AP Chemistry
9.10 Cell Potential Under Nonstandard Conditions
9.9 Cell Potential and Free Energy
9.8 Galvanic (Voltaic) and Electrolytic Cells
A galvanic cell is constructed at \(298\text{ K}\) with a zinc strip immersed in \(1.0\text{ M }\text{Zn(NO}_3)_2\text{(aq)}\) and a copper strip immersed in \(1.0\text{ M }\text{Cu(NO}_3)_2\text{(aq)}\). The overall cell reaction and standard cell potential are shown below.
\[\text{Zn(s)} + \text{Cu}^{2+}\text{(aq)} \rightleftharpoons \text{Zn}^{2+}\text{(aq)} + \text{Cu(s)} \quad E^\circ_{\text{cell}} = +1.10\text{ V}\]
A student adds several drops of concentrated \(\text{Na}_2\text{S(aq)}\) to the anode compartment, which results in the immediate formation of a white precipitate of \(\text{ZnS(s)}\). Which of the following correctly predicts and justifies the effect of this addition on the operational cell potential, \(E_{\text{cell}}\)?
\[\text{Zn(s)} + \text{Cu}^{2+}\text{(aq)} \rightleftharpoons \text{Zn}^{2+}\text{(aq)} + \text{Cu(s)} \quad E^\circ_{\text{cell}} = +1.10\text{ V}\]
A student adds several drops of concentrated \(\text{Na}_2\text{S(aq)}\) to the anode compartment, which results in the immediate formation of a white precipitate of \(\text{ZnS(s)}\). Which of the following correctly predicts and justifies the effect of this addition on the operational cell potential, \(E_{\text{cell}}\)?
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