shadybear
Well-known member
I read somewhere that you could use zinc
to precepitate gold out of Aqua Regis.
Do you put in the urea first?
to precepitate gold out of Aqua Regis.
Do you put in the urea first?
How does zinc work!
- Thread starter shadybear
- Start date
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Yes, you should kill the excess nitric acid with urea first. Zinc works because it is higher in the Activity Series than gold. It's also higher in activity than several other metals which it will knock out of the AR solution if they are present. This can contaminate your gold.
Noxx
Well-known member
Zinc will take the place of your gold (and other metals) in your solution. This will make it drop. 
