Homework Help is Here – Start Your Trial Now!
Science
Chemistry
The amount of Fe in a 0.4891-g sample of an ore was determined by a redox titration with K2Cr,0,. All the Fe was initially converted to Fe2+ followed by titration with 0.02153 M K,Cr207, which required 36.92 mL. The titration reaction is: Cr,0,2- + 6Fe?+ + 14H* - 20r+ + 6FE3+ + 7H20 How many millimoles of Fe2+ is present in the sample? a) 4.769 mmol b) 2.385 mmol c) 1.590 mmol d) 0.3974 mmol e) 0.1325 mmol If Fe in the sample exists as Fe203 (159.69 g/mol), what is the percentage by weight Fe2O3? a) 25.97% b) 38.93% c) 52.91% d) 76.45% e) 77.86% Based on the titration reaction, which of the following statements is TRUE? a) The species oxidized is Cr20,2-. b) The oxidation number of iron decreased. c) Chromium (VI) is converted to chromium (III). d) The reaction occurs under neutral conditions. e) None of the above.

The amount of Fe in a 0.4891-g sample of an ore was determined by a redox titration with K2Cr,0,. All the Fe was initially converted to Fe2+ followed by titration with 0.02153 M K,Cr207, which required 36.92 mL. The titration reaction is: Cr,0,2- + 6Fe?+ + 14H* - 20r+ + 6FE3+ + 7H20 How many millimoles of Fe2+ is present in the sample? a) 4.769 mmol b) 2.385 mmol c) 1.590 mmol d) 0.3974 mmol e) 0.1325 mmol If Fe in the sample exists as Fe203 (159.69 g/mol), what is the percentage by weight Fe2O3? a) 25.97% b) 38.93% c) 52.91% d) 76.45% e) 77.86% Based on the titration reaction, which of the following statements is TRUE? a) The species oxidized is Cr20,2-. b) The oxidation number of iron decreased. c) Chromium (VI) is converted to chromium (III). d) The reaction occurs under neutral conditions. e) None of the above.

Chemistry by OpenStax (2015-05-04)
Chemistry by OpenStax (2015-05-04)
1st Edition
ISBN:9781938168390
Author:Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser
Publisher:Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser
Chapter19: Transition Metals And Coordination Chemistry
Section: Chapter Questions
Problem 11E: Iron (II) can be oxidized to iron (III) by dichromate ion, which is reduced to chromium (III) in...
See similar textbooks
icon
Related questions
Question
The amount of Fe in a 0.4891-g sample of an ore was determined by a redox titration with K,Cr,07. All the Fe was initially converted to Fe2* followed by titration with 0.02153 M K,Cr207, which required 36.92 mL. The titration reaction is: Cr,0, + 6FE2* + 14H* → 2Cr*+ + 6Fe* + 7H2O How many millimoles of Fe2+ is present in the sample? a) 4.769 mmol b) 2.385 mmol c) 1.590 mmol d) 0.3974 mmol e) 0.1325 mmol If Fe in the sample exists as Fe,O3 (159.69 g/mol), what is the percentage by weight Fe,O3? a) 25.97% b) 38.93% c) 52.91% d) 76.45% e) 77.86% Based on the titration reaction, which of the following statements is TRUE? a) The species oxidized is Cr20,2-. b) The oxidation number of iron decreased. c) Chromium (VI) is converted to chromium (III). d) The reaction occurs under neutral conditions. e) None of the above.
Transcribed Image Text:The amount of Fe in a 0.4891-g sample of an ore was determined by a redox titration with K,Cr,07. All the Fe was initially converted to Fe2* followed by titration with 0.02153 M K,Cr207, which required 36.92 mL. The titration reaction is: Cr,0, + 6FE2* + 14H* → 2Cr*+ + 6Fe* + 7H2O How many millimoles of Fe2+ is present in the sample? a) 4.769 mmol b) 2.385 mmol c) 1.590 mmol d) 0.3974 mmol e) 0.1325 mmol If Fe in the sample exists as Fe,O3 (159.69 g/mol), what is the percentage by weight Fe,O3? a) 25.97% b) 38.93% c) 52.91% d) 76.45% e) 77.86% Based on the titration reaction, which of the following statements is TRUE? a) The species oxidized is Cr20,2-. b) The oxidation number of iron decreased. c) Chromium (VI) is converted to chromium (III). d) The reaction occurs under neutral conditions. e) None of the above.
Expert Solution
steps

Step by step

Solved in 3 steps with 3 images

SEE SOLUTIONCheck out a sample Q&A here
Blurred answer
Knowledge Booster
Redox Titrations
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, chemistry and related others by exploring similar questions and additional content below.
Similar questions
Recommended textbooks for you
Chemistry by OpenStax (2015-05-04)
Chemistry by OpenStax (2015-05-04)
Chemistry
ISBN:
9781938168390
Author:
Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser
Publisher:
OpenStax
General Chemistry - Standalone book (MindTap Cour…
General Chemistry - Standalone book (MindTap Cour…
Chemistry
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:
Cengage Learning
Chemistry & Chemical Reactivity
Chemistry & Chemical Reactivity
Chemistry
ISBN:
9781133949640
Author:
John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:
Cengage Learning
Chemistry & Chemical Reactivity
Chemistry & Chemical Reactivity
Chemistry
ISBN:
9781337399074
Author:
John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:
Cengage Learning
Chemistry
Chemistry
Chemistry
ISBN:
9781305957404
Author:
Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:
Cengage Learning
SEE MORE TEXTBOOKS