If i have one drug standard with having purity of 100.00 % by HPLC. and water content 0.4% by karl fisher.
if i want to convert the above purity on as is basis than shall i use below mentioned formula??
100-water content x given purity / 100= as is basis purity.
100-0.4 x 100.00 / 100=99.60% on as is basis.
Kindly reply me ASAP.