An electrochemical cell is set up with the following configuration: Hg|Hg2+||Mn2+|Mn.  The solutions are, respectively, 0.1 M Hg(NO3)2 (aq) and 0.1 M Mn(NO3)2 (aq).  A voltmeter connected between the two electrodes reads -2.16 V.  a.    Write the two half-reactions for the cell as written. b.    The standard reduction potential for Mn2+ + 2e- ® Mn is E° = -1.18 V.

Chemistry & Chemical Reactivity
10th Edition
ISBN:9781337399074
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter19: Principles Of Chemical Reactivity: Electron Transfer Reactions
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An electrochemical cell is set up with the following configuration: Hg|Hg2+||Mn2+|Mn.  The solutions are, respectively, 0.1 M Hg(NO3)2 (aq) and 0.1 M Mn(NO3)2 (aq).  A voltmeter connected between the two electrodes reads -2.16 V. 

a.    Write the two half-reactions for the cell as written.

b.    The standard reduction potential for Mn2+ + 2e- ® Mn is E° = -1.18 V.  Using this value as a reference, what is the standard reduction potential for Hg2+ ® Hg according to this experiment?

c.     Which metal and metal ion from this system will react spontaneously when combined?

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