ON MURIATE OF TIN. \^^ 



The solution of tin by muriatic acid, as directed by various Solution of tin 



uriatic 

 ssisted by 



mthors, and b$ practised by Baume, is efiecte/d by pour- b ? muriatic 

 ., , . ' . r. i- • • acidassi 



ing on one part of this metal, in a state of extreme division, heat 

 four part* of common muriatic acid, and assisting the che- 

 mical actiou by the heat of a sand-bath. The water serving 

 as a vehicle to the acid is decomposed ; the oxigen oxides the 

 metal, which then combines with the acid; while the hulro- 

 gen is evolved in the state of gas, carrying with it some parti- 

 cles of the metal employed, which render it very fetid. But 

 the action is slow, and the dissolution is imperfectly effected. 

 I have observed, that a very large portion of the acid is com- 

 pletely lost by evaporation, and that, if you would dissolve 

 the whole of the metal, you must not only add fresh acid, 

 to supply the place of what is thus wasted, but. keep up 

 the action by artificial heat for several days. I tried to effect 

 this operation in the cold, and two months were insufficient. 

 Bayen and Charlurd, in their experiments on tin, employed 

 as much as six months. 



IV1r. Chaptal assists the chemical action between muriatic Tin put into 



acid and tin, by placing the metal, when he prepares the water, and 



. , . . . « _ I7 1C , . * . , . , muriatic acid 



acid, in the jars ot Woulres Apparatus, in which is the g as passed int» 



water to absorb the vapours. The heat that is evolved **• 



has an excellent effect, and the action becomes very brisk 



toward the end of the process. But this ingenious device 



leaves something still to be desired, as the acid dissolves 



only a fourth of its weight of tin, and the solution requires 



to be finished by other means. 



The solution of tin is still better effected bv admitting ~.. ,. 



=9 J m exposed to. 



into a large receiver, in which there is a sufficient quantity nascent muria- 

 of the metal in a state of division, the vapours of muriatic tle acid gas# 

 acid evolved from a mixture of powdered muriate of soda 

 and sulphuric acid diluted to 40° of the areometer for acids. 

 In proceeding thus by simple distillation, the vapours of 

 muriatic acid are pretty easily condensed and combined 

 with the tin. 



If the vapours of oximuriatic acid be received into a ves»- y m in mur j a . 

 &el containing tin and common muriatic acid, the solution tic acid ex 

 \i effected completely, and in a short time. The acid wt mxuwticmEkl 

 20° will then take up the third of its weight of tin. gas. 



I have tried various mixtures of muriatic and nitric acid, Action of ni« 



