504 



MM. Bunsen and SchischkoflP^s Chemical 



Gaseous products of decomposition. 



Carbonic acid 52"67 



Nitrogen 41-12 



Carbonic oxide 3*88 



Hydrogen 1-21 



Sulphuretted hydrogen . . . 0'60 



Oxygen. . .* 0-52 



Protoxide of nitrogen . . . 0-00 



10000 



Since the whole of the potassium of the powder remains in 

 the solid products of combustion^ the quantity of solid residue 

 obtained by the combustion of 1 grm. powder may be calculated 

 from the analyses A and B. According to analysis A, 1 grm. 

 of powder contains 0"3055 potassium ; the quantity of residue of 

 the composition B which contains so much potassium, amounts 

 to 0-6806 gi-m. 



Calculating the nitrogen present in this 0*6806 grm. residue, 

 and subtracting it from the nitrogen present in 1 grm. of powder, 

 we obtain the quantity of nitrogen contained in the gases arising 

 from a gramme of powder. The volume of gas, which, according 

 to analysis C, corresponds to the nitrogen thus calculated, weighs 

 0'3138 grm. Hence a gramme of the powder examined decom- 

 poses, in burning, into 0-6806 grm. residue of the composition 

 B, and into 0-3138 grm. gases of the composition C. 



The transformation which gunpowder experiences in burning 

 may be exhibited by the following scheme : — 



-5 TNitie . . 

 o Sulphur . 



a Charcoal 



0-78991 

 0-0984 " 



D. 



TKO SO' 

 KOCO^ 



KO S^ O' 

 KS . 



fResidue 0-6806 •{ KCyS* 

 KONQs 

 C . . 

 S . . 

 2NH^O,3CO 



fCj 00769 ^g< 

 \ H 0-0041 ■% 

 Lo 0-1 



•0307J , 



Gases 



0-4227 

 0-1264 

 0-0327 

 00213 

 0-0030 

 00372 

 0-0073 

 0-0014 

 - 00286 

 cub. cents. 

 = 79-40 

 = 101-71 

 = 7-49 

 = 2-34 

 = 1-16 

 _H)0 



193-10 



In analytical investigations, agreement in the weight of the 

 substances found, with the weight of the substance taken for 



J 



