Nernst Equation Chemistry Notes
Nernst Equation :
Nernst Equation for Electrode Potential-Let an electrode reaction is as follow:
For this reaction, electrode potential measured in relation with standard hydrogen electrode at any concentration can be represented as below:
Here, n = Number of electrons.
→ Effect of Temperature and Concentration of Electrolyte on Cell Potential or Nernst Equation for Cell Potential-Let, cell potential for following Galvanic cell is determined
→ Ecell depends on concentration of both ions, Cu2+ and Zn2+. It increases with the increase in concentration of Cu2+ ions and decreases with the increase in concentration of Zn2+ ions. If this equation is applied to a normal redox reaction in which n electrons are used, then
Here, concentration of all solid metals is taken as 1 mol L-1 and concentration of ions is measured in mol L-1 Here, n = number of electrons.