Description of experiment
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Needed compounds:
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sodium sulfite : Na2SO3
sulphuric acid : H2SO4
vanadium pentoxide : V2O5
Class:
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elem=V
redox
acid/base
Summary:
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Vanadium pentoxide hardly dissolves in water. In acid it dissolves slightly
better, but even then its solubility is small.
Description:
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Add some solid V2O5 to water and heat until boiling: The liquid turns pale
yellow and becomes slightly turbid. This turbidity does not disappear within
a few minutes.
Add some sulfuric acid (appr. 15% by weight): The liquid becomes clear now
and it becomes pale yellow (almost colorless).
Add some excess solid sodium sulfite to the pale yellow liquid: The liquid
becomes light blue. The smell of SO2 is observed.