A Manual of Analytical Chemistry ...T. Tegg, 1831 |
Other editions - View all
Common terms and phrases
acid solution alcalies alumina analysis antimony aqua regia arsenic acid barytes BERZELIUS bihydrosulphuret of ammonia blowpipe boiled bulb carbonate of ammonia carbonate of potash carbonic acid caustic ammonia caustic potash chloride chloride of silver colour compound converted decomposed decomposition deutoxide of copper diluted disengaged dissolved employed excess filtered solution flask fluoride glass tube heat ignited insoluble lime liquid sulphuretted hydrogen magnesia manganese manner mercury metallic oxides method mixture muriate of ammonia muriatic acid nitrate nitric acid operator oxide oxide of chromium oxide of cobalt oxide of nickel oxidised peroxide of iron peroxide of tin phosphate phosphoric acid phuret platinum crucible portion Potash produces produces in solutions protoxide of lead protoxide of manganese reagents selenious acid separated silicic acid small quantity solu soluble in water solution filtered solution of Carbonate solution of chloride strontian substance sulphate of barytes sulphuretted hydrogen gas sulphuric acid tion titanic acid treated volatile washed white precipitate
Popular passages
Page 93 - ... oxide of nickel washed with hot water, ignited, and weighed ; the oxide of cobalt in the filtrate is precipitated by sulphide of ammonium. The reason why it is necessary to dilute the solution of the two oxides with water, free from atmospheric air, is, that oxide of cobalt in an ammoniacal solution is converted into peroxide of cobalt, which, precipitating as a black powder, would contaminate the oxide of nickel. The more dilute the solution is, the less easily does the oxide of cobalt become...
Page 50 - The spirit passes from aa into 6 through the pipe fr, which forms the only communication between the spirit holder and the box which holds the wick. The object of this contrivance is to prevent the explosion which frequently takes place when the common spirit lamps are inflamed, and which is owing to the inflammation of the mixture of atmospheric air and vapour of alcohol which forms in the spirit holder o «. At m is an opening by which the spirit is poured into the lamp.
Page 134 - ... are exposed to heat, while still moist, and roasted as long as they give off sulphurous acid; they are thereby converted into basic sulphates of oxides. These salts are dissolved in hydrochloric acid, the solution is mixed with chloride of potassium and nitric acid, and then evaporated to dryness. The dark saline mass thus produced contains chloride of potassium, chloride of copper and potassium, and chloride of palladium and potassium. The first two of these salts are to be extracted by alcohol,...
Page 154 - ... dissolve iron, and the black undissolved portion is collected on a filter, ignited with exposure to air, and weighed ; its weight deducted from that of the peroxide of iron, previously obtained, leaves the quantity of the latter in a pure state. The solution, filtered from the precipitate by ammonia, is mixed with carbonate of soda in sufficient quantity to decompose the anmioniacal salts, and evaporated to dryness.
Page 168 - The mineral, finely pulverised, was ignited in a platinum crucible with from three to four times its weight of carbonate of soda ; the ignited mass moistened with water, and the soluble portion filtered from the inS
Page 146 - The ore must not be ignited until it has previously been weighed ; for during the ignition it generally acquires a coating of peroxide of iron, and a consequent increase of weight. It is sufficient to dry it upon a hot sand-bath. The operator must not employ too large a quantity of the ore for analysis. Berzelius thinks about 30 grains is the best quantity. Sometimes, however, when the object is to determine with great accuracy the quantity of a constituent which occurs, but in a very small relative...
Page 50 - The wick passes between two cylinders, which are connected below by a horizontal plate, and are raised or depressed by means of the toothed wheel e and the toothed bar g. The lower end of the latter is connected with a cross bar, upon the end of which is fastened a ring whereon the wick is stuck. The cross bar works up and down in the box b. This box does not form part of the spirit-holder a, as it does in the common lamps, but is separated from it by the open spaces t t.
Page 314 - ... different, since each of these minerals contains several elementary substances, and since they are not soluble in acids. In order, therefore, to bring them into a state of solution, we take a given quantity, 50 or 100 grains for instance, of one of them, previously reduced to very fine powder, and fuse it in a platinum crucible, with three or four times its weight of alkali, which, uniting with one or more of the constituents of the mineral, effects its decomposition. The fused mass is now soluble...
Page 375 - For example, water is formed of oxygen and hydrogen gases in the proportion of two volumes of the former to one volume of the latter. Now...
Page 128 - Before the blowpipe, mixed with carbonate of soda, and heated in a glass tube, metallic mercury sublimes in the form of a grey powder, which, on being rubbed with a glass rod, is resolved into globules.