An introduction to practical chemistry : including analysis . of the crystallized salt (,CO2+10Aq). For this purpose weigh out 100 grains ofthe salt, and dissolve it withthe aid of a gentle heat, inabout four ounces of water inan evaporating basin. Poura little of the standard sul-phuric acid (specific gravity1-1268) (which should havebeen previously prepared andallowed to cool,)1 into a lip-ped glass, and thence into thealkalimeter tube, until itreaches the line marked car-bonate of soda, and fill it withdistilled water up to two or three small piecesof litmus and turmeric paperi
An introduction to practical chemistry : including analysis . of the crystallized salt (,CO2+10Aq). For this purpose weigh out 100 grains ofthe salt, and dissolve it withthe aid of a gentle heat, inabout four ounces of water inan evaporating basin. Poura little of the standard sul-phuric acid (specific gravity1-1268) (which should havebeen previously prepared andallowed to cool,)1 into a lip-ped glass, and thence into thealkalimeter tube, until itreaches the line marked car-bonate of soda, and fill it withdistilled water up to two or three small piecesof litmus and turmeric paperinto the alkaline solution,which should be kept gentlyheated over a lamp, and have Sulphuric acid of the specific gravity 1*1268, may be prepared bymixing together one part by measure of strong oil of vitriol (HO,S03)specific gravity I84, and eight parts of distilled water. Before takingit into use, it must be tested both as to its specific gravity, and also asto its neutralizing power, which must be ascertained by experiment wita pure specimen of alkali. 7*. 78 ALKALIMETRY. at hand a glass rod to stir it with during the processof neutralization. 163. Having made these preparations, take the tubein the left hand, close the opening tightly with thethumb, and invert the instrument five or six times suc-cessively, in order to mix the acid and water thoroughlyand uniformly together: then by cautiously relaxingthe thumb, allow the acid to fall drop by drop into thealkaline solution, stirring the latter constantly with theglass .rod until the litmus begins to turn feebly red.(Fig. 63.) When the change of color begins to appear,wash the sides of the basin by gently agitating theliquid in it, in order to dissolve any of the splashingsthat may have dried during the process, and escaped theaction of the acid. When the point of neutralizationis nearly attained, bring one of the pieces of litmus-paper from time to time out of the solution against theheated side of the basin ; if the redness
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectchemistry, bookyear18
