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 . rsenic, fixed salts, sulphuric acid, sulphurous acid, nitrous com-pounds, and chlorine. * The weight of a molecule is the sum of the weights of its atoms. CHLORIDES. 267 The official process for the preparation of hydrochloric acid isas follows: it may be carried out by the student with about one-twelfth of the quantities mentioned : — Take of chloride of sodium, dried, 48 ounces, sulphuric acid44
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 . rsenic, fixed salts, sulphuric acid, sulphurous acid, nitrous com-pounds, and chlorine. * The weight of a molecule is the sum of the weights of its atoms. CHLORIDES. 267 The official process for the preparation of hydrochloric acid isas follows: it may be carried out by the student with about one-twelfth of the quantities mentioned : — Take of chloride of sodium, dried, 48 ounces, sulphuric acid44 fluidounces, water 36 fluidounces, distilled water 50 fluidounces ;pour the sulphuric acid slowly into 32 ounces of the water, and,when the mixture has cooled, add it to the chloride of sodiumpreviously introduced into a flask having the capacity of at leastone gallon. Connect the flask by corks and a bent glass tube witha three-necked wash-bottle, furnished with a safety-tube, and con-taining the remaining 4 ounces of the water [or let the flask-tubepass loosely through a wider tube fixed in the cork of the wash-bottle, as shown in Fig. 37] ; then, applying heat to the flask, con-Fig. Preparation of Hydrochloric Acid. duct the disengaged gas through the wash-bottle into a second bottlecontaining the distilled water, by means of a bent tube dippingabout half an inch below the surface, and let the process be con-tinued until the product measures 36 ounces, or the liquid hasacquired a specific gravity of The bottle containing thedistilled water must be kept cool during the whole operation. The modification of wash-bottle shown in the figure allows of theeasy insertion or removal of a delivery-tube. The wider tube thereshown, or an ordinary tube-funnel, also acts as a safety-tube by ad-mitting air the moment there is any tendency in the water in thereceiver to be forced back on account *of a too rapid absorption ofthe gas. The time of the student will be saved if hyd
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