So maybe with a strong magnet, a lot
of shaking, and a keen eye for color, you might be
able to pull it off.

I thought that maybe one might have a higher
decomposition temperature than the other, but I
couldn't find any data for that.

Sorry I drew such a blank!  Anyone else come up with
any ideas?

NR


 
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