Answer Posted / vattikuti rambabu

DST very Barely dissolved in methanol (water very hardly released) due to this reason use DST for KF instrument standardization purpose and one more standard use water for KF standardization purpose,water is very miscible in methanol due to this reason both used for KF standardization .both type of materials (barely released and easily released water) suitable for use instrument.
primary standard it have only two water molecule and gives
very accurate results (all atmosphere stable) .
Dst molicular formula is C4H4Na2O6.2H2O.
This molicular weight is 230.06.
Water content of DST is 15.66.
Calculation:In DST two water molicules are there=2*18=36
=(36/230.06*100)

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