Packaging and storage—
Preserve in tight containers, in a cool, dry place.
Identification—
Dissolve 1 g in 25 mL of alcohol, and add 1 mL of a 1 in 1000 solution of 2,6-dichlorophenol-indophenol sodium in alcohol: the blue color of the 2,6-dichlorophenol-indophenol sodium solution is discharged immediately.
Specific rotation 
781S
:
between +21
and +24
.
Test solution:
100 mg per mL, in methanol.
Loss on drying 731—
Dry it in vacuum at 60
for 1 hour: it loses not more than 2.0% of its weight.
Assay—
Dissolve about 300 mg of Ascorbyl Palmitate, accurately weighed, in 50 mL of alcohol, add 30 mL of water, and immediately titrate with 0.1 N iodine VS to a yellow color that persists for not less than 30 seconds. Each mL of 0.1 N iodine is equivalent to 20.73 mg of C22H38O7.
;)
