Chemistry : general, medical, and pharmaceutical including the chemistry of the ; a manual on the general principles of the science, and their applications in medicine and pharmacy . length of the tube. The part of the tube just abovethe asbestos is now softened in the blowpipe-flame and drawnout about a decimetre to the diameter of a narrow quill; itis again drawn out to the same extent at a point about twoor three centimetres nearer the mouth, and any excess of tub-ing cut off. The bulb thus formed may be enlarged by soften-ing and blowing. The tube is next softened at a poi
Chemistry : general, medical, and pharmaceutical including the chemistry of the ; a manual on the general principles of the science, and their applications in medicine and pharmacy . length of the tube. The part of the tube just abovethe asbestos is now softened in the blowpipe-flame and drawnout about a decimetre to the diameter of a narrow quill; itis again drawn out to the same extent at a point about twoor three centimetres nearer the mouth, and any excess of tub-ing cut off. The bulb thus formed may be enlarged by soften-ing and blowing. The tube is next softened at a point closeto but anterior to the asbestos, and bent to form an obtuseangle ; the tube is then softened close to the bulb and slightlybent so that the bulb may be parallel with the large tube; then 49* 582 QUANTITATIVE ANALYSIS. softened on the other side of the bulb, and the terminal tubebent to an obtuse angle, so that, the tube being held in a hori-zontal position, the bulb may be sunk in water, and the terminaltube point upwards (Fig. 80). The long tube is now laid inthe gas-furnacefound in most laboratories (Fig. 81), a basinso placed that the bulb of the apparatus may be cooled by Fig. Distillation of Mercury for Quantitative Purposes. being surrounded by water, the part of the tube occupied byasbestos heated to redness, and the flame slowly lengthened untilthe whole tube is red-hot. Under the circumstances justdescribed the mercurial compound volatilizes, is decomposed bythe lime, and its acidulous radical fixed, the mercury carried toand condensed in the bulb, the carbonic acid gas evolved fromthe bicarbonate of sodium and chalk washing out the last por-tions of mercury-vapor from the tube. When the distillationis considered to be complete, the dish of water is removed, thebulb dried, and then detached by help of a file at a pointbeyond any sublimate of mercury. The bulb is lastly weighed,the mercury shaken, or dissolved out, and the tube again driedand weighed. P?*oc
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