Electrogravimetry and Coulometry:

We have elaborates conductometric and potentiometry methods. You have looks in potentiometry measurements are performed under conditions of fundamentally zero current.  Within this unit, we define two significant associated electroanalytical techniques -coulometry and electrogravimetry. In the two techniques that we are going to deal, electrolysis is carried out long sufficient to make sure in which the analyte is fully oxidised or decreased to a single product.  In electrogravimetry, a product is weighed as a deposit on one of the electrodes.  Within coulometry, the quantity of electricity required to done the electrolysis is measured as coulombs.  Both the methods are quite sensitive, accurate and rapid.

Both these methods differ from potentiometry within the sense which they needs an important current (a needed amount of current to initiate the electrode reaction) throughout the procedure. Therefore, in potentiometry measurements are performed under conditions of fundamentally zero current.  While there is a current within an electrochemical cell, a cell potential is no longer the difference among the electrode potentials of the cathode and the anode. The applied potential within an electrolytical cell is commonly greater than the theoretical potential and the phenomenon of ohmic potential (IR drop) and polarisation will come with effect.

We shall define the principle and instrumentation of electrogravimetry and later the methodology, principle and applications of coulometry.  The importance of those two analytical methods in quantitative analysis will be elaborates.