2t>4 On definite Vroporliom. 



tif the earth, the 10-56 grammes oF muriate must have 

 t;)ken up 'J'7-2 of muriatic ac;d. ' Cunstqueiitly dnj muriale 

 <ij hxayta consists oF 



I\lLiriatic acid €.5-75 100 



Baryia 74-'i5 'J834 



Tf it were possible to obuin a result for the carbonate 

 correct within a ten thousaudih, we might deduce from it in 

 ihts manner a very accurate analysis of the muriate. At 

 present the error can scarcely exceed one thonsandih. 



Bucholi; obtained, from 84 grains of igniied muriate of 

 baryta, 94'- grams of sulijhate; this gives, if we employ his 

 analysis of the sulphate, th.e quantity of muriatic acid 1| 

 per cent, too small ; but according to my analysis of that 

 salt, the 94|' gr. contain 6.'*37 of pure baryta. Now 

 6* : f)2-37 = ICO : 74-2.'), which is exactly the proportion 

 already deterniiued for the muriate of t)aryta. 'I his result 

 therefore cmi firms my determinatioa of the composition of 

 both these sul>stanees. 



5.) The 10-56 of muriate of baryta, obtained in the 

 fourth experiment, were dissolved in water, and precipitated 

 with nitrate of silver. The fused luna cornea weighed 

 14-55 gr. agreeinc; exactly with Bucholz's experiment, and 

 iliffcring but little from Rose's. Consequently 100 parts 

 cf the muriale of silver contain IS-G'JJ of muriatic acid, or 

 consist of Muriatic acid IS'/ lOO'O 



Oxide of silver 81-3 434-8 



The oxide of sih'er therefore will consist, according to 

 this experiment, of 



Silver 1)9-67 ' 100-000 "^ 



7-33 7;925 



VII. Sulphate of Copper. 



Five grammes of neutral sulphate of copper, which had 

 twcn rnade to crun)ble into pieces in a crucible of platina, 

 heated to the tenij)erature of inching tin, were dissolved in 

 water and precipitated by muriate of baryta. The precipi- 

 tate,"wa:^hed ■Ani\ ignited, weighed 7-22 grannne?, indicating 

 the presence of 2-435 gr. of sulphuric acid ; consequently 

 the remaining 2*545 of the 3 gr. were oxide of copper 3 

 and the sulphate of the oxide of copper consists of 

 Oxide of copper 30-90 10366 



Sulphuric acid 49- iO 10000 



Supposing 100 parts of sulphuric acid to require in the 

 base, by which they are saturated, 20 29 of oxvgen, this 

 quantity must be contained in 103-66 of the oxide of cop- 

 per. Now 125 : 23= 103 QQ : 2073 ; £0 that the result of 



calculation 



