Packaging and storage—
Preserve in tight, light-resistant containers.
Identification—
B:
A solution (1 in 50) reduces alkaline cupric tartrate TS slowly at room temperature but more readily upon heating.
Specific rotation 
781S
:
between +20.5
and +21.5
, the optical rotation being measured immediately, following the preparation of the solution.
Test solution:
100 mg per mL, in carbon dioxide-free water.
Organic volatile impurities, Method IV 467:
meets the requirements.
Assay—
Dissolve about 400 mg of Ascorbic Acid, accurately weighed, in a mixture of 100 mL of water and 25 mL of 2 N sulfuric acid. Add 3 mL of starch TS, and titrate at once with 0.1 N iodine VS. Each mL of 0.1 N iodine is equivalent to 8.806 mg of C6H8O6.
;)
