The British pharmacopoeia / published under the direction of the General Council of Medical Education and Registration of the United Kingdom, pursuant to the Acts XXI & XXII Victoria Cap. XC (1858) and XXV & XXVI Victoria Cap. XCI (1862), 1898.

General Medical Council.

Date:: 1898

Credit: The British pharmacopoeia / published under the direction of the General Council of Medical Education and Registration of the United Kingdom, pursuant to the Acts XXI & XXII Victoria Cap. XC (1858) and XXV & XXVI Victoria Cap. XCI (1862), 1898. Source: Wellcome Collection.

Provider: This material has been provided by King’s College London. The original may be consulted at King’s College London.

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$hydroxides and carbonates, in hydrochloric acid, and in mixtures of that acid and water. Its aqueous solution, which is odourless, tasteless, and faintly acid to litmus, gives with Ic£sjm C>wu oh ^'^'^^^^ of silver ammonia-nitrate a canary-yellow precipitate ^r^'<x.jj,a^^ readily dissolved by solution of ammonia and by nitric acid. -»bNH^i\(o.^-*>Hao Sprinkled on ignited charcoal, it emits an alliaceous odom-. It is volatiUsed at 400° F. (204-4° C). 0-25 gramme, dis- solved quickly in boiling loater with five times its weight of sodium bicarbonate, should, after the cooled solution is well shaken with three successive drops of hydrochloric acid, dis- charge the colour of 60'8 to 50'9 cubic centimetres of the volumetric solution of iodine^ It should yield no characteristic reaction with the tests for lead, cadmium, antimony, tin, or sulphides. It should dissolve completely in sohition of ammonia, and the resulting liquid when diluted with an equal volume of toater and acidulated with hydrochloric acid should not have a yellow colom- (absence of arsenious sulphide). Dose.—to Ta grain. AOIDUM BBNZOIOUM.,^ ^ <W Benzoic Acid, ' Benzoic Acid, Cells-COOH, is obtained from benzoin by sublimation. It may also be obtained from toluene, from .jt hippuric acid, and from other organic compounds. Characters and Tests.—In light feathery crj'staUine plates and needles, which are flexible, nearly colom-less, and odourless when quite pure ; but when obtained from benzoin possess an agreeable aromatic odom*, due to traces of other substances. It is soluble in 400 parts of cold or 17 parts of boihng water, in its own weight of absolute alcohol, in 3 parts of alcohol (90 per cent.), in 2-5 of eth^r, in 7 of chloroform, and in the fixed and volatile oils; also in solu- tions of the alkahs and of calcium hydroxide, forming benzoates, and it is precipitated from these on the addition of hydrochloric acid unless the solutions are very dilute. It volatilises in the vapour of water. Pm-e benzoic acid melts at 260-5° F. (121-4° C.) and boils at 480-2° F. (249° C.); but when obtained from benzoin, it melts at about 248° F. (120° C), forming a yellowish liquid which becomes$