A mad scientist is attempting to make copper metal via the reaction:   Cu2+ (aq) + Cr (s) → Cu (s) + Cr3+   a) Use the chart below to find the standard cell potential (E0cell) b) Based on the number of half reactions, what is the number of electrons (n) that would be exchanged in a complete reaction?   c) Calculate the cell potential for this reaction at 20.7 °C when [Cu2+] = 0.191 M and [Cr3+] = 0.061 M.

Chemistry: Principles and Practice
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Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
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Chapter18: Electrochemistry
Section: Chapter Questions
Problem 18.98QE
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A mad scientist is attempting to make copper metal via the reaction:

 

Cu2+ (aq) + Cr (s) → Cu (s) + Cr3+

 

a) Use the chart below to find the standard cell potential (E0cell)


b) Based on the number of half reactions, what is the number of electrons (n) that would be exchanged in a complete reaction?

 

c) Calculate the cell potential for this reaction at 20.7 °C when [Cu2+] = 0.191 M and [Cr3+] = 0.061 M.

Half-Reaction
E° (V)
Cu* + e - Cu (s)
Cu2* + 2 e → Cu (s) 0.34
Cu2+ + e → Cu*
0.52
0.15
Cr3* + e - Cr2+
-0.41
Cr3* + e → Cr (s)
-0.74
Cr2* + e → Cr (s)
-0.91
Transcribed Image Text:Half-Reaction E° (V) Cu* + e - Cu (s) Cu2* + 2 e → Cu (s) 0.34 Cu2+ + e → Cu* 0.52 0.15 Cr3* + e - Cr2+ -0.41 Cr3* + e → Cr (s) -0.74 Cr2* + e → Cr (s) -0.91
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