What is entire principle involved in karl fischer titration
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Answer Posted / jagadeesh chandra
What anil shoukhat had told is good.
The rxn is based on the bunsen reaction between iodine and
sulphur dioxide in presence of a base.Oxidation of sulphur
dioxide by iodine.The rxn is same as that of iodometry
titration.
I2+So2+2H2O--->2HI+H2So4.
Alcohol reacts with sulphur dioxide and a base to form an
intermediate alkyl suphite salt,which is then oxidised by
iodine to alkyl sulphate salt.
H2O+I2+SO2 + 3 C5H5N �� 2(C5H5N+H)I- + C5H5N��SO3
C5H5N��SO3 + CH3OH �� (C5H5N+H)O-SO2��OCH3.
Pyridine is used as a neutrilizing base.In order to shift
the equilbrium to the right of the rxn and to neutralise
the acids produced pyridine is used as the neutralizing
base.
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