264 Experiments to determine tlie [Oct. 



Hence if — 



Acid gas. Sulphur. Acid gas. Sulphur. 



0-38/6 : 0-01)53 :: 100 : 24*6 



For Oxygen. — The lead must be combined in the proportion of 

 one a oui to two atoms of oxygen, the same combination as the 

 yellow oxide of that metal. Then as 



l o i. in precipitate. o in precipitate. 



100 : 7-71 :: 1*237 : 0-09535 



AC. O AG O 



And 0-3876 : 0953 :: 100 : 24-6 oxygen per cent. 



For ylzote. — We are not acquainted with any combination of 

 azote with lead ; but we have seen that there exists an atom of 

 azote for every atom of oxygen in the precipitate. Hence we may 



o A 



arrive at the quantity of azote in the precipitate. As 1 : 1*799 :: 



O A O A O 



0-0953 : 0-17155 azote in precipitate— and as 1 : 1'799 :: 24*6 ; 



A 



44*255 azote per cent, in acid gas. 



For Hydrogen. — We are also unacquainted with any combina- 

 tion of lead with hydrogen ; but we have calculated that there 

 cxisis two atoms of hydrogen for every atom of oxygen in the acid 

 gas. We may hence deduce the quantity of hydrogen in the pre- 



o a h o H 



cipitate. As 1 : 0-266 :: 0-0953 : 0-0253 = hydrogen in precipi- 

 tate — and as 1 : 0*266 :: 24*6 : 6*54 = hydrogen percent, in acid 

 gas. The constituents of the acid gas, then, are found to exist in 

 these proportions : — 



In the quantity 



In the precipitate. formed in flask. Per cent. 



Sulphur 0*09535 = 1*5993 = 24*6 



Oxygen 009535 = 1*5993 = 24*6 



Azote 0*17155 = 2*8757 = 44*26 



Hydrogen . . . 0-02535 = 0*4262 = 6*545 



0*3876 6*5005 100 



We will proceed to inquire how these numbers agree with each 

 other, according to the laws of combination observed in most cases. 



The oxygen should be combined with lead in the precipitate in a 

 similar or multiple quantity of that in the oxide of lead. The 

 quantity of yellow oxide of lead in the precipitate is 1-3323 ; and 

 as 107-7 : 7*7 :: 1*3323 : 0-0953 oxygen in the yellow oxide of lead 

 in the precipitate* a quantity exactly corresponding to that of the 

 acid gas existing in combination with it. Hence the law of Berzc- 

 lius, that tlie oxygen of the acid is a proportional quantity to that 

 of the oxygen of" the base, holds here exactly. According to the 

 same laws, the azote ought to contain an equal or proportional 



