Elements of chemistry, in two volumes / by John Murray.

  • Murray, John.
Date:
1828
Catalogue details

Licence: Public Domain Mark

Credit: Elements of chemistry, in two volumes / by John Murray. Source: Wellcome Collection.

    61/768 (page 49)
    very soluble in water, and not easily crystallizable.—Hy- driodate of Potash. This salt is very soluble in water; when dried it is decomposed, like the other hydriodates, and is converted into iodide of potassium, which is fused and volatilized at a red heat.—Iodate of Potash is solu- ble and crystallizable; it deflagrates when thrown on burn- ing fuel. From the numerous and powerful chemical actions which potash exerts, it is applied to many purposes of utility in the arts; and as it is the alkali most easily procured, it is the one most extensively used. It is thus employed in bleaching, dyeing, soap-making, the manufacture of glass, and others. In medicine it is employed as an antacid, a lithontriptic, and an escharotic. Besides being produced in the vegetable, it is found in the mineral kingdom, either as a saline combination, or as an ingredient in some earthy fossils. It also exists in se- veral of the animal fluids and solids. The equivalents of the compounds of potassium and of potash, and the proportions of the constituents according to their different combining weights, in reference to hy- drogen as 1, will be found in the following table : COMPOUNDS OF POTASSIUM. \ . Potassium, 1 atom = 40. Weight of the other body. Atomic Weight of the com. pound. Chloride, 40 36 76 Hydruret ? 40 1 41 Iodide, 40 124 164 Oxide, (Potash), 40 8 48 Peroxide, 40 24 64 Phosphuret 40 12 52 Subphosphuret 80 (2 at.) 12 92 Sulphuret, 40 ^ 16 56 Bi-sulphuret, 40 32 72 Tritosulphuret, .. 40 48 88 Quadrosulphuret, . 40 64 104 Persulphuret, 40 80 120 VOL. II. D