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1. A sample containing magnetite, Fe;O4, was analyzed by dissolving a 1.5419-g sample in concentrated HCI, giving a mixture of Fe2# and Fe³+. After adding HNO3 to oxidize any Fe2+ to Fet, the resulting solution was diluted with water and the Fe+ precipitated as Fe(OH)3 by adding NH3. After filtering and rinsing, the residue was ignited, resulting to 0.8525 g of pure Fe2O3. Calculate the: a) % (w/w) Fe b) % (w/w) Fe;O4 in the sample.

1. A sample containing magnetite, Fe;O4, was analyzed by dissolving a 1.5419-g sample in concentrated HCI, giving a mixture of Fe2# and Fe³+. After adding HNO3 to oxidize any Fe2+ to Fet, the resulting solution was diluted with water and the Fe+ precipitated as Fe(OH)3 by adding NH3. After filtering and rinsing, the residue was ignited, resulting to 0.8525 g of pure Fe2O3. Calculate the: a) % (w/w) Fe b) % (w/w) Fe;O4 in the sample.

Chemistry & Chemical Reactivity
Chemistry & Chemical Reactivity
9th Edition
ISBN:9781133949640
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter22: The Chemistry Of The Transistion Elements
Section22.6: Colors Of Coordination Compounds
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1. A sample containing magnetite, Fe;O4, was analyzed by dissolving a 1.5419-g sample in concentrated HCI, giving a mixture of Fe2+ and Fe³+. After adding HNO3 to oxidize any Fe2+ to Fet, the resulting solution was diluted with water and the Fe+ precipitated as Fe(OH)3 by adding NH3. After filtering and rinsing, the residue was ignited, resulting to 0.8525 g of pure Fe2O3. Calculate the: a) % (w/w) Fe b) % (w/w) Fe;O4 in the sample.
Transcribed Image Text:1. A sample containing magnetite, Fe;O4, was analyzed by dissolving a 1.5419-g sample in concentrated HCI, giving a mixture of Fe2+ and Fe³+. After adding HNO3 to oxidize any Fe2+ to Fet, the resulting solution was diluted with water and the Fe+ precipitated as Fe(OH)3 by adding NH3. After filtering and rinsing, the residue was ignited, resulting to 0.8525 g of pure Fe2O3. Calculate the: a) % (w/w) Fe b) % (w/w) Fe;O4 in the sample.
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