R

reaction (anodic, cathodic)
A process of chemical or electrochemical change, particularly taking place at or near an electrode in a cell.

rebox potential
The potential taken up by a platinum electrode with respect to a reference electrode.

NOTE: See A.2.

Reference electrodes:

reference electrode
An electrode the potential of which is accurately reproducible and which serves as a basis of comparison in the measurement of other electrode potentials.

NOTE: Sometimes termed a 'half cell'

calomel reference electrode
A reference electrode consisting of mercury and mercurous chloride (calomel) in a standard solution of potassium chloride.

copper/copper sulphate reference electrode
A reference electrode consisting of copper in a saturated copper sulphate solution.

silver / silver chloride reference electrode
A reference electrode consisting of silver, coated with silver chloride, in an electrolyte containing chloride ions.