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b. What is the % w/w Fe3O4 in the sample? O 10.33% O 32.58% O 23.24% O 48.86% O 21.72%

b. What is the % w/w Fe3O4 in the sample? O 10.33% O 32.58% O 23.24% O 48.86% O 21.72%

General Chemistry - Standalone book (MindTap Course List)
General Chemistry - Standalone book (MindTap Course List)
11th Edition
ISBN:9781305580343
Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Publisher:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Chapter19: Electrochemistry
Section: Chapter Questions
Problem 19.66QP: Answer the following questions by referring to standard electrode potentials at 25C. a Will oxygen,...
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10b

10. An ore containing magnetite, Fe304, was analyzed by dissolving a 0.9859-g sample in concentrated HCI, giving a mixture of Fe2+ and Fe3+. After adding HNO3 to oxidize any Fe2* to Fe3+, the resulting solution was diluted with water and the Fe3+ precipitated as Fe(OH)3 by adding NH3. After filtering and rinsing, the residue was ignited, giving 0.2215 g of pure Fe203. (MM of Fe203 = 159.69 g/mol, MM of Fe304 = 231.533 g/mol)
Transcribed Image Text:10. An ore containing magnetite, Fe304, was analyzed by dissolving a 0.9859-g sample in concentrated HCI, giving a mixture of Fe2+ and Fe3+. After adding HNO3 to oxidize any Fe2* to Fe3+, the resulting solution was diluted with water and the Fe3+ precipitated as Fe(OH)3 by adding NH3. After filtering and rinsing, the residue was ignited, giving 0.2215 g of pure Fe203. (MM of Fe203 = 159.69 g/mol, MM of Fe304 = 231.533 g/mol)
b. What is the % w/w Fe304 in the sample? O 10.33% O 32.58% O 23.24% 48.86% O 21.72%
Transcribed Image Text:b. What is the % w/w Fe304 in the sample? O 10.33% O 32.58% O 23.24% 48.86% O 21.72%
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