Analytical reagents : standards and tests / compiled by Edmund White.

Date:
1911
Catalogue details

Licence: In copyright

Credit: Analytical reagents : standards and tests / compiled by Edmund White. Source: Wellcome Collection.

    19/194 (page 9)
    Tests. Residue : 20 mils should leave no residue on evaporation over a water-bath. Reaction : Should be neutral to litmus. Organic Impurities : Tinted faintly pink by the addition of permanganate, the colour should not be discharged in from five to ten minutes Trade Varieties. Acetone is widely used technically ias a solvent, and can usually 'be obtained fairly pure. It 'has usually been puri- fied by fractional distillation, and the fractions boiling above 60° constitute what is known as “ acetone oil.” This consists chiefly of higher homologous ketones, and is so called because it is not miscible freely with water like pure acetone. Acetone oil finds a use as a solvent in the varnish industry. ALCOHOL, AMYL. C5Hn0H. .Specific .gravity, 0'814 'to 0'815 ; boiling-point, 128°-132°. Soluble in about 40 parts of water; miscible with benzene or petroleum e their. Tests. Residue : 10 mils leaves no residue after evaporation in a glass dish over a water-bath. Furf urol: Not more than a pale yellow or reddish-brown tint should be produced by shaking it with an equal volume of strong sulphuric acid. Trade Varieties. Fusel oil is commonly known as “ commercial ” amyl aloohol, but is a most variable mixture of both lower and higher homologues with water. Fusel oil on distillation yields first a watery fraction containing some of the lower homologues in solution. ALCOHOL, ETHYL. c2h5oh. Specific gravity, 0796; boiling-point, 78'3°. Miscible with water in all proportions. Colourless. Very hygro- scopic. When mixed with water a oontmotion occurs, the maximum contraction being Shown by a mixture in the pro- portion of one molecular weight of aloohol and three molecu- lar weights of water. Tests. Residue : Should leave no residue on evaporation. Odour: Should give no foreign odour when allowed to evaporate from white filter paper, or on dilution with water. Aldehyde: If ,a few drops of silver nitrate solution be added to 10 mils of the .aloohol, and the mixture warmed and set