Comhinatims of different Metals and Chlorine, &"€. 11 



camphor. The action of the liquor of Libaviiis on the oil 

 of turpentine is worthy of furiher inqnivy. The preceding 

 account of it, I am aware, is very incomplete ; but I trust 

 it will <erve to call the attention of chemists to a subject so 

 curious. 



To discover the proportions of tin, and consequently of 

 chlorine, in stannane and stannanea, 1 have taken advantage 

 of ihe superior affinity of zmc for chlorine, by means of 

 which the tin is s^eparated in its metallic stale. 



69-3 grains of siannane, nude by healing in a glass tube 

 with a very small oriiice an amalgam of tin with calomel, 

 were, with the exception of two grains of metallic mercury, 

 apparently a mere mechanical mi.xture, entirely dissolved 

 in dilute muriatic acid. A slip of clean zinc, immersed ia 

 this solution decanted from the residual mercury, quickly 

 precipitated the tin in a very beautiful plumose form : and 

 this precipitate collected on a filter, and well washed and 

 dried and fused into one globule under a cover of tallow in 

 a siT)all glass tube, weighed 42 grains. 



As therefore 67-5 grains of stannane contain 42 grains 

 of tin, 100 appear to consist of 



62-22 tin 



37-78 chlorine 



100-00 

 As stannaneais extremely volatile, it is difHcult to weigh 

 it with perfect accuracv. The mode 1 adopted, was to 

 pour it into a bottle half full of water, the weight of which 

 was previously ascertained, and to infer the quantity added 

 by the increase of weight. 



81-75 grains of stainianea, thus weighed in water*, af- 

 forded when decomposed by zinc 34 grains of tm. 

 Hence 100 of stannanea appear to be composed of 

 42-1 im 

 579 chlorine 



100 0. 

 T am not acquainted with any analytical method for di- 

 rectly ascertaining the pit)|)orlion of chlorine in ei-her ot 

 the two preceding ccunbinations. Nitrat of silver, when 

 immediately applied, will not answer the- purpose, because 



• A little niuriaiic acid was added bLfore the zinc was introduced, lo dis- 

 iolve the oxide of zinc which, in otlit-r similar cxppriinents, I oh'iprvod was 

 rapidly formed, and which, froiv. llic large quantity of hvdroijeii evolved, 

 appeared to lie owing to the decomposition of v/atcr, chiefly in conseciuence 

 of the Galvanic effect of the contact of the two different metals, zinc and 



tin. , 



the 



