Description of experiment
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Needed compounds:
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ammonium molybdate : (NH4)6Mo7O24 . 4H2O
phosphoric acid : H3PO4
Class:
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elem=Mo,P
coordination
Summary:
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Phosphates and molybdates are supposed to form a yellow complex. Other
experiments confirm this reaction, but this experiment does not show
such behavior. May be longer heating is required or an excess amount of
a strong acid is required?
Description:
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Add some solid ammonium molybdate to some phosphoric acid (appr. 8% by
weight: The solid dissolves. The liquid remains colorless.
Heat the liquid for a while (a few minutes) and keep at a temperature near
the boiling point of water: No visible changes, the liquid remains clear and
colorless.