[240] 



Now this acid contains 58 per cent, real acid, and confequently 

 240 grains of it contained 139,2 of real acid ; and ff 384 grains of 

 the cryftals contain 139,2, then 100 grains fhould contain 36,25. 

 But it muft be confidered-that fome was contained in the mother 

 liquor, fome in the cryftals that were not wafhed, but dried on 

 filtering paper, and fome was difperfed by the heat applied. 



This experiment alfo gives fome, though not an accurate in- 

 formation of the proportion of earth in nitrated barytes, for 308 

 grains of aerated barytes (at the rate of 21,5 percent.) contain 

 66,22 of fixed air, and confequently 241,78 of mere earth. Sup- 

 pofing then 384 grains of nitrated barytes to contain this quantity 

 of earth, 100 grains of this fait fhould contain 62. But this fup- 

 *pofition is inadmiflible by reafon of the lofles juft mentioned. 



Upon the whole we may ftate the centenary proportion of this 

 fait at 57 of earth, 32 real acid, and 1 1 of water. 



Hence 100 grains barytic earth take up 56 of real nitrous acid, 

 and fhould afford 175,43 of nitrated barytes. And 100 grains real 

 nitrous acid fhould take up 178,12 grains of barytic earth, and 

 fhould afford 312,5 of nitrated barytes. 



100 grains of this fait loft only ^ a grain of its weight by ex- 

 pofurc to a heat of 300" for half an hour. It is alfo difficultly 

 foluble. Its folution when faturated does not redden Litmus. 



Nitrated 



