Standard Preparation:-
A stock standard solution equivalent to 800mg/l
aspirin was prepared by dissolving 61.0mg of
salicylic acid in 2ml of 1.0M NaOH in a 100.0ml
volumetric flask. This solution was then diluted
to volume with purified water. Working standards
were prepared by pipetting 10, 8, 6, 4 and 2 ml
aliquots of the stock standard solution into
separate 100.0ml volumetric flasks and diluting
to volume with 0.025M FeCl3.