Which one of the following redox reactions (as written) will generate the highes

Question

Which one of the following redox reactions (as written) will generate the highest cell voltage?

A. Pt / H+ (aq, 1.0 M) / H2 (g, 1 atm) // Ag+ (aq, 1.0 M) / Ag  
B. Pt / H+ (aq, 1.0 M) / H2 (g, 1 atm) // Cu2+ (aq, 1.0 M) / Cu  
C. Ag / Ag+ (aq, 0.5 M) // Ag+ (aq, 0.5 M) / Ag

How will the measured voltage using a Ca2+ -sensitive electrode change for a constant Ca2+ concentration but increasing ionic strength?

A. there is no change  
B. EISE will be lower for high ionic strength  
C. EISE will be higher for high ionic strength  

Explanation / Answer

A. Pt / H+ (aq, 1.0 M) / H2 (g, 1 atm) // Ag+ (aq, 1.0 M) / Ag

B. EISE will be lower for high ionic strength

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