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    Percent manganese in a sample

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    A 0.500g sample is analyzed spectrophotometrically for manganese by dissolving it in acid and transferring to a 250mL flask and diluting to volume. Three aliquots are analyzed by transforming 50mL portions with a pipet to 500mL Erlenmeyer flasks and reacting with an oxidizing agent, potassium peroxydisulfate, to convert the manganese to permanganate. After reaction, they are quantitatively transferred to 250 mL volumetric flasks, diluted to volume, and measured spectrophotometrically. By comparison to standards, the average concentration in the final solution is determined to be 1.25 x 10^-5M. What is the percent manganese in the sample?

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