Information for Questions 8 -9: A concentration cell is set up with two different Zn (s) / Zn2+ (aq) half-cells that contain different concentrations of Zn2+ (aq). The two half-cell solutions are connected with a salt bridge, and the zinc electrodes are connected with a wire and voltmeter. Consider the following standard reduction potential at 25°C: Zn2+ (aq) -0.76 V 2e– Zn (s) E_= + Use the information here about this concentration cell for Questions 8 and 9. 8. What is the standard voltage, E°, of this concentration cell at 25°C? -0.76 V -0.38 V 0 V 0.38 V 0.76 V 9 What serves as the cathode in this concentration cell? The zinc electrode immersed in the more concentrated Zn2+ solution. The zinc electrode immersed in the less concentrated Zn2+ solution. The salt bridge. The voltmeter. The identity of the cathode cannot be determined from the information given.
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