Page 150 - Instant notes
P. 150
Physical chemistry 136
are the equations for calculating the change in standard Gibbs free energy, entropy,
enthalpy and volume of the half-cell reduction reaction. This allows and
values to be calculated from the temperature and pressure variation of the standard
reduction potentials. values are small for half-cells involving solid, liquid and ionic
reagents, which means that half-cell potentials are relatively insensitive to pressure
changes. However, volume changes are large for gas electrodes such as the hydrogen
electrode, which is the origin of the sensitivity of its potential to small changes in
pressure.
