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 . itself. The water produced when the pre-pared tube is heated, is collected in a small U-tube containingpieces of chloride of calcium, or pumicestone moistened withsulphuric acid (Fig. 86) ; the carbonic acid gas in a series ofbulbs (Fig. 86) containing solution of potash (sp. gr. ). These bulbs may be purchased at any chloride-of-calcium tube is fitted by a good cork to
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 . itself. The water produced when the pre-pared tube is heated, is collected in a small U-tube containingpieces of chloride of calcium, or pumicestone moistened withsulphuric acid (Fig. 86) ; the carbonic acid gas in a series ofbulbs (Fig. 86) containing solution of potash (sp. gr. ). These bulbs may be purchased at any chloride-of-calcium tube is fitted by a good cork to thecombustion-tube, the potash-bulbs by a short piece of India-rubber tubing to the chloride-of-calcium tube. • The potash-bulbs may carry a short light tube containing a rod of causticpotash three or four centimetres long ; this serves to arrest anymoisture that might be carried away from the solution of pot- CARBON, HYDROGEN, OXYGEN, NITROGEN. 599 ash by the dried expanded air which escapes during the opera-tion. The combustion-tube having been placed in the furnace,and the drying-tube and potash-bulbs weighed and attached,the gas is lit under the asbestos, and, when the tube is red-hot,. fr-feSfeWiawMg^ Chloride-of-calcium Tubes, and Potash-bulbs. the flame slowly extended until nearly the whole tube is at thesame temperature, the operation being conducted at such arate that bubbles of gas escape through the potash-bulbs atabout the rate of one per second. When no more gas passes,the extremity of the tube containing the chlorate of potassiumis gently heated until oxygen ceases to be evolved; the quilledextremity of the combustion-tube is then broken, and air,dried and freed from carbonic acid, drawn slowly through theapparatus by suction through an India-rubber tube fixed onthe free end of the potash-bulbs; perfect combustion of carbonand removal of all carbonic acid gas are thus insured. Thedrying-tube and bulbs are disconnected and weighed, the in-crease in weight due t
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Keywords: ., bookcentury1, bookdecade1870, booksubjectpharmaceuticalchemistry
