Answer Posted / anil shoukat ali

the actual principle is depend on tow mothod of detection
this is
1,coulometary method
2,volumatry method
both method are differ only in the delivary of iodine and
detection of water
since we know one iodine molecules is consumed by one one
molecule of water so if

we calculate how much iodine is reacted with water in
sample then we can easily

calculatethe amount of water(this is the principle of
volumatry method)

the second method is differ that we provide iodine molecule
by oxidation of 2 iodide ions by electric method.and the
reaction is same as in above equation.
we calculate iodine by the faraday principle that is
amount of iodine that is oxidised is directly proprtional
to the amount of charge or electricity is consumed to
conver iodide ions in to iodine

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