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acetic acid acetone action alcoholic solution alkali ammonia ammonium analysis anhydride aqueous solution barium benzene boiling bromine calcium camphoric carbon disulphide cent CH₂ chloride chloroform CO₂ cold colour colourless compound concentrated containing COOH cooling crystallises crystals decomposed decomposition derivative dextrin dilute dioxide dissolved distillation dried ethereal salt ethylic salt evaporated excess experiments flask formed formula fractions gave grams H₂O heated hydrochloric acid hydrogen hydrogen bromide hydrogen chloride hydrolysis hydroxide hydroxylamine hyponitrite insoluble iodide isomeric lactone light petroleum liquid malate maltodextrin maltose melting point method mixture needles nitric acid nitrite nitrocamphor nitrogen nitrous obtained oxide oxidised oxygen peroxide phosphorus potash potassium precipitate prepared prisms reaction reduced requires residue rotation rotatory power separated silver hyponitrite silver nitrate silver salt small quantity sodium sodium amalgam sodium carbonate solvent sparingly soluble still-head substance sulphate sulphuric acid tartrate temperature Trans tube vapour washed water-bath whilst yellow yield
Page 679 - In choosing or constructing a still-head, the first point to be considered is its efficiency in separating the components of a mixture. It frequently happens, however, that the quantity of liquid available is small and, in any case, when a series of fractional distillations has to be carried out, some of the fractions eventually become very small : in 'such a case, of two still-heads of equal efficiency, that one is the more useful which allows of the distillation of the smaller quantity of liquid....
Page 703 - The weight of liquid and vapour in the still-head was more than twice as great as in those of Glinsky or Young and Thomas. 4. Flow of Liquid through the Reflux Tubes. — It is of the utmost importance that there should be a rapid flow of condensed liquid through the reflux tubes, especially if they- are outside the main tube and are not heated by the ascending vapour. To take an extreme case, suppose that there were no back flow at all through the reflux tubes and that the traps simply became filled...
Page 106 - ... published, show that nitric oxide may serve as a carrier of atmospheric oxygen to silver nitrite ; and it is therefore most probable that in this case also some of the nitric oxide liberated serves to carry a little oxygen to the still undecomposed new silver-salt. During its decomposition by heat it does not fuse or exhibit any other change except that from a bright yellow to a silver-white colour. After a red heat nothing remains but pure silver. 5. The following determinations of the amount...
Page 536 - ... dissolved in nitric acid, the solution evaporated to dryness, and the residue repeatedly moistened with water and dried again by heat.
Page 828 - Ginster, Ger.) is found in the pastures, thickets, and waste places throughout Central and Southern Europe, across Russian Asia to the Baikal, and northward to Southern Sweden. It is frequent in the greater part of England, but rare in Ireland and Scotland. The fact that it contains a yellow colouring matter is recorded by numerous writers, and the following embody the principal references to the dyeing and general properties of the plant : Bancroft (Philosophy of Permanent Colours...
Page 693 - B, of 7-5 to 8 mm. internal diameter and 60 mm. long, open at each end and widened below into the form of a funnel which rests on the constricted part of A and...
Page 693 - The whole of the liquid condensed in the still-head above any section collects together and flows down the walls until it falls in drops from the depression, E, into the funnel. From this it falls on to the top of the middle tube and spreads itself over its surface, falling again in drops from the bottom of this tube, and finally passing between the bottom of the inner tube and the constriction in the outer one on which the inner tube rests, and thus into the section below. There is no...
Page 697 - The upper and wider part of the reflux tube has an internal diameter of 4'5 mm., the narrow, U-shaped part, which serves as a trap, an internal diameter of 3 mm. ; if, however, the number of constrictions exceeds 10 or 12, the traps for the lower reflux tubes should be slightly wider, say 3 '5 mm.