Dimethyl sulphoxide USP 2.5LT Go Back


: 67-68-5

Molecular Formula

: C2H6OS

Molecular Weight

: 78.13
Description: A clear, colorless, odorless, hygroscopic liquid. Melts about 18.4°C. Boils at about 189°C.
Solubility: Soluble in water; practically insoluble in acetone, in alcohol, in benzene, in chloroform and in ether.
Identification A (By IR): IR spectra of the sample should be concomittant with IR spectra of the corresponding standard
Identification B (By Chemical test): A deep violet, crystalline solid should obtaine which should soluble in chloroform, yielding a red solution.
Specific gravity (25°C): Between 1.095 to 1.101
Refractive index (25°C): Between 1.4755 and 1.4775
Acidity: Not more than 5.0ml of 0.01N sodium hydroxide should consume
Water: Not more than 0.1%
UV absorbance profile (10mm cell)@275nm: Not more than 0.20
UV absorbance profile (10mm cell)@270nm-350nm: The spectrum is smooth with no absorption maxima.
UV absorbance ratio (A285nm/A275nm): Not more than 0.65
UV absorbance ratio (A295nm/A275nm): Not more than 0.45
Limit of Non volatile residue: Not more than 0.01%
Related compounds : Total impurities: Not more than 0.1%
Assay (Anhydrous basis): Not less than 99.9%
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