A New Type of Reductor And Its Application to the Determination of Iron And of V
A New Type of Reductor And Its Application to the Determination of Iron And of V
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C. In volume, was added potassium permanganate solution in ex- 16 cess, and the pink color destroyed by boiling. Then 30 c. C. Of concentrated hydrochloric acid (13 M) were added, and the solution evaporated to a syrup ; 10 c. C. Of sulfuric acid (9M) were now added, the solution taken down to dense fumes of sulfur trioxide, cooled, diluted with 50 c. C. Of water and again taken down to dense fumes. Two evaporations are necessary to ensure the formation o tetravalent vanadium, since hydrochlori...c acid reduces vanadate to a mixture of tetravalent and tervalent vanadium. 11 After the second fum- ing, the residue was cooled, treated with 50 c. C. Of water, heat- ed till solution was effected, diluted to 150 to 170 c. C. , cooled to 20 and titrated with 0. 013 M permanganate. This titration gave the vanadium content plus a small color "blank. " The titrated solution was then reduced with hydrogen at 20 until colorless, heated to about 90 for fifteen minutes to ensure complete reduction of ferric ion, then cooled rapidly (fifteen minutes) to 20 ; at this point the reductor was removed and the solution titrated with 0.
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To quickly assess the difficulty of the text, read a short excerpt:
C. In volume, was added potassium permanganate solution in ex- 16 cess, and the pink color destroyed by boiling. Then 30 c. C. Of concentrated hydrochloric acid (13 M) were added, and the solution evaporated to a syrup ; 10 c. C. Of sulfuric acid (9M) were now added, the solution taken down to dense fumes of sulfur trioxide, cooled, diluted with 50 c. C. Of water and again taken down to dense fumes. Two evaporations are necessary to ensure the formation o tetravalent vanadium, since hydrochlori...c acid reduces vanadate to a mixture of tetravalent and tervalent vanadium. 11 After the second fum- ing, the residue was cooled, treated with 50 c. C. Of water, heat- ed till solution was effected, diluted to 150 to 170 c. C. , cooled to 20 and titrated with 0. 013 M permanganate. This titration gave the vanadium content plus a small color "blank. " The titrated solution was then reduced with hydrogen at 20 until colorless, heated to about 90 for fifteen minutes to ensure complete reduction of ferric ion, then cooled rapidly (fifteen minutes) to 20 ; at this point the reductor was removed and the solution titrated with 0.
What to read after A New Type of Reductor And Its Application to the Determination of Iron And of V?
You can find similar books in the "Read Also" column, or choose other free books by James Monroe Hendel to read onlineMoreLess
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