Description of experiment
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Needed compounds:
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hydrochloric acid : HCl
nitric acid : HNO3
Class:
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elem=N,Cl
redox
Summary:
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When nitric acid is mixed with hydrochloric acid, then so called aqua regia
is obtained. This is a colorless liquid, which, however, is not very stable
and which decomposes. What are the decomposition products?
Description:
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Mix some HNO3 (at least 50% by weight) with HCl (appr. 30% by weight): The
resulting liquid is colorless.
Heat the liquid: The liquid first becomes green, after a while it becomes
yellow/brown. Above the liquid a yellow/brown gas (mixture?) is formed. There
is some effervescence, as long as the liquid is hot. The gas is no Cl2 (color),
but its smell is like that of chlorine, hence the gas also is no NO2. It may
be a mixture, containing chlorine (explaining its smell) and NO2 (explaining
its color), but it may also be another colored gas.