The amount of Fe in a 0.4891-g sample of an ore was determined by a redox titration with K;Cr;0,. All the Fe was initially converted to Fe?* followed by titration with 0.02153 M K¿Cr;O, which required 36.92 ml. The titration reaction is: Cr,0,7 + 6Fe?* + 14H" → 2Cr³" + 6FE³* + 7H;0 Answer the ff: 1. If Fe in the sample exists as Fe,O, (159.69 g/mol), what is the percentage by weight Fe,0,? 2. Based on the titration reaction, which of the following statements below is TRUE? The species oxidized is Cr,0,*. The oxidation number of iron decreased. Chromium(VI) is converted to chromium(I). The reaction occurs under neutral conditions.
The amount of Fe in a 0.4891-g sample of an ore was determined by a redox titration with K;Cr;0,. All the Fe was initially converted to Fe?* followed by titration with 0.02153 M K¿Cr;O, which required 36.92 ml. The titration reaction is: Cr,0,7 + 6Fe?* + 14H" → 2Cr³" + 6FE³* + 7H;0 Answer the ff: 1. If Fe in the sample exists as Fe,O, (159.69 g/mol), what is the percentage by weight Fe,0,? 2. Based on the titration reaction, which of the following statements below is TRUE? The species oxidized is Cr,0,*. The oxidation number of iron decreased. Chromium(VI) is converted to chromium(I). The reaction occurs under neutral conditions.
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...
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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¿Cr20;, which required 36.92
mL. The titration reaction is:
Cr,0,2 + 6Fe?* + 14H* → 2Cr* + 6FE3* + 7H;0
Answer the ff:
1. If Fe in the sample exists as Fe,03 (159.69 g/mol), what is the percentage by
weight Fe,0,?
2. Based on the titration reaction, which of the following statements below is
TRUE?
The species oxidized is Cr.0,*.
The oxidation number of iron decreased.
Chromium(VI) is converted to chromium(II).
The reaction occurs under neutral conditions.
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