C H E M I S T R Y. 



93 



Elements 



nf 

 Chemittry. 



2. Aeetale. This salt may be obtained, by boiling 

 together in water 100 parts of su^arof lead, and 150 

 parts of Ltharge. Its taste is less sweet; it is less 

 ""' soluble in water than the preceding variety ; and it 



crystallizes in plates. A solution of this s*lt is em- 

 ployed by surgeons undjr the name of Goul.ird's ex- 

 tract. 



Sp. 10. Succinate o/ Lead. Slend.-r foliated crys- 

 tals, scarcely soluble in water, but soluble in nitric 

 acid. 



Sp. 11. Dcnzoalc of Lead. This salt forms white 

 crystals soluble in water and alcohol, and decompo- 

 sed by lieat. 



Sp. 12. Oxakile of Lead. Small crystals insoluble 

 in alcohol, and scarcely soluble in water, unless there 

 be an excess of acid present. 



Sp. 1'3. Tartrnte of I*ad. An insoluble white 

 powder decomposed by a moderate heat. It is com- 

 posed of 37 acid, and C3 yellow oxide. 



Sp. H. Citrate of Lead. A white powder, diffi- 

 cultly soljbV in water. 



Sp. !.>. Matate tff'Lead. A white powder, which 

 precipitates in fine light flakes, and is insoluble in 

 water, but easily soluble in acetic and weak nitric 

 acid. 



Sp. 16. Arseniate of Lead. A white powder, in- 

 soluble in water. It is composed of 35.7 acid, and 

 61 3 yellow oxide. 



Sp. 17. Mttlybdate of I^cad. A white powder, in- 

 soluble in water. It occurs native in rhomboidal 

 plates, of a yellow colour, and is composed of 34-. 7 

 acid, and 65 3 yellow oxide. 



Sp. 18. Tungslate of Letd. A white insoluble 

 powder. 



Sp. 19. C/mmatc of Lend. This is a fine red 

 powder, with a shade of yellow, tasteless, and inso- 

 luble'in water. It occurs native, crystallized in four- 

 sided prisms, and is composed of 31.9 acid, and 65.1 

 oxide. 



C E*L-S XIII. Salis of Nickel. 



9alt of The alts belonging to this genus have been but 



nickel. imperfectly examined. They are generally soluble 

 in water, and the solution has a fine green colour. 

 Prussia!? of potash dropt into them occasions a dull 

 green precipitate, hydrosulphuret of potash a black 

 precipitate, anil the infusion of nutgalls a greyish 

 white precipitate. 



Sp. 1. Nitrate of NickeL This salt crystallizes in 

 eight-sided pm-ns ; has a fine green colour ; when ex- 

 posed to the air it first deliquesces, and afterwards 

 fall* to powder, and gradually loses the whole of its 

 acid. It is composed of 55 acid, 25 oxide, and 20 

 water. It dissolves in alcohol. 



Sp. 2 . Muriite of Nickel. This salt may be ob- 

 tained by dissolving nickel in nitromuriatic acid, and 

 evaporating the solution. It crystallizes irregularly, 

 has an apple green colour, and deliq icsces in the air. 

 When heated :t loses its water, and may be sublimed 

 in the state of golden yellow flowers, which become 

 fjree;i by absorbing water from : lie atmosphere. This 

 salt is composed of 34 oxide, 1 1 acid, and 55 water. 

 It is soluble in alcohol. 



Sp. 3. Sulphate of NickeL ThU salt has a fine 



Elemenu 

 of 



green colour, and crystallizes in four-sided prisms, 



terminated by four-sided pyramids. It is soluble in 



, m i. Chemistry. 



three times us weight or water, and effloresces in the ^__ _ 1L J, 



air. It is composed of 25.63 oxide, 29.37 acid, and 

 65 water. 



Sp. 4. Carbonate of Nickel. This salt is obtained 

 by precipitating nitrate of nickel with carbonate of 

 potash. It is a green powder, composed of 56.4* 

 acid and wr>Ur, 4-3.6 oxide. 



Sp. 5. Flaate of Nickel. A salt which yields light 

 green-coloured crystals. 



Sp. 6. Acetate of Nickel. A salt which forms 

 rhnmboidal cry-tils of a green colour. It dissolves 

 in six times its weight of water. 



Sp. 7. Oralate of NickeL A green powder, 



scarcely soluble in water. 



Sp. 8. A/seriate of Nickel. 

 apple green colour. 



Sp. 9. Mulybdate of Nickel. 

 matter. 



Sp. 10. r/iotphatc of Nickel. 

 matter. 



Sp. 1 1 . Dorale of Nickel. Similar to the prece 

 ding. 



A soluble salt of an 

 A white insoluble 

 A green insoluble 



GENUS XIV. Salts of Zinc. 



Most of the salts of zinc are soluble in acids, and 

 may be formed directly by dissolving zinc in the dif- riiic. 

 ferent acids. Their solutions are transparent and co- 

 lourless. Prussiate of potash occasions a white pre- 

 cipitate, and infusion of nutgalU no precipitate. 



Sp. 1. Nitrate of Zinc. Nitric acid dissolves zinc 

 with great rapidity. The solution yields flat four- 

 sided prisms, which deliquesce in the air. They ace 

 very soluble both in water and alcohol. When heat- 

 ed they melt, and, in a strong heat, the acid is driven 

 off, and the oxide remains. 



Sp. 1. Muriate of /inc. Muriatic acid dissolves- 

 zinc with rapidity. The solution does not crystal- 

 lize, but yields a gelatinous mass, which deliquesces 

 in the air. When heated it sublimes, and forms a 

 white coloured mass composed of small needles. It 

 is very soluble in water. 



Sp. 3. Sulphate of Zinc. Diluted sulphuric acid 

 dissolves zinc with rapidity. The solution, when 

 concentrated, yields crystals of sulphate of zinc. 

 This salt was discovered at Ramelsberg in Germany, 

 about the middle of the 16th century, and introduced 

 into commerce under the name of white vitriol. Iti 

 crystals are four sided flat prisms. Culd water dis- 

 solves nearly 1 times its weight of it, and boiling 

 water dissolves any quantity whatever. When heat- 

 ed it melts, and, at a red heat, it parts with most of 

 its acid. It is composed of 28.2 oxide, 2.5.8 acicl, 

 and 4-6 water. It contains an excess of acid. 



Sp. 4. Sulphite nf /inc. Sulphurous acid dissolves 

 zinc, and, by evaporation, two distinct sets of crys. 

 tals are obtained. The first of mlnhitrcied sulph'te, 

 consisting of sulphite combined with sulphur. Its 

 crystals are four-sided prisms, solub'e both in water 

 and alcohol. In th? air th-y become white, and de- 

 posit an insoluble powder. They absorb oxygen 

 very slowly when exposed to the atmosphere. The 

 fdpliilc of zinc also crystahiz?s. It is lets acrid, but- 



