CHE M I S T R V. 



rntt more styptic in its taste thin sulphureted sulphite. 

 It it let* soluble in water, and insoluble in alcohol. 

 Chenmtry. when CX p Ose d to the air, it is speedily converted into 

 sulphate. 



Sp. 5. Phosphate of Zinc. Thii salt doei not 

 crystallize, but yields, when evaporated, a mass like 

 gum arabic. 



Sp. 6. Carbonate of Zinc. This salt may be ob- 

 tained, by precipitating sulphate of zinc by an alka- 

 line carbonate. It occurs native, and is known by 

 the name of calamine. It is composed of one part acid, 

 and two parts oxide. 



Sp. 7. Finale of Zinc. This salt is soluble in wa- 

 ter, and does not crystallize. 



Sp. 8. Borate of Zinc. A white powder insoluble 

 in water. 



Sp. 9. Acetate of Zinc. Acetic acid readily dis- 

 solves zinc. The salt crystallizes in rhomboidal or 

 hexagonal plates of a talky appearance. Its taste is 

 bitter and metallic. It is soluble in water, and not 

 altered by exposure to the air. On live coals it burns 

 with a blue flame. 



Sp. 10. Succinate of Zinc. Foliated crystals 

 scarcely examined. 



Sp. 11. Benzoale of Zinc. Needle-shaped crys- 

 tals soluble in water and alcohol. 



Sp. 12. Oxalate of Zinc. A white powder scarce- 

 ly soluble in water. 



Sp. 13. Citrate of Zinc. Small brilliant crystals 

 insoluble in water. 



Sp. 14. Arteniale of Zinc. A white powder in- 

 soluble in water. 



The tungstate, molybdate, and chrotnate of "zinc, 

 are also insoluble in water. The first two are white, 

 the last orange red. 



GENUS XV. Sails of Bismuth. 



Xalti of This genus of salts has been but imperfectly cx- 



bionutli. amined. The solutions of them are usually colour- 

 less, and when water is added to them, a white pow- 

 der precipitates unless there be a considerable excess 

 of acid present. Prussiate of potash occasions a white 

 precipitate, hydrosulphuret of potash a black pre- 

 cipitate, and infusion of nutgalls an orange precipi- 

 tate, when poured into these solutions. 



Sp. 1. Nitrate of Bismuth. Nitric acid attacks 

 bismuth with great violence. The solution is colour- 

 less, and deposites small white crystals, which are 

 four-sided prisms. They attract a little moisture in 

 the air. They detonate feebly on burning coals, 

 loudly when triturated with phosphorus. When dis- 

 solved in water they are decomposed, and a white 

 powder, which is a subnitrate of bismuth, is depo- 

 sited. 



Sp. 2. Muriate of Bismuth. This salt may be 

 obtained by dissolving bismuth in nitromuriatic acid, 

 and evaporating to drync&s. It forms small prisma- 

 tic crystals. It sublimes when heated, and forms a 

 white mast, which easily melts, formerly called but- 

 ter of bismuth. 



Sp. 3. Sulphate of Bismuth. This salt may be 

 obtained by heating a mixture of bismuth and sul- 

 phuric acid. A white mass remains, decomposed by 

 water. 



Sp. \. Sulphite of Rismxt/i. A white powder, BUmentt 

 insoluble in water. 



Sp. 5. 1'hotphate of Bismuth. Crystals soluble in ^ _ 

 water, and not altered by "exposure to the air. The 

 svbjiliosphalr <if lii\muth is a white insoluble powder. 



t>p. (>. Acetate of liixmitth. It may be obtained 

 by mixing solutions of nitrate of bismuth and ace- 

 tate of potash, and heating the mixture. Small 

 talky crystals of acetate of bismuth gradually preci- 

 pitate. 



Sp. 1. Succinate of Bismuth. Yellow crystalline 

 plates, soluble in water. 



Sp. 8. Beiizoate of Bismuth. Needle-shaped crys- 

 tals, not altered by exposure to the air, soluble in 

 water, and very sparingly soluble in alcohol. 



Sp. i). Otalatc of Bismuth. A white powder, 

 scarcely soluble in water. 



Sp. 10. Tart rate of Bismuth. A white insoluble 

 powder. 



Sp. 11. Arseniatt of Bismuth. A white tasteless 

 powder, sometimes having a shade of green ; inso- 

 luble in water and nitric acid, but soluble in muriatic- 

 acid. 



Sp. 12. Molybdale of Bismuth. A white insoluble- 

 powder. 



GENUS XVI. Salts of Antimony. 



The oxides of antimony combine but imperfectly Salts of 

 with acids, and the salts which they form have not antimony, 

 been very carefully examined. Their solutions have 

 usually a brownish yellow colour, and in most cases 

 a precipitate falls when they are diluted with water. 

 Prussiate of potash and infusion of nutgalls throw 

 down a white precipitate, hydrosulphuret of potash 

 an orange-coloured precipitate. 



Sp. 1. Nitrate of Antimony. Nitric acid attacks 

 antimony slowly. Nitrous gas is emitted, ammonia 

 formed, and the metal converted into white oxide. 

 A portion of it is dissolved, but it does not yield 

 crystals. 



Sp. 2. Sulphate of Antimony. Sulphuric acid oxi- 

 dizes antimony at a boiling heat, and converts it into 

 a white mass, from which water separates the acid. 



Sp. 3. Sulphite of Antimony. This compound is 



precipitated in the state of a white powder, by pour- 



' ing sulphurous acid into the solution of antimony in 



muriatic acid. It has an acrid and astringent taste, 



melts when heated, and is decomposed. 



Sp. 4. Phosphate of Antimony. This salt is solu- 

 ble in water : it does not crystallize. 



Sp. 5. Acetate nf Antimony. Acetic acid dissolves 

 the oxides of antimony, and forms a salt which cry- 

 stallizes, and is soluble in water. 



Sp. 6. Oxalate of Antimony. Small crystalline 

 grains, scarcely soluble in water. 



Sp. 7. Tartrate of. in/imam/. This salt docs not 

 crystallize, but readily assumes the form of a jelly. 



Sp. 8. Arseniatc of Antimony. A white powder, 

 insoluble in water. 



Sp. 9. Tartrate of Potash-and-Antimoni/. This 

 salt, usually called tartar emetic, was first made known 

 to chemists in 1631. It may be prepared by mixing 

 together equal parts of peroxide of antimony and 

 tartar, and boiling them iu ten times their weight of 



