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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![Sodii Chloridum (NaCl).—Native. [a] —In small, white crystalline grains, or transpa- rent cubic crystals, free from moisture ; has a purely saline taste ; imparts a yellow colour to flame : is soluble in water. (b) —The solution in water is not pptd. by Perclilor- ide of Platinum (PtCI^), (absence of Potas- sium Salts), but gives a white fiit. (AgCl) with Nitrate of Silver (AgNO,), soluble in Ammonia (Nil,HO), but insoluble in Nitric Acid (HNO3). Test of the Sodivni Salts—* All are soluble and give a yellow colour to the flame when heated on a loop of Platinum wire. This yellow colour is not visible whca looked at through blue glass. Stryclmia (C2,Hj,N.,0,) f (a)—In right, square octahedrons or prisms, colour- less and inodorous; sparingly soluble in water, but communicating to it its intensely bitter taste. Soluble in boiling Eectified Spirit and in Chloroform, but not in absolute Alcohol or in Ether. (h)—Pure Sulphuric Acid (PI.^SO,,) forms with it a colourless solution, which, on the addition of Bichromate of Potash (K^CrjO,), acquires an intensely violet hue, speedily passing tlirough red to yellow. (<••)—Not coloured by Nitric Acid (HNO3), but if Tests—-j Brucia be present the solution becomes red when heated. (r/)—Oxide of Lead PbO,„ added after H.,SO„ gives a play of colours from hlne to yefliiw. («)—In a similar way Fcrrocyanide of I'otassimn K,KeUy,,, changes the solution in H,SO, to vidlet. (/)—The Physiological Test—A few drops of the suspected liquid, injected under the skin of a young frog, if Strychnia bo present, rapidly cause tetanic convulsions and death. (//)—Leaves no Ash wlien burned with free accoss of ai r. ■* All the oflicial Soda Salts are devoid of colour.](https://iiif.wellcomecollection.org/image/b21507296_0509.jp2/full/800%2C/0/default.jpg)
