Question

A hypothetical electrochemical cell is shown above. The emf of the cell is +0.20V. Thus, the cell reaction can be given as:

• A. A${}^{+}$ + B $\to$ A + B${}^{+}$
• B. A${}^{+}$ + e $\to$ A ; B${}^{+}$ + e $\to$ B
• C. the cell reaction cannot be predicted
• D. A + B${}^{+}$ $\to$ A${}^{+}$ + B

Answer 1

Answer: (D)

A + B${}^{+}$ $\to$ A${}^{+}$ + B

$A|A^{+}\left(xM\right)\parallel B^{+}\left(yM\right)|B$

increases in oxidation state at anode

(oxidation)

$A⟶A^{+}+e^{-}$ (at anode)

$B^{+}+e⟶B$ (at cathode)

$A+B^{+}⟶A^{+}+B$ $E=0.20V$