Loss on drying 731
Dry about 500 mg, accurately weighed, in vacuum over phosphorus pentoxide at 80
for 4 hours: it loses not more than 0.5% of its weight.
Dissolve about 750 mg of Tropicamide, accurately weighed, in 80 mL of glacial acetic acid, add 4 drops of crystal violet TS
, and titrate with 0.1 N perchloric acid VS to a blue-green endpoint. Perform a blank determination, and make any necessary correction. Each mL of 0.1 N perchloric acid is equivalent to 28.44 mg of C17