Nernst Equation: Dependence of emf on Concentration
A U tube is used to construct a Cu-Zn battery. The concentration of the Cu and/or Zn solution is varied and the emf is measured to show that it varies with concentration.
The emf of a cell depends on the concentrations of ion and on gas pressures. Nernst equation relates the cell emf's for various concentrations and gas pressures to standard electrode potentials.