3+H₁PO₁₂+ Cr₂O H₂PO + Cr³ + Oxidation balancing→сH3PO2 + Cr2O72-->H3PO4 + Cr3+

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Chemistry: Principles and Reactions

8th Edition

ISBN:9781305079373

Author:William L. Masterton, Cecile N. Hurley

Publisher:William L. Masterton, Cecile N. Hurley

Chapter4: Reactions In Aqueous Solution

Section: Chapter Questions

Problem 58QAP: The iron content of hemoglobin is determined by destroying the hemoglobin molecule and producing...

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A 5.00 mL sample of brandy was diluted to 1.00 L in a volumetricflask. The ethanol in 25.00 mL aliquot of the diluted solution wasdistilled into 50.0 mL of 0.02000 M K2Cr2O7and oxidized to aceticacid with heating.3C2H5OH + 2Cr2O72- + 16 H+ → 4 Cr3+ + 3CH3COOH + 11 H2OAfter cooling, 20.00 mL of 0.1253 M Fe3+ was pipetted into the flask. The excess Fe2+ was then titrated with 7.46 mL of standard K2Cr2O7to a diphenylamine sulfonic acid endpoint. Calculate the percent (w/v) ethanol (MW 46.07 g/mol) in the brandy.
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3+ H₁PO₁₂+ Cr₂O H₂PO + Cr³ + Oxidation balancing → с H3PO2 + Cr2O72- -> H3PO4 + Cr3+