21. Balance the following equations using half-reaction method:a. As + HNO3 -> H3ASO4 + NO2 in acidic conditionsb. Na3CrO3+PbO2+NAOH -> Na2CrO4+Na2PbO2+H2O in basic conditions

The oxidation number on As atom and nitrogen atom in HNO3 are 0 and +5 respectively. Also, the…

Answered: 21. Balance the following equations…

Chemistry: Principles and Reactions

8th Edition

ISBN:9781305079373

Author:William L. Masterton, Cecile N. Hurley

Publisher:William L. Masterton, Cecile N. Hurley

Chapter20: Chemistry Of The Metals

Section: Chapter Questions

Problem 26QAP

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(a) What is the percentage of MnO2 in a pyrolusite ore if a sample weighing 0.4000g is treated with 0.6000g of pure H2C2O4•2H2O and dilute H2SO4 and after reduction has taken place (MnO2 + H2C2O4 + 2H+→ Mn2++ 2CO2 + 2H2O), the excess oxalic acid requires 26.26ml of 0.1000N KMnO4 for titration? (b) If pure As2O3 were used instead of oxalic acid, how many grams would be required in order for the other numerical data to remain the same?
(a) What is the percentage of MnO2 in a pyrolusite ore if a sample weighing 0.4000 g is treated with a 0.6000 g of pure H2C2O4.2H20 and dilute H2SO4 and after reduction has taken place (MnO2 + H2C2O4 + 2H+ Mn2+ + 2CO2 + 2H2O), the excess oxalic acid requires 26.26 mL of 0.1000 N KMNO4 for titration? (b) If pure As2O3 were used instead of oxalic acid, how many grams would be required in order for the other numerical data to remain the same?
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21. Balance the following equations using half-reaction method: a. As + HNO3 -> H3ASO4 + NO2 in acidic conditions b. Na3CrO3+PbO2+NAOH -> Na2CrO4+Na2PbO2+H2O in basic conditions