A potentiometric titration of a 0.278 g sample of FeSO4.7H₂O salt, in acidic medium, with a 0.011 M solution of potassium dichromate (K,Cr:O) was conducted. Cr₂0 + 6 Fe + 14 H → 2Cr + 6 Fe" + 7 H₂O The potential is measured with respect to a calomel electrode (E-246 mV). Graph 1 represents the measured potential with respect to the volume of added dichromate. Calculate E for the half-reaction: Fe + e-Fe (Show your work using Nernst equation). Hint: Use the graph, to determine, approximately, the equivalence point and mid-point of the titration

A potentiometric titration of a 0.278 g sample of FeSO4.7H₂O salt, in acidic medium, with a 0.011 M solution of potassium dichromate (K,Cr:O) was conducted. Cr₂0 + 6 Fe + 14 H → 2Cr + 6 Fe" + 7 H₂O The potential is measured with respect to a calomel electrode (E-246 mV). Graph 1 represents the measured potential with respect to the volume of added dichromate. Calculate E for the half-reaction: Fe + e-Fe (Show your work using Nernst equation). Hint: Use the graph, to determine, approximately, the equivalence point and mid-point of the titration

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Question

A potentiometric titration of a 0.278 g sample of FeSO4.7H,O salt, in acidic medium, with
a 0.011 M solution of potassium dichromate (K.Cr₂O) was conducted.
Cr₂0 + 6 Fe + 14 H →2Cr + 6 Fe" + 7 H₂O
The potential is measured with respect to a calomel electrode (E246 mV). Graph 1
represents the measured potential with respect to the volume of added dichromate.
Calculate E for the half-reaction: Fe + e-Fe (Show your work using Nernst
equation). Hint: Use the graph, to determine, approximately, the equivalence point and
mid-point of the titration
700
675
650
625
600
575
550
525
500
475
450
425
400
18 20
22
10 12 14 16
V (K₂Cr₂O7) in mL
E (MV)
6 8

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