Methyl Red
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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)
(2-[[4-(Dimethylamino)phenyl]azo benzoic Acid; C. I. Acid Red 2),C15H15N3O2 (free acid)-269.30 [493-52-7], C15H14N3O2Na (sodium salt)-291.29 [845-10-3], C15H15N3O2 . HCI (hydrochloride)-305.76 [63451-28-5]-Use ACS reagent grade. The free acid is recommended for nonaqueous titrations, particularly when an aprotic solvent is used. The sodium salt is recommended for titrations in aqueous media and also for nonaqueous titrations where the medium is an amphiprotic solvent. The hydrochloride salt is recommended for titrations in aqueous media and amphiprotic solvents. (USP 1-May-2020)
