Reduction Half-Reaction Standard Potential E red ° (V) F 2 (g) + 2e – ? 2F – (aq

Question

Reduction Half-Reaction Standard Potential Ered° (V) F2(g) + 2e– ? 2F–(aq) +2.87 O3(g) + 2H3O+(aq) + 2e– ?  O2(g) + 3H2O(l) +2.076 Co3+(aq) + e– ?  Co2+(aq) +1.92 H2O2(aq) + 2H3O+(aq) + 2e– ?  2H2O(l) +1.776 N2O(g) + 2H3O+(aq) + 2e– ?  N2(g) + 3H2O(l) +1.766 Ce4+(aq) + e– ? Ce3+(aq) +1.72 PbO2(s) + SO42–(aq) + 4H3O+(aq) + 2e– ? PbSO4(s) + 6H2O(l) +1.6913 MnO4–(aq) + 4H3O+(aq) + 3e– ?  MnO2(s) + 6H2O(l) +1.679 NiO2(s) + 4H3O+(aq) + 2e– ?  Ni2+(aq) + 6H2O(l) +1.678 HClO2(aq) + 2H3O+(aq) + 2e- ? HClO(aq) + 3H2O(l) +1.645 2HClO2(aq) + 6H3O+(aq) + 6e- ? Cl2(g) + 10H2O(l) +1.628 2HClO(aq) + 2H3O+(aq) + 2e– ? Cl2(g) +4H2O(l) +1.611 H5IO6(s) + H3O+(aq) + 2e– ?  IO3–(aq) + 4H2O(l) +1.601 RuO4-(aq) + 4H3O+(aq) + 2e- ? RuO2+(aq) + 6H2O(l) +1.6 2NO(g) + 2H3O+(aq) + 2e– ?  N2O(g) + 3H2O(l) +1.591 IO4-(aq) + 2H3O+(aq) + 2e– ? IO3-(aq) + 3H2O(l) +1.589 MnO4–(aq) + 8H3O+(aq) + 5e– ?  Mn2+(aq) + 12H2O(l) +1.507 RuO2+(aq) + 2H3O+(aq) + e- ? Ru(OH)22+(aq) + 2H2O(l) +1.5 Au3+(aq) + 3e– ? Au(s) +1.498 2ClO3-(aq) + 12H3O+(aq) + 10e- ? Cl2(g) + 18H2O(l) +1.47 PbO2(s) + 4H3O+(aq)+ 2e– ? Pb2+(aq) + 6H2O(l) +1.455 ClO3–(aq) + 6H3O+(aq) + 6e– ?  Cl–(aq) + 9H2O(l) +1.451 BrO3–(aq) + 6H3O+(aq) + 5e– ? 1/2Br2(l) + 9H2O(l) +1.482 HOI(aq) + H3O+(aq) + e– ? 1/2I2(s) + 2H2O(l) +1.430 RuO4(aq) + 6H3O+(aq) + 4e- ? Ru(OH)22+(aq) + 8H2O(l) +1.40 2ClO4–(aq) + 16H3O+(aq) + 14e– ? Cl2(g) + 24H2O(l) +1.39 ClO4–(aq) + 8H3O+(aq) + 8e– ? Cl–(aq) + 12H2O(l)   +1.389 Cl2(g) + 2e– ? 2Cl–(aq) +1.36 ClO4–(aq) + 6H3O+(aq) + 6e– ? ClO–(aq) + 9H2O(l) +1.36 HBrO(aq) + H3O+(aq) + 2e– ? Br– + 2H2O(l) +1.331 IO4-(aq) + 8H3O+(aq) + 7e– ? 1/2I2(s) + 12H2O(l) +1.318 ClO2(aq) + H3O+(aq) + e- ? HClO2(aq) + H2O(l) +1.277 Cr2O72–(aq) + 14H3O+(aq) + 6e– ? 2Cr3+(aq) + 21H2O(l) +1.232 O2(g) + 4H+(aq) + 4e– ? 2H2O(l) +1.23 MnO2(s) + 4H3O+(aq) + 2e– ? Mn2+(aq) + 6H2O(l) +1.224 ClO3-(aq) + 3H3O+(aq) + 2e- ? HClO2(aq) + 4H2O(l) +1.214 2IO3–(aq) + 12H3O+(aq) + 10e– ? I2(s) + 18H2O(l) +1.195 ClO4–(aq) + 2H3O+(aq) + 2e– ? ClO3–(aq) + 3H2O(l) +1.189 Pt2+(aq) + 2e– ?  Pt(s) +1.18 IO3-(aq) + 5H3O+(aq) + 4e– ? HOI(aq) + 7H2O(l) +1.154 ClO3-(aq) + 2H3O+(aq) + e- ? ClO2(aq) + 3H2O(l) +1.152 Br2(aq) + 2e– ?  2Br–(aq) +1.0873 Br2(l) + 2e– ? 2Br–(aq) +1.07 RuO4(aq) + 8H3O+(aq) + 8e- ? Ru(s) + 12H2O(l) +1.04 NO2(g) + 2H3O+(aq) + 2e– ?  NO(g) + 3H2O(l) +1.03 RuO4(aq) + e- ? RuO4-(aq) +1.00 NO3–(aq) + 4H3O+(aq) +3e– ?  NO(g) + 6H2O(l) +0.957 2Hg2+(aq) + 2e– ?  Hg22+(aq) +0.920 Ru(OH)22+(aq) + 2H3O+(aq) + e- ? Ru3+(aq) + 4H2O(l) 0.86 Hg2+(aq) + 2e– ?  Hg(l) +0.851 ClO–(aq) + H2O(l) + 2e– ? Cl–(aq) + 2OH–(aq) +0.81 Ag+(aq) + e– ? Ag(s) +0.80 Hg22+(aq) + 2e– ?  2Hg(l) +0.7973 Fe3+(aq) + e– ?  Fe2+(aq) +0.771 Ni(OH)2(s) + 2e– ?  Ni(s) + 2OH–(aq) +0.72 p-benzoquinone + H3O+(aq) + 2e– ?  hydroquinone + H2O(l) +0.6992 O2(g) + 2H3O+(aq) + 2e– ?  H2O2(l) + 2H2O(l) +0.695 Ru(OH)22+(aq) + 2H3O+(aq) + 4e- ? Ru(s) + 4H2O(l) +0.68 MnO4–(aq) + 2H2O(l) + 3e– ?  MnO2(s) + 4OH–(aq) +0.595 I2(s) + 2e– ? 2I–(aq) +0.54 I3–(aq) + 2e– ? 3I–(aq) +0.536 Cu+(aq) + e– ? Cu(s) +0.52 Ru2+(aq) + 2e- ? Ru(s) +0.455 O2(g) + 2H2O + 4e– ?  4OH–(aq) +0.401 Fe(CN)63–(aq) + e– ?  Fe(CN)64–(aq) +0.358 Cu2+(aq) + 2e– ? Cu(s) +0.34 Hg2Cl2(s) + 2e– ?  2Hg(l) + 2Cl–(aq) +0.26808 Ru3+(aq) + e- ? Ru2+(aq) +0.249 HAsO2(s) + 3H3O+(aq) + 3e– ? As(s) + 5H2O +0.248 AgCl(s) + e– ?  Ag(s) + Cl-(aq) +0.22233 Cu2+(aq) + e– ?  Cu+(aq) +0.153 Sn4+(aq) +2e– ?  Sn2+(aq) +0.151 S(s) + 2H3O+(aq) + 2e– ?  H2S(s) + 2H2O(l) +0.14 NO3–(aq) +2H2O(l) + 3e– ? NO(g) + 4OH–(aq) +0.109 N2(g) + 8H3O+(aq) + 6e– ?  2NH4+(aq) +8H2O(l) +0.092 S4O62–(aq) + 2e– ?  2S3O32–(aq) +0.08 AgBr(s) + e– ?  Ag(s) + Br–(aq) +0.07133 2H+(aq) + 2e– ? H2(g) 0.00 Fe3+(aq) + 3e– ? Fe(s) -0.04 [Co(NH3)6]3+(aq) + e– ?  [Co(NH3)6]2+(aq) -0.108 Pb2+(aq) + 2e– ? Pb(s) –0.13 Sn2+(aq) + 2e– ? Sn(s) –0.14 O2(g) + 2H2O(l) + 2e– ?  H2O2(l) + 2OH–(aq) –0.146 AgI(s) + e– ?  Ag(s) + I– (aq) –0.15224 CO2(g) + 2H3O+(aq) + 2e– ?  HCO2H(s) + 2H2O(l) –0.199 Cu(OH)2(s) + 2e– ?  Cu(s) + 2OH–(aq) –0.222 Ni2+(aq) + 2e– ? Ni(s) –0.26 Co2+(aq) + 2e– ? Co(s) –0.28 PbSO4(s) + 2e– ?  Pb(s) + SO42–(aq) –0.3588 SeO32–(aq) + 3H2O(l) + 4e– ?  Se + 6OH–(aq) –0.366 Cd2+(aq) + 2e– ?   Cd(s) –0.403 Cr3+(aq) + e– ?  Cr2+(aq) –0.407 Fe2+(aq) + 2e– ? Fe(s) –0.44 NO2–(g) + H2O(l) + 3e– ?  NO(g) + 2OH–(aq) –0.46 S(s) + 2e– ? S2–(aq) –0.48 2CO2(g) + 2H3O+(aq) + 2e– ?  H2C2O4(s) + H2O(l) –0.49 TiO2(s) + 4H3O+ + 2e– ?  Ti2+(aq) + 6H2O(l) –0.502 Au(CN)2–(aq) + e– ?  Au(s) + 2CN–(aq) –0.60 Cr3+(aq) + 3e– ? Cr(s) –0.74 Zn2+(aq) + 2e– ? Zn(s) –0.76 Cd(OH)2(s) + 2e– ?   Cd(s) + 2OH–(aq) –0.809 2H2O(l) + 2e– ? H2(g) + 2OH–(aq) –0.83 Ti3+(aq) + e– ?  Ti2+(aq) –0.85 H3BO3(s) + 3H3O+ + 3e– ?  B(s) + 6H2O(l) –0.8698 Cr2+(aq) + 2e– ? Cr(s) –0.91 SO42–(aq) + H2O(l) + 2e– ?  SO32–(aq) + 2OH–(aq) –0.93 CNO–(aq) + H2O(l) + 2e– ?  CN–(aq) + 2OH–(aq) –0.970 [Zn(NH3)4]2+(aq) + 2e– ?  Zn(s) + 4NH3(aq) –1.04 Mn2+(aq) + 2e– ?  Mn(s) –1.185 Cr(OH)3(s) + 3e– ? Cr(s) + 3OH–(aq) –1.48 Ti2+(aq) + 2e– ?  Ti(s) –1.630 Al3+(aq) + 3e– ? Al(s) –1.66 Al(OH)3(s) + 3e– ? Al(s)+3OH–(aq) –2.31 Mg2+(aq) + 2e– ? Mg(s) –2.38 Mg(OH)2(s) + 2e– ? Mg(s) + 2OH–(aq) –2.69 Na+(aq) + e– ? Na(s) –2.71 Ca2+(aq) + 2e– ? Ca(s) –2.87 Ba2+(aq) + 2e– ? Ba(s) –2.912 K+(aq) + e– ?  K(s) –2.931 Ba(OH)2(s) + 2e– ?  Ba(s) + 2OH–(aq) –2.99 Ca(OH)2(s) + 2e– ?  Ca(s) + 2OH–(aq) –3.02 Cs+(aq) + e– ? Cs(s) –3.026 Li+(aq) + e– ? Li(s) –3.04 Using a a of standard reduction potentials, determine the best answer to the following questions. table of a) Which of the following reagents would oxidize Zn to Zn 2+ but not Ag to Ag O 2+ Co O Co Ca O Br2 O Ca 2+ O Br b) Which of the following reagents would oxidize Ag to Ag but not CIT to Cl2? Br2 O Co O Br O Ca 2+ O Co 2+ O Ca

Explanation / Answer

elements with higher reduction potential will undergo reduction more easily and it will be able to oxdise other elements. Hence ions at top of table undergo reduction and will able to oxidise elements below

Based on these

a) we see elements above Zn2+ and below Ag+

answer is Co2+

b) we see elemnt above AG+ and below Cl2

answer is Br2

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