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In the Oxidation States of Vanadium: The Beauty of Chemistry—ChemTopic™ Lab Activity, a yellow solution containing vanadium(V) ions goes through a series of beautiful color changes as it is swirled and shaken with zinc metal. The final purple solution of vanadium(II) ions miraculously cycles back through the entire series of color changes when hydrogen peroxide is added. Available as part of the Oxidation and Reduction—ChemTopic™ Labs digital collection. Click the Price link for digital collection pricing.