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Yellow precipitate in mandelin reagent

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Bluelight Crew
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Sep 5, 2010
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I made up some mandelin reagent according to the common recipe 100mg Ammonium metavanadate : 10mL c. sulfuric acid

Within a week it had precipitated a bright yellow solid (vanadium (V) oxide?). I presume that's not supposed to happen, can anyone suggest what went wrong?
 
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