o-Dichlorobenzene
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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)
C6H4Cl2 147.00 CAS RN®: 95-50-1. - Clear liquid, having a light yellowish-brown tint (about APHA 20). Practically insoluble in water. Miscible with alcohol and with ether. Boils at about 180°.
Assay: When examined by gas–liquid chromatography, with the use of suitable apparatus and conditions, it shows a purity of not less than 98%.
Density: between 1.299 and 1.301.
Refractive Index 〈831〉: between 1.548 and 1.550 at 25°.
Residue on Evaporation: Evaporate 80 mL on a steam bath, and dry at 105° for 1 hour: the residue weighs not more than 50 mg (0.005%).
Acidity: Add phenolphthalein TS to 25 mL of methanol, and titrate with 0.02 N alcoholic potassium hydroxide VS until a faint pink color persists for 15 seconds. Pipet 25 mL of test specimen into the solution; mix, avoiding exposure to the atmosphere; and titrate with 0.02 N alcoholic potassium hydroxide VS: not more than 2.2 mL is required to restore the pink color (about 0.005%).
