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Clear, colorless, mobile volatile liquid; odor - characteristic and spirituous; taste - burning. Volatilizes readily, even at low temperatures, and boils at 78°C. Flammable.

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Alcohol (95%) is a mixture of ethyl alcohol and water. It contains not less than 92.0% w/w and not more than 92.7 w/w ethyl alcohol, corresponding to not less than 94.7% v/v and not more than 95.2% v/v at 15.56°C.

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To 20 ml, add 5 drops of phenolphthalein solution. The mixture remains colorless, and requires not more than 0.2 ml of 0.1N sodium hydroxide to produce a pink color.

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Dilute 5 ml to 100 ml with water in a glass cylinder. The solution remains clear when examined against a black background. Cool to 10°C for 30 minutes; the solution remains clear.

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To one drop of alcohol add one drop of water, one drop of dilute phosphoric acid, and one drop of potassium permanganate solution. Mix, allow to stand for one minute, and then add sodium bisulphite solution dropwise, until the permanganate color disappears. If a brown color remains, add one drop of dilute phosphoric acid. To the colorless solution, add 5 ml of freshly-prepared chromotropic acid solution, and heat on a water bath at 60°C for 10 minutes. No violet color should be produced.

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Clean a glass-stopped cylinder thoroughly with hydrochloric acid, rinse with water, and finally rinse with the alcohol under examination. Put 20 ml in the cylinder, cool to about 15°C, and then add from a carefully-cleaned pippette 0.1 ml of 0.1N potassium permanganate. Mix at once by inverting the stoppered cylinder, and allow to stand at 15°C for 5 minutes. The pink color should not disappear entirely.

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To 1 ml add 3 ml of water and 10 ml of mercuric sulphate solution, and heat in a boiling water bath. No precipitate should be formed in 3 minutes.

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Heat 100 ml of hydroxylamine hydrochloride solution in a loosely-stoppered flask on a water bath for 30 minutes. Then cool, and if necessary, add sufficient 0.05N sodium hydroxide to restore the green color. To 50 ml of this solution add 25 ml of the alcohol, and heat on a water bath for 10 minutes in a loosely-stoppered flask. Cool, transfer to a Nessler cylinder, and titrate with 0.05N sodium hydroxide, until the color matches that of the remainder of the hydroxylamine hydrochloride solution contained in a similar cylinder, when both solutions are viewed down the axis of the cylinder. Not more than 0.9 ml of the 0.05N sodium hydroxide should be required in the titration.

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Mix 10 ml with 5 ml of water and 1 ml of glycerin, and allow the mixture to evaporate spontaneously from clean, odorless, absorbent paper. No foreign odor should be perceptible at any stage of the evaporation.

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