144 INORGANIC AGENTS 



Uses. — Zinc chloride is employed in a paste made into small pieces 

 with ilour; or on lint soaked in a saturated solution, dried, and introduced 

 precipitated by adding first nitric acid, then zinc carbonate. Filter and finally 

 evaporate. Zn^ + 4- HCl = 2 Zn C\ +.2H2. 



Properties. — A white or nearly white granular powder, or porcelain-like 

 masses, or moulded into pencils ; odorless ; it is so intensely caustic as to make 

 tasting dangerous unless the salt be dissolved in much water, when it has an 

 astringent, metallic taste; very deliquescent; reaction acid; soluble in about 0.25 

 parts of water; soluble in 1.3 parts of alcohol. 



LiauoR ZiNci Chlokidi. Solution of Zinc Chloride. (U. S. & B. P.) 



Derivation. — Made as above with the addition of water and containing not 

 less than 48.5 per cent, nor more than 52 per cent, of Zn CI2. 



Properties. — A clear, colorless, odorless liquid, having a very astringent, 

 metallic taste and an acid reaction. Spec. gr. about 1,548 at 25° C. (77° F.). 

 Used as disinfectant in 50 per cent, strength. 



Toxicology. — Zinc chloride is a powerful irritant if swallowed in any degree 

 of concentration, and will, therefore, produce gastro-enteritis. Emetics or the 



stomach tube should be used, followed by demulcents and sodium bicarbonate, 

 under the skin about the base of tumors to cause their destruction by 

 sloughing. Small skin tumors may be removed by the following paste 

 which mummifies the tissues and prevents hemorrhage: 



Zinci chloridi 3i. 



Pulveris amyli 3iii. 



Cocainae hydrochloridi 3ss. 



Aquae 3ii. 



M. 



S. Apply externally. 



Stronger pastes spread on gauze or packed in cavities and left 2 or 

 3 days are used to remove cancer, as follows : 



Zinci chloridi 



Pulveris amyli aa 3iii. 



Pulveris acaciae 



Aquae aa 3i. 



M. 



S. Apply externally. 



It is employed in the form of pencils on unhealthy, granulating sur- 

 faces, as in "foot rot," and injected in strong solution into fistulous tracts 

 to destroy their walls. It is not used internally. 



Zinci Sulphas. Zinc Sulphate. ZnSo, -|- 7 H^O. (U. S. & B. P.) 

 Bynonym.—White vitriol, E.; sulphate de zinc, vitriol Wane, couperose blanc, 

 F.; zinksulfat, schwefelsaures zinkoxyd, weisser vitriol, G.; zincum sulfuricum, 



PeWcaHom.— Prepared by dissolving zinc in sulphuric acid. Zn^ -f 2 H2SO4 =: 

 2 ZnSOi -f- 2 H2. 



Iron and tin exist as impurities, and are removed by chlorine solution and 

 zinc carbonate. 



Properties.—Colovl^ss, transparent, rhombic crystals, or as a granular, crys- 

 talline powder, without odor, and having an astringent, metallic taste. Efflo- 

 rescent in dry air; reaction acid; soluble in 0.9 parts of water, in 2.5 parts of 

 glycenn; insoluble in alcohol. 



/ncompaiifeZes.— Lead acetate, silver nitrate, lime water, alkalies and carbo- 

 nates, vegetable decoctions or infusions, and milk. 



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