. The Pharmaceutical era. Fig. 9.—Bending Glass Fig. 10.—Properly and Improperly Bent Tubes. is Litmus Paper, a bibulous paper colored with vegetablecoloring matter known as Litmus. To take the reaction of a liquid, a small portion ispoured into a watch crystal and two small pieces of lit-mus paper, one blue and one red, are dropped into it. Ifthe blue piece turns red, the liquid is acid; if the redpiece turns blue, it is alkaline. If neither changes color,the reaction is neutral. Another valuable indicator is a solution of Pheuol-phthalein in alcohol. A few drops of this turns an alk
. The Pharmaceutical era. Fig. 9.—Bending Glass Fig. 10.—Properly and Improperly Bent Tubes. is Litmus Paper, a bibulous paper colored with vegetablecoloring matter known as Litmus. To take the reaction of a liquid, a small portion ispoured into a watch crystal and two small pieces of lit-mus paper, one blue and one red, are dropped into it. Ifthe blue piece turns red, the liquid is acid; if the redpiece turns blue, it is alkaline. If neither changes color,the reaction is neutral. Another valuable indicator is a solution of Pheuol-phthalein in alcohol. A few drops of this turns an alka-line solution to purplish red. With acids the solution iscolorless. Like litmus, it is also to be had in the formof paper. Collecting and Washing Precipitates. —One of the mostfrequent reactions which will occur during the subse-quent studies will be the appearance of a solid precipi-tate following upon the mixture of two or more frequently it will be necessary fo obtain this pre-cipitate free from the liquid in which it is formed.
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Keywords: ., bookcentury1800, booksubjectdrugs, booksubjectpharmacy, bookyear1
