Elements of pharmacy, materia medica, and therapeutics. / By William Whitla.
- William Whitla
- Date:
- 1882
Licence: Public Domain Mark
Credit: Elements of pharmacy, materia medica, and therapeutics. / By William Whitla. Source: Wellcome Collection.
Provider: This material has been provided by The University of Leeds Library. The original may be consulted at The University of Leeds Library.
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![Its solution in water gives with Mucilage of Starch, and a few drops of Solution of Chlorine, a hhw colour. (c)—The addition of Tartaric Acid to its solution in water, mixed with Mucilage of Starch, does not develope a bliu< colour {aYjaence of lodate of Potassium). rpgg^g / (d)—Solution of Nitrate of Silver (AgNO^), added in excess, forms a yellowisli-whitc 2U^t. which, when shaken with Ammonia, yields by sub- sidence a clear solution, in which excess of Nitric Acid (HNO3) causes no turbidity (absence of Chloride of Potassium). —Its solution in water is only faintly pptd. by the addition of Saccharated Solution of Lime (absence of Carbonate of Potash). General Tests of the Potassium. Salts—* (a)—Change ?-ed litmus paper blue. (i)—Give a crystalline ppt (HKC H,0,] with Tar- taric Acid (H„C^H,0,). (c) —Give a yellow ppt. (2KC1 + PtClJ with Per- chloride of Platinum (PtClJ. (d) —Give a violet colour to the blowpipe flame, easily seen when viewed through blue glass ; while the yellow colour produced by Sodium Salts in the blowpipe flame cannot be seen through \ blue glass. Quiniffi Sulphas (C«,H„N„0,),H S0^7H,0.) ^(«)—In filiform, silky, snow-white crystals, of a pure intensely bitter taste; sparingly soluble in water, yet imjiartiug to it a peculiar bluish tint. ' (b)—The solution gives with Chloride of B.arium Tksts—(BaCl.^) ■A whitr j)]>t. (Sulphate of Barium— BaSO j, insoluble in Nitric Acid (HNOJ. and when treated with Solution of Chlorine, and afterwards with Solution of Ammonia, it becomes of a splendid cnuTahl green colour, (thalleiochinc is produced). Tests— 8.^3 •'Vll the official rotassiimi Salts are colourless except the B chromatc f/ri/J, the two I'nissiates rni ami yellow), the Permanganate (piirph ), aiul the Sulphnruteil (irhich is iitvr greni).](https://iiif.wellcomecollection.org/image/b21507296_0504.jp2/full/800%2C/0/default.jpg)
