1Q^ ON THE COMPOUNDS OF SULPHUR AND OXYGEN. 



Chemical exs- ing 2.88 muriatic acid : but the precipitate had a brownifli 

 mination of the ti^^g ^f which muriate of filver is deftitute. The 40 parts of 



red liquid or Jul- ° ^ , , ^ • j 



f hunted muriatic yellovv refiduum then contamed 

 «<■"'• 34.00 fulphur 



1.92 fulphuric acid 



2.88 muriatic acid 



1 .20 water or lofs 



40.00 

 Seventy parts ftill remain to be afcertained. They muft exift 

 in the folution of potafh. This folution, fuperfaturated with 

 nitric acid, and treated firft with nitrate of barytes, and next 

 with nitrate of filver, yielded precipitates indicating the pre- 

 fence of 4.8 fulphuric acid and 36.45 of muriatic acid. The 

 refiduum yield no farther precipitate with filver ; but, when 

 evaporated to dryncfs, fome yellow cryfials were obtained, 

 which gave traces of fulphur, but in too fmall quantity to be 

 weighed. This analyfis gives us the following proportions : 



35.00 fulphur 



39.33 muriatic acid 

 6.72 fulphuric acid 



81.05 

 28.95 



lofs 



fulphur 

 muriatic 

 fulphuric 





110.00 



31. S2 



35.75 



6.10 



acid 

 acid 



or per cent. 



73.67 

 26.33 lofs 

 This enormous lofs was owing, at leafl, in part, to the im- 

 probability of feparating from the filter, the whole fulphure- 

 ous mafs fo as to weigh it. This induced me to have recourfe 

 to the following method of afcertaining the proportions of ful- 

 phur in fulphureted muriatic acid. 

 Remarks on the When fulphureted muriatic acid is thrown into warm nitric 

 fulphuretofmu-acid a very violent efTervefcence takes place, and the whole 

 r.atic aci , mixture is thrown, with a kind of explofion, out of the vefTel. 



If the acid be cold, the efTervefcence is at firfl flow, but heat 

 is very foon evolved, and the fame efre6ts produced. When 

 the proportion of nitric acid is great, and the fulphuret dropt 



in 



