Answer / navinpatel

Karl Fischer titration method is used to for the
titrimetric determination of water in samples. Because of
KF reagent undergoes the slow deterioration, the reagent
has to be standardized frequently, before going for the
water determination in sample.

Disodium tartrate is used as a primary standard substance
for the standardization because of the following properties:

1. Available in a stable crystalline hydrate form
2. Its water content is close to theoretical value
3. Substances in nearly 100% purity
4. More favorable gravimetric factors
5. Stable at extreme humidities
6. It is relatively insoluble in absolute methanol
7. Its water content is rapidly and quantitatively titrated
to a sharp end point

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