Physical Chemistry Third Edition

A Tables of Numerical Data 1227

Table A.13 Some Standard Reduction Potentials in Aqueous Solution at

25 ◦C and P◦ 1 bar

Half-Cell Symbol Half-Reaction E◦V

F−|F 2 |Pt F 2 (g)+ 2 e−→2F− + 2. 87

H 2 SO 4 |PbSO 4 |PbO 2 PbO 2 +SO^24 −+4H++ 2 e−→PbSO 4 +2H 2 O + 1. 685

Ce^3 +,Ce^4 +|Pt Ce^4 ++e−→Ce^3 + + 1. 61

(in 1M HNO 3 )

Mn^2 +,MnO− 4 |Pt MnO− 4 +8H++ 5 e−→Mn^2 ++4H 2 O + 1. 491

Au^3 +|Au Au^3 ++ 3 e−→Au + 1. 42

Cl−|Cl 2 |Pt Cl 2 + 2 e−→2Cl− + 1. 3583

O 2 (g),H 2 O|Pt O 2 +4H++ 4 e−→2H 2 O + 1. 229

Br−|Br 2 |Pt Br 2 + 2 e−→2Br− + 1. 065

Au|AuCl− 4 |Cl− AuCl− 4 + 3 e−→Au(s)+4Cl− + 1. 002

Ag|Ag+ Ag++e−→Ag + 0. 7986

Hg^22 +|Hg(l)|Pt Hg^22 + 2 e− →2Hg(l) + 0. 7961

Fe^2 +|Fe^3 +|Pt Fe^3 ++e− →Fe^2 + + 0. 770

MnO 2 |MnO− 4 |Pt MnO− 4 +2H 2 O+ 3 e−→MnO 2 +4OH− + 0. 588

I−|I 2 (s)|Pt I 2 (s)+ 2 e−→2I− + 0. 535

I−|I 2 (aq)|Pt I 2 (aq)+ 2 e−→2I− + 0. 6197

I−,I− 3 |Pt I− 3 + 2 e−→3I− + 0. 5338

OH−|O 2 (g)|Pt O 2 +2H 2 O+ 4 e−→4OH− + 0. 401

Cu(s)|Cu^2 + Cu^2 ++ 2 e−→Cu(s) + 0. 3402

Cl−|Hg 2 Cl 2 (s)|Hg(l) Hg 2 Cl2(s)+ 2 e−→2Hg(l) + 2Cl− + 0. 268

Cl−|AgCl(s)|Ag(s) AgCl(s)+e−→Ag(s)+Cl− + 0. 2223

Sn^4 +,Sn^2 +|Pt Sn^4 ++ 2 e−→Sn^2 + + 0. 15

Br−|AgBr(s)|Ag(s) AgBr(s)+e−→Ag(s)+Br− + 0. 0713

H+|H 2 |Pt 2H++ 2 e−→H 2 0. 000

Fe^3 +|Fe(s) Fe^3 ++ 3 e−→Fe(s) − 0. 036

I−|Hg 2 I 2 (s)|Hg(l) Hg 2 I 2 (s)+ 2 e−→2Hg(l)+2I− − 0. 0405

Pb^2 +|Pb(s) Pb^2 ++ 2 e−→Pb(s) − 0. 1263

I−|AgI(s)|Ag(s) AgI(s)+e−→Ag(s)+I− − 0. 1519

Cd^2 +|Cd(in Hg) Cd^2 ++ 2 e−→Cd(in Hg) − 0. 3521

SO^24 −|PbSO 4 (s)|Pb(s) PbSO 4 (s)+ 2 e−→Pb(s)+SO^24 − − 0. 356

Cd^2 +|Cd(s) Cd^2 ++ 2 e−→Cd(s) − 0. 4026

Fe^2 +|Fe(s) Fe^2 ++ 2 e−→Fe(s) − 0. 44

S^2 −|Ag 2 S(s)|Ag(s) Ag 2 S(s)+ 2 e−→2Ag(s)+S^2 − − 0. 7051

Zn^2 +|Zn(s) Zn^2 ++ 2 e−→Zn(s) − 0. 7628

OH−|H 2 (g)|Pt 2H 2 O+ 2 e−→H 2 +2OH− − 0. 8277

Mg^2 +|Mg(s) Mg^2 ++ 2 e−→Mg(s) − 2. 375

Na+|Na(s) Na+e−→Na(s) − 2. 7109

Ca^2 +|Ca(s) Ca^2 ++ 2 e−→Ca(s) − 2. 868

K+|K(s) K++e−→K(s) − 2. 925

Li+|Li(s) Li++e−→Li(s) − 3. 045