Description of experiment
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Needed compounds:
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sodium persulfate : Na2S2O8
sulphuric acid : H2SO4
vanadyl sulfate : VOSO4.5H2O
Class:
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elem=V
redox
Summary:
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Peroxodisulfate ([S2O8]2-) is capable of oxidizing vanadyl ([VO]2+) to
pervanadyl ([VO2]+), but this reaction proceeds slowly.
Description:
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Add an excess amount of Na2S2O8 to an acidified solution of vanadyl sulfate
(acidified with some sulfuric acid): The liquid remains blue. After a few
hours the liquid has turned apple-green. One day later the liquid has turned
yellow.