Ethanesulfonic 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)
C2H5SO3H 110.13 CAS RN®: 594-45-6.—Colorless to light yellow liquid. Soluble in water.
Assay: Accurately weigh about 300 mg, dissolve in 30 mL of water, add phenolphthalein TS, and titrate with 0.1 N sodium hydroxide VS. Each mL of 0.1 N sodium hydroxide is equivalent to 11.013 mg of C H SO H: between 94.0% and 106.0% is found.
Refractive Index〈831〉: between 1.432 and 1.436 at 20°.
