AP Chemistry
9.9 Cell Potential and Free Energy
9.8 Galvanic (Voltaic) and Electrolytic Cells
A standard galvanic cell is constructed using two half-cells connected by a salt bridge and an external wire with a voltmeter at \(298\text{ K}\). The standard reduction potentials for the two half-reactions are given below.
\[\text{Fe}^{2+}\text{(aq)} + 2\,\text{e}^- \rightarrow \text{Fe(s)} \quad E^\circ = -0.44\text{ V}\]
\[\text{Ag}^+\text{(aq)} + \text{e}^- \rightarrow \text{Ag(s)} \quad E^\circ = +0.80\text{ V}\]
Which of the following correctly identifies the direction of electron flow through the external wire and the standard cell potential, \(E^\circ_{\text{cell}}\), when the cell operates spontaneously?
\[\text{Fe}^{2+}\text{(aq)} + 2\,\text{e}^- \rightarrow \text{Fe(s)} \quad E^\circ = -0.44\text{ V}\]
\[\text{Ag}^+\text{(aq)} + \text{e}^- \rightarrow \text{Ag(s)} \quad E^\circ = +0.80\text{ V}\]
Which of the following correctly identifies the direction of electron flow through the external wire and the standard cell potential, \(E^\circ_{\text{cell}}\), when the cell operates spontaneously?
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