Methyl alcohol USP-NF/Ph.Eur 2.5LT Go Back


: 67-56-1

Molecular Formula


Molecular Weight

: 32.04
Appearance/Description: Clear, colorless, volatile, hygroscopic liquid and having a characteristic odor.
Solubility: Miscible with water, with alcohol, with ether, with benzene, with methylene chloride and with most other organic solvents.
Boiling point: About 64°C.
Identification (By IR): IR spectra of the Sample should be concomitant with Reference spectrum of Methanol.
Identification (By Chromatogram): The retention time of the major peak of the Sample solution corresponds to that of the Standard solution.
Identification (By Refractive index, 20 ± 0.5°C): 1.328 – 1.330
Appearance: Solution should be clear and colorless.
Acidity or Alkalinity: NMT 0.9 mL of 0.01M sodium hydroxide should require to change the color of the indicator to pink.
Alkalinity (as ammonia): NMT 0.20 mL of 0.020 N sulfuric acid is required to produce a pink color (3 ppm)
Relative density (20°C): 0.791 – 0.793
UV absorbance profile (10mm cell) at 230nm: NMT 0.15
UV absorbance profile (10mm cell) at 250nm: NMT 0.05
UV absorbance profile (10mm cell) at 270nm: NMT 0.02
UV absorbance profile (10mm cell) at 290nm: NMT 0.01
Readily carbonizable substances: No discoloration should develop.
Readily oxidizable substances: The pink color should not completely disappear within 5 min.
Impurity A (Benzene): NMT 2 ppm v/v
Related substances (Any impurity): NMT 0.1%
Related substances (Total impurity): NMT 0.3%
Nonvolatile residue / Residue on evaporation: NMT 0.001% w/w
Water: NMT 0.10%
Assay: NLT 99.5%
Acetone and Aldehyde (as acetone): Any turbidity produced in the Sample solution is not greater than that produced in the Standard solution (NMT 0.003%).
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