Question

Calculate the standard cell potential for the following electrochemical reaction: Zn (s) + 2 Ag+ (aq) → Zn2+ (aq) + 2 Ag (s)Given: Standard Reduction Potentials are E°Zn2+ = -0.76 V, E°Ag+ = 0.80 V.

Answer 1

To calculate the standard cell potential for the given electrochemical reaction, we need to determine the standard reduction potentials for both half-reactions and then combine them.The given standard reduction potentials are:EZn2+ = -0.76 V  Zn2+ + 2e-  Zn EAg+ = 0.80 V  Ag+ + e-  Ag First, we need to reverse the Zn2+ half-reaction to make it an oxidation reaction:Zn  Zn2+ + 2e-  This will also reverse the sign of the standard reduction potential EZn = 0.76 VNow, we can combine the two half-reactions:Oxidation: Zn  Zn2+ + 2e-  EZn = 0.76 V Reduction: 2 Ag+ + e-  Ag   EAg+ = 0.80 V The overall reaction is:Zn  s  + 2 Ag+  aq   Zn2+  aq  + 2 Ag  s To find the standard cell potential, we add the standard reduction potentials of the two half-reactions:Ecell = EZn + EAg+ = 0.76 V + 0.80 V = 1.56 VThe standard cell potential for the given electrochemical reaction is 1.56 V.