Re: Products of Iron (II) Sulfate in disolved gold jewlery solution reaction?
photo_at_woelen.nl
Date: 10/27/04
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Date: 27 Oct 2004 12:09:52 -0700
Eric wrote:
<snipped>
I just was thinking on how you could get relatively pure gold from
impure gold, dissolved in aqua regia.
Your problem is that after the gold is dissolved you still have a very
large excess of aqua regia. Any reducing agent, you use for reducing
the gold (III) to metallic gold, results in net reduction of aqua regia
and any gold precipitated will only remain so for a short while.
If you make the solution less acidic with some alkali (e.g. NaOH, be
careful, violent reaction producing a LOT of heat!), then the oxidizing
power of the nitrate ions is strongly reduced. The solution, however,
should remain somewhat acidic, otherwise you precipitate copper and
possibly other impurity-metals, together with the gold. Adding a
reductor then may result in precipitation of the gold, without quick
re-oxidation, while the other impurity-matals remain in solution.
Hopefully another professional chemist will answer to this thread and
might have better ideas (I'm only a hobby chemist and right now I'm
just thinking what you could do, but I do not have hands-on experience
with this). May I suggest you to google words like: gold refining aqua
regia?
Wilco
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