0.05 N Iodine VS
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This article is compiled based on the United States Pharmacopeia (USP) – 2025 Edition
Issued and maintained by the United States Pharmacopeial Convention (USP)
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6.33 g in 1000 mL
Dissolve about 6.5 g of iodine in a solution of 18 g of potassium iodide in 100 mL of water, add 3 drops of hydrochloric acid, and dilute with water to 1000 mL.
Standardization: Transfer 50.0 mL of the iodine solution to a 250-mL flask, dilute with water to 100 mL, add 1 mL of 1 N hydrochloric acid, swirlfigently to mix, and titrate with 0.1 N sodium thiosulfate VS until the solution has a pale yellow color. Add 2 mL of starch TS, and continue titrating until the solution is colorless.
N = (mL Na2S2O3 × N Na2S2O3 )/ 50
[Note—If this volumetric solution is used in a qualitative application such as pH adjustment, dissolution medium, or diluent, its standardization
is not required.]
