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Aqua Regia from Potassium Nitrate and hcl


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Make a very fine powder of the KNO3 and add that to the acid and heat a little bit. Part of it will dissolve and your white solid, which does not dissolve is not only KNO3, it also is KCl.


This mechanism works somewhat better with NaNO3. NaCl is really insoluble in conc. HCl and if the NaNO3 is very finely powdered, then most of the nitrate ions is replaced by chloride ions in the solid, but also here, part of the nitrate does not go into solution.

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