6 Analysis of the residuum of fired gimpowder. [Jan. 



se has been formed at an unnecessary heat" — but not at a 

 " heat below redness." 



33. — On this view of the case it is very plain how some 

 of the substances before enumerated may be accounted for, 

 such as the sulphuretted hydrogen, &c. and it is equally 

 plain that from the complex action of the sulphuret, the 

 analysis must be in some measure governed by it. 



34. — I shall therefore in tracing out the ultimate results 

 of the experiment consider the sulphur to be in combination 

 with hydrogen, and with potassa (12) and account for it ac- 

 cordingly. I shall also consider the sulphuric, and carbonic 

 acids to be in combination with potassa (8). 



35. — The following course must therefore be pursued : — ■ 

 23.10 grs, of sulphate baryta contain 7.83 grs. of Sulphuric acid. 

 20.50 Carbonate do. do* 4.51 „ Carbonic acid. 

 15.40 „ Sulphuret of silver do. 1.95 „ Sulphur. 



59.00 „ Nitrate potassa do. 27-76 „ Potassa. 



1.95 „ Sulphur is combined thus J .08withpotassa (potassium) 



) and 0.87 with Hydrogen. 



s 36.— A gain— 



;7.83 sulphuric acid make when? i«. oo c i i * er> i 



K combined with potassa. £ 17 22 Slll * jliate of Potassa * 



4?fx>\ Carbonic acid do. do. 14-35 Carbonate of potassa. 



A. 08 Sulphur do. do. 3*78 Sulphuret of potassium. 



0-87 do. combined with hydrogen 0*87 Sulphuretted hydrogen. 



37. — W e have now to ascertain from the foregoing, how 

 they affect the results indicated by the saltpetre, and what 

 quantity of the base, potassa, they consume, or are combined 

 with ; and whether the saltpetre affords just a sufficient quan- 

 tity of the base, or whether it is deficient, or in excess. 



38. — The quantity of potassa in 59grains of nitre is 27*76 

 of which 7-83 of sulphuric acid combine with 9 39 



4*51 of carbonic acid take up 9*84 

 1 -08 of sulphur maybe combined with 2*70 

 Surplus potassa 5*83 



-27-76 



39. — That there was some uncombined alkali contained in 

 the substance under examination has been before shown (15) 

 but the quantity was very small, and could not possibly amount 

 to the above surplus of grains 5*83. The question therefore 



