Metaphenylenediamine 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)
(Metaphenylenediamine Dihydrochloride), C6H4(NH2)2.2HCI 181.06-White or slightly reddish-white, crystalline powder. Easily soluble in water. On exposure to light it acquires a reddish color. Store it protected from light.
1 Solubility
A solution of 1 g in 200 mL of water is colorless.
2 Residue on Ignition (Reagent test)
Ignite 1 g with 0.5 mL of sulfuric acid: the residue weighs not more than 1 mg (0.1%).
[NOTE-Metaphenylenediamine hydrochloride solution can be decolorized by treatment with a small quantity of activated charcoal.]
