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what is karl fischer principle and reaction ,describe it
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Answer Posted / suresh babu
The fundamental principle behind it is based on the Bunsen
reaction between iodine and sulfur dioxide in an aqueous
medium.
Water and iodine are consumed in a 1:1 ratio in the above
reaction. Once all of the water present is consumed, the
presence of excess iodine is detected voltametrically by
the titrator’s indicator electrode. That signals the end-
point of the titration.
The amount of water present in the sample is calculated
based on the concentration of iodine in the Karl Fisher
titrating reagent (i.e., titer) and the amount of Karl
Fisher reagent consumed in the titration.
B·I2 + B·SO2 + B + H2O → 2BH+I− + BSO3
BSO3 + ROH → BH+ROSO3−
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