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Chemistry class 12th Standard electrode potentials 298k

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Standard electrode potentials (E°) at 298 K (25°C) represent the voltage of an electrode compared to the Standard Hydrogen Electrode (SHE) under standard conditions: 1 M ion concentration, 1 atm gas pressure, and 25°C temperature. The SHE is assigned a potential of 0.00 V, serving as a reference. Electrodes with positive E° values (e.g., Cu²⁺/Cu, +0.34 V) are better oxidizing agents, while those with negative E° values (e.g., Zn²⁺/Zn, -0.76 V) are better reducing agents. Standard electrode potentials help predict redox reaction spontaneity, calculate cell potential (E°cell), and analyze electrochemical processes like corrosion and battery performance.

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Standard Electrode Potentials at 298 K


Half-Reaction E° (V)

Li+ + e- -> Li -3.04

K+ + e- -> K -2.92

Ca2+ + 2e- -> Ca -2.87

Na+ + e- -> Na -2.71

Mg2+ + 2e- -> Mg -2.37

Al3+ + 3e- -> Al -1.66

Zn2+ + 2e- -> Zn -0.76

Fe2+ + 2e- -> Fe -0.44

Ni2+ + 2e- -> Ni -0.25

Pb2+ + 2e- -> Pb -0.13

H+ + e- -> 1/2 H2 0.00

Cu2+ + 2e- -> Cu +0.34

Ag+ + e- -> Ag +0.80

Hg2 2+ + 2e- -> 2Hg +0.85

Fe3+ + e- -> Fe2+ +0.77

Cl2 + 2e- -> 2Cl- +1.36

MnO4- + 8H+ + 5e- -> Mn2+ + 4H2O +1.51

O2 + 4H+ + 4e- -> 2H2O +1.23

F2 + 2e- -> 2F- +2.87

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