Mercury coulometer



Mercury coulometer is based on the electrochemical processes of oxidation/reduction with according of the follow reaction:
Hg2+ +e = Hg
These oxidation/reduction processes have 100% efficienty with the wide range of the current densities. Measuring of the quantity of electricity (anodic dissolution of the metal.
Q = \frac{ \Delta\ m*2*F}{200.59},
where Q-quantity of electricity (coulombs); \Delta\ m-mass changes (gr); F-Faraday constant (96485);

Construction

  This coulometer has different constructions but all of them are based on mass measurements. One of the most significant construction is shown on the picture. It consists of two reservoirs connected by a thin graduated capillary. All system contains solution of the mercury(II)-ions solution. Each of the reservoirs have an electrode immersed into a drop of coulometers depends on the diameter of the capillary.

See also
 
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