Answer / s jagadeesh chandra

First of all DST is a crystallin hydrate.

Dst is used in factor determination using karl fischer
titration bcos....

1) It absorbs precise amounts of water.
2) It contains therotically caliculated water content.
ie.. 15.66% of water.Water content in dst is constant
in more cases,ie it can with stand small changes in
climatic and temp changes in laboratory.
3) Easily available in market with 100% purity in reagent
grade.And it is a primary standard too.

Answer / praveena

for hardness

could u send me the model papers available for drug inspector exam.

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