The residue is washed, extracted by dilute hydrochloric acid, and again well washed with boiling water.
Heated rather below 300° C. amber suffers decomposition, yielding an "oil of amber," and leaving a black residue which is known as "amber colophony," or "amber pitch"; this forms, when dissolved in oil of turpentine or in linseed oil, "amber varnish" or "amber lac."
This is obviously unsymmetrical, consisting of an aliphatic and an aromatic nucleus; Claus explained the formation of the same phthalic acid from the oxidation of either nucleus by supposing that if the aromatic group be oxidized, the aliphatic residue assumes the character of a benzene nucleus.
In 1861, while conducting a spectroscopic examination of the residue left in the manufacture of sulphuric acid, he observed a bright green line which had not been noticed previously, and by following up the indication thus given he succeeded in isolating a new element, thallium, a specimen of which was shown in public for the first time at the exhibition of 1862.
A heavy white precipitate, consisting of ammonium chloride and columbium nitride, is thrown down, and the ammonium chloride is removed by washing it out with hot water, when the columbium nitride remains as an amorphous residue (Hall and Smith, loc. cit.).
In former cases when the railways had had recourse to state aid, it was the state whose contributions were fixed, while the railways were left to find the residue; but on this occasion the position was reversed.
It is a brown powder which on heating in air loses sulphur and leaves a residue of the disulphide.
The residue is dissolved in alcohol and to the cold saturated solution a cold alcoholic solution of picric acid is added.
Stephen Girard had devised and bequeathed the residue of his estate for the establishment and maintenance of Girard College, in which no minister of the Gospel of any sect or denomination whatever should be admitted.
(1488), " two hundred persons were occupied and lived of their lawful labours, now there are occupied two or three herdsmen, and the residue fall into idleness "; therefore it is ordained that houses which within three years have been let for farms, with twenty acres of land lying in tillage or husbandry, shall be upheld, under the penalty of half the profits, to be forfeited to the king or the lord of the fee.
A fine oil of turpentine is distilled from the crude material; the residue forms a coarse resin.
Cotton seed cake or meal (the residue after the oil is extracted) is one of the most valuable of feeding stuffs, as the following simple comparison between it and oats and corn will show: 500 lb 400 lb 700 lb 200 lb 200 to 300 lb Cotton Cotton seed meal, though poor in carbohydrates, the fatand energy-supplying ingredients, is exceedingly rich in protein, the nerveand muscle-feeding ingredients.
The charge was distilled almost to dryness, though the operation was not carried far enough to cause the residue to " coke."
Transparent soaps are prepared by dissolving ordinary soap in strong alcohol and distilling off the greater portion of the alcohol till the residue comes to the condition of a thick transparent jelly.
The total alkali is determined by incinerating a weighed sample in a platinum dish, dissolving the residue in water, filtering and titrating the filtrate with standard acid.
Carbon bisulphide combines with primary amines to form alkyl dithiocarbamates, which when heated lose sulphuretted hydrogen and leave a residue of a dialkyl thio-urea, CS 2 +2R NH 2 - R NH CSS NH 3 RCS(NHR)2+H2S; or if the aqueous solution of the dithiocarbamate be boiled with mercuric chloride or silver nitrate solution, a mustard oil (q.v.) is formed, R.NH CSS NH3R+HgC12-Hg(R NH CSS)2->2RNCS-}-HgS+H2S.
The residue is then fused with caustic potash and nitre, dissolved in water, saturated with chlorine and distilled on the water-bath in a current of chlorine.
The insoluble residue contains a mixture of two sulphides, one of which is converted into the sulphate by nitric acid, whilst the other (a crystalline solid) is insoluble in acids.
It is necessary clearly to distinguish such compounds as the amino- (or amido-) acids and acid-amides; in the first case the amino group is substituted in the hydrocarbon residue, in the second it is substituted in the carboxyl group.
Dissolve the residue in hydrochloric acid and test separately for antimony and tin.
The residue from the ammonium sulphide solution is warmed with dilute nitric acid.
Any residue consists of black mercuric sulphide (and possibly white lead sulphate), in which mercury is confirmed by its usual tests.
The last two are dissolved out by cold, very dilute hydrochloric acid, and the residue is tested for nickel and cobalt.
The substance is heated with metallic sodium or potassium (in excess if sulphur be present) to redness, the residue treated with water, filtered, and ferrous sulphate, ferric chloride and hydrochloric acid added.
This theory explains the fluorescence of anthranilic acid (o-aminobenzoic acid), by regarding the aniline residue as the luminophore, and the carboxyl group as the fluorogen, since, apparently, the introduction of the latter into the non-fluorescent aniline molecule involves the production of a fluorescent substance.
The "residue" grant is expended on navigation and swimming classes.
The " phospho-glyco-proteids " resemble the mucins and mucoids in containing a carbohydrate residue, but differ in containing phosphorus.
Straw (from strew, as being used for strewing), is the general term applied to the stalky residue of grain-plants (especially wheat, rye, oats, barley).
The fifth, and last period - which, after all other expedients had failed, finally brought the residue of uncaptured and unsurrendered burghers to submission - was the final development of the blockhouse system, wedded to the institution of systematic. " driving " of given areas, which operations were in force until the 31st of May 1902, when peace was ratified at Pretoria.
He despatched French with a large force to clear the south-eastern districts of the Transvaal and for the rest maintained a force to watch De Wet, and organized a defence force in Cape Colony, while using the residue of his mounted men to sweep the country of stock, forage and inhabitants.
Strong sulphuric acid in contact with it liberates first nitric acid and later oxides of nitrogen, leaving a charred residue or a brown solution according to the quantity of acid.
If the sulphuric acid solution be evaporated to dryness the residue, after cooling, dissolves in cold water.
It is then separated in a centrifugal machine, the low melting-point impurities are removed by means of hot water, and the residue is finally hot-pressed.
The berries are dried in the sun and sent down to Hodeda or Aden, where they are subjected to a process for separating the husk from the bean; the result is about 50% of cleaned berries, bun safe, which is exported, and a residue of husk or kishr, from which the Yemenis make their favourite beverage.
From the alloy containing 25% of silicon, the excess of magnesium is removed by a mixture of ethyl iodide and ether and a residue consisting of slate-blue octahedral crystals of magnesium silicide is left.
All carbonates, except those of the alkali metals and of thallium, are insoluble in water; and the majority decompose when heated strongly, carbon dioxide being liberated and a residue of an oxide of the metal left.
Occasionally a knob or excrescence, formed by the residue of the glass beyond the point at which the base has been pinched together, remains as a silent witness of the process.
Columbium compounds are usually prepared by fusing columbite with an excess of acid potassium sulphate, boiling out the fused mass with much water, and removing tin and tungsten from the residue by digestion with ammonium sulphide, any iron present being simultaneously converted into ferrous sulphide.
Of the Kachins or Chingpaw were the Indo-Chinese race who, before the beginnings of history, but after the Mon-Annam wave had covered Indo-China, forsook their home in western China to pour over the region where Tibet, Assam, Burma and China converge, and that the Chingpaw are the residue left round the headquarters of the Irrawaddy and the Chindwin after those branches, destined to become the Tibetans, the Nagas, the Burmans and the Kuki Chins, had gone westwards and southwards.
It follows therefore that two hydrocarbon radicals are bound to the carbon monoxide residue with the same strength as they combine to form a paraffin.
A third hydroxyl group may be introduced into the - CH: 0 residue with the formation of the radical - C(OH) :0; this is known as the carboxyl group, and characterizes the organic acids.
Galway); while lectures are given at farmers' meetings by 1 This sum was furnished out of a total of £693,851, forming the residue grant allocated for the purposes of education to the various county councils of England and Wales under the Local Taxation (customs and Excise) Act 1890.