Question

Which statement(s) is/are not correct when the silver and vanadium half-cells are connected via a salt bridge and a potentiometer to form a galvanic cell?

Ag+ + 1e- -> Ag (s) E° = 0.7993V
V2+ + 2e- -> V(s) E° = -1.125V
Ag+ is reduced
V2+ is oxidized
E°cell = 1.924V
Ag is oxidized
A) I and II
B) III, IV, and V
C) I and III
D) III only
E) IV and V

Answer 1

The correct statements when the silver and vanadium half-cells are connected via a salt bridge and a potentiometer to form a galvanic cell are the reduction of Ag+ and the oxidation of Ag. The incorrect statements are the oxidation of V2+ and the reduction of V.

Step-by-step explanation:

The correct statement(s) when the silver and vanadium half-cells are connected via a salt bridge and a potentiometer to form a galvanic cell are:

I. Ag+ is reduced

III. Ag is oxidized

The statements that are not correct are II, IV, and V. The half-reaction V2+ + 2e- → V(s) with the reduction potential E° = -1.125V is incorrect. It should be V(s) → V2+ + 2e-. Therefore, the correct answer is B) III, IV, and V.

Answer 2

The incorrect statements regarding the galvanic cell made of silver and vanadium half-cells are that Ag (silver) is oxidized. Ag is actually reduced, and the calculation of the overall cell potential E°cell is correct.

Step-by-step explanation:

When considering the statements given about a galvanic cell made of silver and vanadium half-cells, there are a couple of inaccuracies. First, given that the silver half-cell has a standard reduction potential (E°) of 0.7993V, silver (Ag) is indeed reduced in the cell. Second, since the standard reduction potential of the vanadium half-cell is -1.125V, vanadium (V) is oxidized. The cell potential (E°cell) is correctly calculated as the difference in reduction potentials of the cathode and anode, which in this case would be E°cell = E°cathode - E°anode = 0.7993V - (-1.125V) = 1.9243V. This calculation is in line with the statement that E°cell = 1.924V. Lastly, since the Ag+ is reduced to Ag, it is not correct that Ag is oxidized. Therefore, statements that are not correct are: Ag is oxidized.