Describe the construction and working of manual Polarography? #Polarography | Analytical Chemistry
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It is consist of reservoir
It is consist of reservoir containing Hg Rubber tubing is attached with reservoir and at the end of rubber tubing capillary is fixed. The drop of Hg is falling through the electrolyte. This drop of Hg acts as cathode (D.M.E.). The flask or the beaker contains the experimental soln. The large amount of Hg at the bottom acts as anode. Anode is connected to shunt, galvanometer and then to +ve terminal of battery. The height of Hg reservoir is adjusted that Hg falls at the rate of 2030 drops per minute Close the circuit and keep the jockey S on X. For this position of Jockey, find out the reading of voltmeter and galvanometer. The jockey was moved from X to Y slowly and for each position of jockey, takes the readings of voltmeter and galvanometer. Now plot a graph of current V/S Volt applied. The graph thus obtained is known as Polarogram. From the graph we can have qualitative as well as quantitative analysis.
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