CRYSTALLIZED HIDROSULPHURET OF SOUA. t>Q$ 



XII. 



On the Cryftallization of the Ilidrofulphuvet of Soda. By Crr. 

 Vauquelin *. 



JDERTHOLLET, in a memoir which he communicated to Berthollet's ob- 

 *he Inftitute about four years ago, (hewed that fulphurated ^j^SttdS? 

 hidrogen has feveral properties in common with the acids, fuch drogen performs 

 as that of reddening the tfrt&ure of turnfole, uniting with the * e jV£ aions ° f 

 •earths, the alkalis, and the metallic oxides, and forming cryf- 

 iallizable combinations with fome of thefe fubftances,. 



I have had occafion to obferve, a few days ago, one of fe Sulphurated***- 

 combinations of this kind, namely, that of fulphurated hidro- with fodaa cryf- 

 gen with foda. Having lixiviated a confiderable quantity oftalliwble fait j 

 loda, manufactured by Citizens Payen and Bourlier, to ex- 

 tract the carbonate of foda, I left the concentrated mother 

 water in a corner of the laboratory. At the end of fome 

 decads, I found at the bottom ofthis liquor a white tranfparent 

 fait, cryftallized in rectangular tetahedral prifms, terminated 

 by four-iided pyramids, fome of which were octahedral. As 

 •this is not the formaffumed by carbonate of foda, I made fome 

 experiments to determine its nature. Its tafte was at firftofan acrid, cauf- 

 acrid and cauftic, nearly refemb'ling that of the alkalis, which tlc > 

 led me to i'uipect that it might be cauftic foda ; but I was 

 foon undeceived, by an infupportably bitter tafte which fuc- fucceeded by ex- 

 ceeded, and by a flight odour of fuiph.urated hidrogen gas. :erne S| 



It is abundantly Soluble in water ; and hotwith-ftanding theve-y foluble in 

 caufticity, which ieems to announce that the alkali is united J™g» ™*J!°" 

 with a flight acid, neverthelefs it abforbed calorie in its folu- 

 iion. Its folution had no colour, but the fmell of fulphur 

 was stronger than that of the fait itfelf; the acids produced a effervefdng with 

 lively effervefcence, and developed a very ftrong fmell of aCi b » 

 fulphurated hidrogen gas. But the fluid did not become tur- 

 bid : the nitric and oxiginated muriatic acids, on the con -depofi ting ful- 

 trary, formed an abundant precipitate, which, when wafhed £?"^j[ ^ m " 

 and dried, exhibited all the characters of (lightly hidrogenatedmur. acids } 

 fulphur. The fait, or its folution, fpread on blotting paper, d.nk green as It 



foon aflumed a dark green colour. Laftlv, this fait precipi- dries . ; . _ 



o Ji . precipitates me- 



tates all the metallic oxides from their folutions, perfectly fi- t«ls like an hy- 



drofulphuvec ' y 



* Annales tie Chimie, No. 122, vol, xli. p. 190. 



3 milar 



