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 . y pure solublecarbonate is placed in the flask, a little water added, a minia-ture test-tube containing sulphuric acid lowered into the flaskby a thread and supported so that the acid may not flow out,the cork inserted, the outer end of the piece of the straightglass tube closed by a fragment of cork or wrax, and the wholeweighed. The apparatus is then inclined so that the oil ofvitriol and carbon
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 . y pure solublecarbonate is placed in the flask, a little water added, a minia-ture test-tube containing sulphuric acid lowered into the flaskby a thread and supported so that the acid may not flow out,the cork inserted, the outer end of the piece of the straightglass tube closed by a fragment of cork or wrax, and the wholeweighed. The apparatus is then inclined so that the oil ofvitriol and carbonate may slowly react; carbonic acid gas isevolved and escapes through the horizontal tube, any moisturebeing retained by the chloride of calcium. When efferves-cence has ceased, the gas still remaining in the vessel is suckedout ; this is accomplished by adapting a piece of India-rubbertubing to the end of the drying-tube, removing the small plugfrom the straight tube, and aspirating slowly with the mouthfor a few minutes. If the heat produced by the action of oilof vitriol and solution is considered insufficient to expel all thecarbonic acid from the liquid, the plug is again inserted in the. 592 QUANTITATIVE ANALYSIS. tube and the contents of the flask gently boiled for some the apparatus is cold, more air is again drawn through it,and the whole finally weighed. The loss is due to carbonicacid gas (C02), from the weight of which that of any carbon-ate is ascertained by calculation. Carbonates insoluble inwater may be attacked by hydrochloric instead of sulphuricacid ; granulated mixtures of carbonates and powdered tartaricor citric acids by inclosing the preparation in the inner tubeand placing water in the flask, or vice versa. The apparatusalso may be modified in many ways to suit the requirements,convenience, or practice of the operator. Process 2 Carbonates from which carbonic acid gas is evolved by heat may be estimated by the loss they experienceon ignition
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