Question
A hypothetical electrochemical cell is shown below
A- | A+ (xM)|| B+ (yM)|B+
The emf measured is +0.20 V. The cell reaction is:
-
A+ + B → A + B+
-
A+ + e- → A ; B+ + e- → B-
-
the cell reaction cannot be predicted
-
A+ + B → A+ + B
Solution
D.
A+ + B → A+ + B
Electrochemical cell
A0 | A+ (xM) ||B+ yM) B+
The emf of cell is +.20 V. so cell reaction is possible. The half cell reaction are given as follows:
(i) At negative pole:
A → A+ + e- (oxidation)
(ii) At positive pole:
B+ + e- → B (reduction)
Hence, Cell reaction is
A +B- → A+ + B-, Ecello = + 0.20 V
A +B- → A+ + B-, Ecello = + 0.20 V
