Question

Calculate the standard electrode potential for the redox reaction where Ag(s) is oxidized by Cu2+(aq) to form Ag+(aq) and Cu(s) given that the standard reduction potential for Ag+(aq) + e- → Ag(s) is 0.80 V and for Cu2+(aq) + 2e- → Cu(s) is 0.34 V.

Answer 1

To calculate the standard electrode potential for the redox reaction, we need to determine the standard oxidation potential for Ag s   Ag+ aq  + e- and then combine it with the standard reduction potential for Cu2+ aq  + 2e-  Cu s .First, we find the standard oxidation potential for Ag s   Ag+ aq  + e-. Since we know the standard reduction potential for the reverse reaction  Ag+ aq  + e-  Ag s   is 0.80 V, we can find the standard oxidation potential by changing the sign:Standard oxidation potential for Ag s   Ag+ aq  + e- = -0.80 VNow, we can combine the standard oxidation potential for Ag s   Ag+ aq  + e- with the standard reduction potential for Cu2+ aq  + 2e-  Cu s :Standard electrode potential = Standard oxidation potential  Ag  + Standard reduction potential  Cu Standard electrode potential =  -0.80 V  +  0.34 V Standard electrode potential = -0.46 VThe standard electrode potential for the redox reaction where Ag s  is oxidized by Cu2+ aq  to form Ag+ aq  and Cu s  is -0.46 V.