Potentiometric titration A potentiometric titration of a 0.278 g sample of FeSO.7H,0 salt, in acidic medium, with a 0.011 M solution of potassium dichromate (K.Cr.0) was conducted. The potential is measured with respect to a calomel electrode (Edmat - 246 mV). The following graph represents the measured potential with respect to the volume of added dichromate. 700 675 650 Calculate E" for the half- reaction: Fe"+ e Fe (Show your work using Nernst equation). 625 600 575 550 Hint: Use the graph, to determine, approximately, the equivalence point and mid-point of the titration 525 500 475 450 425 400 (Am) 3
Potentiometric titration A potentiometric titration of a 0.278 g sample of FeSO.7H,0 salt, in acidic medium, with a 0.011 M solution of potassium dichromate (K.Cr.0) was conducted. The potential is measured with respect to a calomel electrode (Edmat - 246 mV). The following graph represents the measured potential with respect to the volume of added dichromate. 700 675 650 Calculate E" for the half- reaction: Fe"+ e Fe (Show your work using Nernst equation). 625 600 575 550 Hint: Use the graph, to determine, approximately, the equivalence point and mid-point of the titration 525 500 475 450 425 400 (Am) 3
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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Transcribed Image Text:Potentiometric titration
A potentiometric titration of a 0.278 g sample of FeSO.7H,0 salt, in acidic
medium, with a 0.011 M solution of potassium dichromate (K.Cr.0-) was
conducted.
The potential is measured with respect to a calomel electrode (Eadnd = 246 mV).
The following graph represents the measured potential with respect to the volume
of added dichromate.
700-
675
650
Calculate E for the half-
625
reaction: Fe" + e Fe
(Show your work using
Nemst equation).
600
> 575
550
Hint: Use the graph, to
determine, appraximately,
the equivalence point and
mid-point of the titration
525
500
475
450
425
400
6
8
10
12
14
16
18
20 22
V (K>Cry0,) in ml.
(Au) 3
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