Description of experiment
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Needed compounds:
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anhydrous chromic acid : CrO3
phosphorus pentachloride : PCl5
Class:
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elem=P,Cl,Cr
acid/base
Summary:
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When phosphorus pentachloride is added to chromium trioxide, then a fairly
vigorous reaction occurs and exchange of oxygen and chlorine atoms occurs. The
two solids react with each other, forming liquid CrO2Cl2 and liquid POCl3.
Description:
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Add a spatula full of PCl5 to a spatula full of CrO3: The mix starts fizzling
and red/brown vapors of CrO2Cl2 are formed. The solid mass liquefies. Some heat
is produced, but the reaction is not extremely exothermic.
After a while, the entire test tube is filled with the orange/brown vapor of
CrO2Cl2. When the test tube is opened, strong fumes can be observed.