![]() Nitric acid undergo decomposition in acidic chloride enviroment, producing mainly nitrosyl chloride and chlorine. redox potential required to dissolve the gold back to the solution. Remains of nitric acid are still present, but it does have much with redox potential of liquid vs. There is practically always some minor loss, but it could be recovered from washes.Ĭlick to expand.It is a bit more complicated. You will always lost some values, mainly in washing steps of the gold powder with acid. Or you can cement the metal with more reactive metal (gold with copper etc.). Most efficient way how to precipitate metal in quantitative way is make inslouble compound, which could be filtered (like AgCl). Which will reduce not only gold, but also other junk from the solution. ![]() Very nasty, unforgiving, toxic and explosive stuff. I work my life hand in hand hydrazine, because I am in organic chemistry and use it a lot as building block. Which could in the end contaminate your gold.īe aware of hydrazine. Simply said, you produce (alongside the product) lots of unwanted sideproducts. This reaction has very low "atom economy", as it is named these days. So for one auric ion, you need 3 ferrous sulfate molecules. If we take it more analytically, iron (II) oxidation is one electron process. ![]() So when dropping gold, you inevitably introduce a lot of iron to the solution. Also easy to tell when you added enough.įerrous sulfate has an disadvantage - it contain iron. Practically non-toxic, cheap and very effective.
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