p-Phenylenediamine Hydrochloride
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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)
(1,4-Diaminobenzene Dihydrochloride), C6H8N2 · 2HCl 181.06—White to pale tan crystals or crystalline powder, turning red on exposure to air. Freely soluble in water; slightly soluble in alcohol and in ether. Preserve in well-closed containers, protected from light.
Insoluble Matter: Dissolve 1 g in 10 mL of water: the solution is clear and complete.
Molar Absorptivity (see Ultraviolet-Visible Spectroscopy〈857〉): Dissolve 60 mg in 100.0 mL of water, and mix. Pipet 2 mL of this solution into a 50-mL volumetric flask, dilute with pH 7 buffer solution to volume, and mix. The molar absorptivity of this solution, at 239 nm, is not less than 9000.
