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Chemical Re-Agents, Or Test; And Their Application in Analyzing Waters ...
Sin vista previa disponible - 2018
acid gas action added alcohol alkali alumina ammonia analysis antimony arsenic ascertain barytes becomes bismuth blowpipe blue colour boiling bottle carbonate of lime carbonate of potash carbonic acid carbonic acid gas chemical chloride cipitate combined compound contain copper decomposed detecting digested dissolved distilled water Ditto dried drops dryness earths employed evaporated excess exposed ferrocyanate of potash filter fluid flux fused glass gold grains half a test-tubeful insoluble liquid ammonia liquor litmus magnesia manganese mercury metallic mineral waters mixture muriate of ammonia muriate of soda muriatic acid nitrate nitrate of silver nitric acid obtained oxalate oxide of iron paper peroxide phate pitate platinum portion powder preci precipitate present produced protoxide re-agent red heat residue salt separated silica soil solu soluble solution strontia substance sulphate sulphate of lime sulphuric acid tained test-tubeful of distilled tincture tion tube turbid washed weight white precipitate yellow zinc
Página 320 - ... the one usually employed by chemical philosophers for the analysis of stones. 8. If any saline matter, or soluble vegetable or animal matter, is suspected in the soil, it will be found in the water of lixiviation used for separating the sand. This water must be evaporated to dryness in a proper dish, at a heat below its boiling point If the solid matter obtained is of a brown colour and inflammable, it may be considered as partly vegetable extract If its smell, when exposed to heat, be like that...
Página 312 - ... earthy, animal, or vegetable matter, will remain in a state of mechanical suspension for a much longer time ; so that by pouring the water from the bottom of the vessel, after one, two, or three minutes, the sand will be principally separated from the other substances, which, with the water containing them, must be poured into a filter, and after the water has passed through, collected, dried, and weighed.
Página 319 - ... the weights of the oxides ascertained after they have been heated to redness will denote their quantities. Should any magnesia and lime have escaped solution in the muriatic acid, they will be found in the sulphuric acid ; this, however, is rarely the case ; but the process for detecting them, and ascertaining their quantities, is the same in both instances. The method of analysis by sulphuric acid, is sufficiently precise for all usual experiments ; but if very great accuracy be an object, dry...
Página 310 - The weights of the vegetable fibres or wood, and of the gravel and stones, should be separately noted down, and the nature of the last ascertained ; if calcareous, they will effervesce with acids ; if siliceous, they will be sufficiently hard to scratch glass ; and if of the common aluminous class of stones, they will be soft, easily cut with a knife, and incapable of effervescing with acids.
Página 310 - ... the bottom of the dish ; as long as the colour of the wood remains unaltered the heat is not too high, but when the wood begins to be charred the process must be stopped. A small quantity of water will perhaps remain in the soil, even after this operation, but it always...
Página 311 - ... 3. The greater number of soils, besides gravel and stones, contain larger or smaller proportions of sand of different degrees of fineness ; and it is a necessary operation, the next in the process of analysis, to detach them from the parts in a state of more minute division, such as clay, loam, marie, vegetable and animal matter, and the matter soluble in water.
Página 328 - Vegetable or animal matters, when finely divided, not only give coherence, but likewise softness and penetrability; but neither they nor any other part of the soil must be in too great proportion ; and a soil is unproductive if it consist entirely of impalpable matter.
Página 329 - Fahrenheit. Plants and trees, the roots of which are fibrous and hard, and capable of penetrating deep into the earth, will vegetate to advantage in almost all common soils that are moderately dry, and do not contain a very great excess of vegetable matter.
Página 310 - ... 2. None of the loose stones, gravel, or large vegetable fibres should be divided from the pure soil till after the water is drawn off: for these bodies are themselves often highly absorbent and retentive, and, in consequence, influence the fertility of the land. The next process, however, after that of heating, should be their separation, which may be easily accomplished by the sieve, after the soil has been gently bruised in a mortar. The weights...
Página 254 - Add to the water thus concentrated a saturated solution of muriate of barytes, as long as any precipitation is produced, taking care to avoid adding an excess. By a previous experiment, let it be ascertained whether this precipitate effervesces or not with diluted muriatic acid, and whether it is entirely dissolved. If it is, the precipitate is of course carbonate of...