J 20 COMBINATIONS OF OXIMUKIATIC ACID AND METALS. 



VII. 



All Account of some Experiments on the Comlinations of diffc' 

 rent Metals and Chlorine, t^c. By John Davy, Esq. Com- 

 municated by Sir Humphry Davy, Kt. LL. D., Sec. R. S. 



('Concluded from p. 21 J 



4. On the Comlinations of Chlorine with Manganese, Lead, 



Zinc, Arsenic, Antimony, and Bismuth. 



Only 1 com- "Tr HAVE attempted, by several methods, to obtain more 



pound with Jj_ tjjgjj one combination of these different metals and chlo- 

 some metals. . , . , 



rine, but without success. 



Compound of I have procured a compound of manganese and chlorine, by 

 aciTand'man- evaporating to dryness the white muriate of this metal, and heat- 

 ganese, ing to redness the residue in a glass tube, having only a very 



small orifice. Muriatic acid vapour was produced, and a fixed 

 compound remained, which required a red heat for its fusion, 

 and was not altered by the strongest heat that could be given to 

 it in the glass tube ; but was rapidly decomposed when heated 

 in an open vessel, muriatic acid fumes being evolved, and oxide 

 of manganese formed, which was black or red, according to 

 the intensity of the heat applied. The compound of manga- 

 nese and chlorine is a very beautiful substance, it is of great 

 brilliancy, generally of a pure delicate light pink colour, and of 

 a lamellar texture, consisting of broad thin plates. 

 Mode of free- There is not much difficulty in obtaining this compound 

 pure. Iron, with which manganese is commonly contami- 

 nated, pi ay be separated by two or three repetitions of the solu- 

 tion of the compound in water, the evaporation to dryness of 

 the clear filtered muriat, and fusion of the residue procured by 

 evaporation. Indeed, I think this a good general method for 

 purifying manganese from iron. One of the combinations of 

 the latter metal and chlorine being volatile, heat must sepa- 

 rate it from the compound of manganese. And I have thus 

 obtained it so free from iron, that triple prussiate of potash, 

 added to its solution in water, gave merely a white precipitate, 

 without the slightest tint of blue. 

 Its properties. This compound deliquesces when exposed to the atmo- 

 sphere, and is converted into the white muriate. Like ferrane, 

 it affords a trifling residue when heated with water. The re- 

 sidue 



ing it from 

 iron. 



