Packaging and storage—
Preserve in tight containers, protected from light, and avoid exposure to excessive heat.
Identification—
A:
Dissolve 1 g in 10 mL of water: the solution responds to the test for
Potassium 
191
.
B:
Dissolve 0.2 g in 2 mL of water, and add a few drops of bromine TS: the color is discharged.
Acidity or alkalinity—
Dissolve 1.1 g in 20 mL of water, and add phenolphthalein TS. If the solution is colorless, titrate with 0.10 N sodium hydroxide to a pink color that persists for 15 seconds: not more than 1.1 mL is required. If the solution is pink in color, titrate with 0.10 N hydrochloric acid: not more than 0.80 mL is required to discharge the pink color.
Assay—
Dissolve about 300 mg of Potassium Sorbate, accurately weighed, in 40 mL of glacial acetic acid, warming, if necessary, to effect solution. Cool to room temperature, add 1 drop 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 15.02 mg of C
6H
7KO
2.
;)
for 3 hours: it loses not more than 1.0% of its weight.