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NEET • Chemistry

Electrochemistry

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Electrode and Cell Potential

Electrochemistry begins with oxidation/reduction potential and cell potential relations.

Oxidation potential=−Reduction potential\text{Oxidation potential}=-\text{Reduction potential}
Ecell=R.P. of cathode−R.P. of anodeE_{cell}=\text{R.P. of cathode}-\text{R.P. of anode}
Ecell=R.P. of cathode+O.P. of anodeE_{cell}=\text{R.P. of cathode}+\text{O.P. of anode}
Ecell∘=SRP of cathode−SRP of anodeE^\circ_{cell}=\text{SRP of cathode}-\text{SRP of anode}
galvanic cell concept
e-anodecathodelow R.P.high R.P.

Variables & Notation

EE

electrode potential, cell emf, or equivalent weight depending on context

Notes

  • EcellE_{cell} is always a positive quantity; the anode is the electrode of low R.P. Greater SRP means greater oxidising power.