American journal of pharmacy . onducted by the tube in the capital, and its spiral leadencontinuation to one of the pans, where it is used to concen-trate a quantity of weak acid from the chamber. If theheat were further increased, the boiling point would sud-denly rise to 326° C. (619 F.,) and hydrated sulphuric acidwould distil over, which, of course, is not desirable. With reference to the quantity of lead taken up by sul-phuric acid in different stales of concentration, experimentshave lately been instituted by Anthon, which prove howvery objectionable the practice must be of concentrating
American journal of pharmacy . onducted by the tube in the capital, and its spiral leadencontinuation to one of the pans, where it is used to concen-trate a quantity of weak acid from the chamber. If theheat were further increased, the boiling point would sud-denly rise to 326° C. (619 F.,) and hydrated sulphuric acidwould distil over, which, of course, is not desirable. With reference to the quantity of lead taken up by sul-phuric acid in different stales of concentration, experimentshave lately been instituted by Anthon, which prove howvery objectionable the practice must be of concentrating theacid in leaden pans beyond the prescribed limits. Anthonfound in acid thus concentrated, and afterwards cooled 284 KNAPPS CHEMICAL TECHNOLOGY. down to 6S° F., the following quantities of sulphate oflead: Acid contained ^-^o^hs of sulphate of lead. u u u u u iT^o^^s The annexed wood cut (fig. 96) shows the manner in whichthe platinum still is erected in the concentrating house ofthe vitriol The high price of platinum vessels renders it very muchto the interest of the manufacturer that they should be inconstant use ; yet it is impossible to draw off so powerfulan acid at that temperature into the glass carboys in whichit is sent out, and leaden coolers cannot be used. Hencearises the necessity of the platinum syphons, figs, 97 and 98, KNAPPS CHEMICAL TECHXOLOGT. 285 Fig. 97.
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Keywords: ., bookcentury1800, bookdecade183, booksubjectpharmacy, bookyear1835
