Some terms used in electro-gravimetric analysis

2 SOME TERMS USED IN ELECTRO-GRAVIMETRIC ANALYSIS 

Cathode. The cathode is the electrode at which reduction occurs. In an electrolytic cell it is the electrode attached to the negative terminal of the source, since electrons leave the source and enter the electrolysis cell at that terminal. The cathode is the positive terminal of a galvanic cell, because such a cell accepts electrons at this terminal. 

The anode is the electrode at which oxidation occurs. It is the positive terminal of an electrolysis cell or the negative terminal of a voltaic cell. 

Polarised electrode. An electrode is polarised if its potential deviates from the reversible or equilibrium value. An electrode is said to be depolarised by a substance if that substance lowers the amount of polarisation. 

Current density. The current density is defined as the current per unit area of electrode surface. It is generally expressed in amperes per square centimetre (or per square decimetre) of the electrode surface. 

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