2-Naphthalenesulfonic Acid,
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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)
C10H8O3S · H2O 226.25 CAS RN®:120-18-3,-Off-white to light gray crystals. Soluble in water.
Assay: Dissolve about 1 g, accurately weighed, in 100 mL of water, add phenolphthalein TS, and titrate with 0.1 N sodium hydroxide VS. Perform a blank determination, and make any necessary correction. Each mL of 0.1 N sodium hydroxide is equivalent to 22.63 mg of C10H8O3S · H2O. Not less than 98.0% is found.
MELTING RANGE (741): between 122° and 126°, but the range between beginning and end of melting does not exceed 2°.
