Standard half-reactions are given below: and

CHEMISTRY · Single correct · A Level · Chemistry · Electrode potentials · Electrode potentials

Problem

Standard half-reactions are given below:

\text{Ag}^++e^-\rightarrow\text{Ag}\quad E^\circ=+0.80\,\text{V}

and

\text{Fe}^{2+}+2e^-\rightarrow\text{Fe}\quad E^\circ=-0.44\,\text{V}

. A galvanic cell is assembled using

\text{Ag}^+/\text{Ag}

and

\text{Fe}^{2+}/\text{Fe}

half-cells, each at

1\,\text{M}

concentration. Which statement correctly identifies the electrodes and electron flow? (a) The iron electrode is the anode, the silver electrode is the cathode, and electrons flow from silver to iron through the external circuit. (b) No spontaneous reaction occurs; therefore, no electrons flow between the iron and silver half-cells. (c) The iron electrode is the anode, the silver electrode is the cathode, and electrons flow from iron to silver through the external circuit. (d) The iron electrode is the cathode, the silver electrode is the anode, and electrons flow from silver to iron through the external circuit.

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