Description of experiment
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Needed compounds:
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potassium ferrocyanide : K4 [Fe(CN)6] . 3H2O
sodium hydroxide : NaOH
vanadyl sulfate : VOSO4.5H2O
Class:
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elem=V,Fe
precipitation
Summary:
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The vanadyl salt of ferrocyanide does not dissolve in water. The salt is
easily hydrolysed in alkaline environments (it resembles the prussian blue
as far as this behaviour is concerned).
Description:
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Add an excess amount of a solution of potassium ferrocyanide to a slightly
acidic solution of vanadyl sulfate: Formation of a yellow/green - yellow/
brown precipitate. The precipitate consists of a few large lumps, sponge-
like in appearance.
Add some solid NaOH: The solid dissolves and the precipitate dissolves.
The liquid becomes clear. The final color of the liquid is red/brown.