502 MM. Bunsen and SchischkoiF's Chemical 



how much residue and smoke on the one hand, and how much 

 gas on the other, are produced by the explosion of a determinate 

 weight of powder ? 



To decide this, we collected together and analysed the residue 

 and smoke formed in the combustion of the powder which yielded 

 the gases just investigated. 



For greater convenience in the analysis, an undetermined 

 quantity of the substance was again dissolved in so much water 

 that the volume of the whole liquid amounted to 500 cubic cen- 

 tims. To each determination 45 '474 cubic centims. vvei-e taken, 

 which were measured out in a graduated cylinder. The con- 

 stants used in calculating the experiments are, where they are 

 not specially stated, the same as in the analysis o'f the residue. 



1. Charcoal and Sulphur. — 500 cubic centims. gave 0'2141 

 grm. charcoal, sulphur, and incombustible residue. 0"1758 

 grm. of this mass, oxidized with nitric acid, gave 0"1749 grm. 

 sulphate of baryta, which for 0"2141 grm., the total amount of 

 the mass, corresponds to 0*0292 grm. sulphur. The mass which 

 had been treated with nitric acid, and the residue not so treated, 

 gave, when ignited together in an open crucible, 0*0248 grm. 

 incombustible residue. For one measure, or 45*475 cubic cen- 

 tims. of the liquid used in the subsequent experiments, there 

 correspond therefore, — 



Charcoal . . . 0*014561 grm. 

 Sulphur .... 0*002656 grm. 

 Residue .... 0002256 grm. 



2. Sulphide of Potassium. — The whole liquid (500 cubic cen- 

 tims.), treated as before with oxide of copper, gave 0*9902 grm. 

 sulphate of baryta, which is equivalent to 0*46787 sulphide of 

 potassium, or 0*1358 sulphur; and for 45*475 cubic centims. 

 corresponds to 0*04255 grm. sulphide of potassium. 



3. Hyposulphite of Potash. — One measure gave 35*1 burette 

 degrees, which corresponds to 0*06525 hyposulphite of potash. 



4. Sulphate of Potash. — One measure gave 1*1 31 grm. sul- 

 phate of baryta, which corresponds to 0*84463 grm. sulphate of 

 potash. 



5. Sulphoct/anide of Potassium. — One measure gave 12*5 bu- 

 rette degrees, which corresponds to 0*006105 sulphocyanide of 

 potassium. 



6. Ammonia. — One measure gave a = 0*06688, ^, = 46*6, 

 ^ = 17*3. This coi-responds to 0*01645 ammonia, or to 0*05709 

 2NH40, 3C02. 



7. Nitrate of Potash. — One measure was taken. The ammonia 

 was determined in a quantity of potash equal to that used in 

 the experiment; it gave a=0*05612, /i=27, and / = 26*4, 

 which corresponds to a quantity of ammonia equivalent to 



