ElectrochemistryHard
Question
If Fe3+ + Y4- ⇋ FeY-; Kf = 1.3 × 1025
Fe2+ + Y4- ⇋ FeY2-; Kf = 2.1 × 1014
and Fe3+ + e- ⇋ Fe2+; E- = + 0.77 V
E- for Y- + e- → FeY2-
Fe2+ + Y4- ⇋ FeY2-; Kf = 2.1 × 1014
and Fe3+ + e- ⇋ Fe2+; E- = + 0.77 V
E- for Y- + e- → FeY2-
Options
A.0.13 V
B.- 0.636 V
C.+0.68 V
D.1.41 V
Solution
For FeY- → FeY2-, the change
Fe3+ + e- → Fe2+
E-Fe3+|FeY2|FeY-
E-Fe|Fe2+ +
log 
= 0.77 +log 
= 0.77 - 0.64 = 0.13V
Fe3+ + e- → Fe2+
E-Fe3+|FeY2|FeY-
E-Fe|Fe2+ +
log = 0.77 +
log = 0.77 - 0.64 = 0.13V Create a free account to view solution
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