If gold is dissolved in aqua regia how can you separate it back out?
The method I know of is used in large-scale mining firms, so I'm not too sure that you could do it yourself. The process involves:
1. Removal of nitric acid: Add urea until no more visible reaction (fizzing stops) 2. Precipitation of Gold: Add ferrous sulfate. This causes the gold chloride to "reduce" to gold, yielding a cloudy solution ready for filtering. 3. Filtration: Allow precipitation to occur for as long as possible (1 night here). Siphon and filter gold. Clean and cast.
2.
Not very easily! I don't know of any ways... Presumably you'd want to either use a precipitation reaction or an electrochemical method, but in both cases I don't know of any reagents that wouldn't get destroyed by the aqua regia themselves in the process
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