330 rRiNCiri^ES. OF ^ulpiiuHic acid. 



Qr^« |a»t tvro, though cakulated in different wajiS^, co^^ 

 neatPQst to e^ch othw> ?Nnd thtypefore deserve raqst confidj^n^f . 

 l>ii<; iVir. Klaproth conceived It necessary to satisfy hiuj^t'if 

 by his own cxperirnents of the respective quantities of ti*e 

 elements of sulphuric acid, that he ««i§ht afterward apply 

 the results with more certainty to the analysis of pyrites or 

 metallic sulphurets. For this pdr|>ose he employed, as 

 other chemists had done, nitric acid and carbonate of bary- 

 l^oportion of tes ; the elements of tiiis salt-having previously been aseer- 

 the elements of taioted by him to ho. biu yfces -78, carbojtie acid -2^, 



sulphate of -^ j f 



barytes. Mr. BuchoJz, hovve\er having since asserted, that this 



salt consists of "79 barytes, ajid 'tX carbonic acid, Mr. 

 Klaproth repeated/ his analysis wit4i 9JU possible care, and 

 still obtained the same proportions m before. We may here 

 add, that ^Mr. Buchol? admits OTvly '%6 of acid in the car- 

 bonate of strontian., while Mr. Klaproth has found "30 in 

 all the analyses he has made of this substance. 



The results of the analysis of the sulphate of barytes 

 made by various chemists do not ditfer less than the propor- 

 tions they have assigned to the constituent principles of sul- 

 phuric acid. It is composed, 



Barytes. Sulphuric acid. 

 ■Given diflFer- According to Fourcroy, of - 66 34 



ently by differ- Clement and Dcsormes 67-82 32*18 



tut authors. 



Thenard 



Chencvix 

 Kirwan 

 Richtcr 

 Bucholz 



.Kirwan's-prc- If indeed we except the analyses of Chenevix and Thenard, 



fcfred byKIap-^l^g j.^^^ do not vary greatly from each other; and if we 



ta^^e a mean of t\(^s>e^ Kirwan's cosies nearest to it, which 



has induced Mr. Klaproth to adopt it as the most accurate. 



rroccss for de- Proceeding on these data, the followbig was the method 



cidiugtheques-^^^p^g^ by Mr. Klaproth. He introduced 200 grains of 



pure sulphur, and eight ounces of pure nitric acid, of the 



(Specific gravity of 1*32, into a retort, and distilled till about 



three fourths had passed over into the receiver. The pro* 



duct of this distillation was returned into ^e retort, and 



distilled a second time. Eight ounces more of acid wer« 



then added, and the whole distilled agaiu. 



The 



