[ ^3S ] 



this acid liquor being diluted with 300 of water, then 400 grains 

 of the dilute acid contain 53,53 real acid; and confequently 1225 

 grains of it contained 163,9 grains ; '^^^ quantity therefore was 

 taken up by 125 of foda ; if therefore the fait tRvw formed con- 

 tained no water the fum of both thefe quantities fhould exprefs its 

 weight, namely, 163,9 + 125 = 288,9 grains ; but having very 

 gently evaporated the folution, namely, in a heat not exceeding 

 120'', and then drying the refiduum in a heat of 400** for fix 

 hours, I found it to weigh in the evaporating difh (from which I 

 could not fcparate it without lofs) 308 grains, confequently thefe 

 308 grains contained 19,1 of water, however it is evident that in 

 a greater heat even thefe would be evaporated. 



And then very nearly the fame proportion of acid and alkali 

 would be found as in the preceding experiment, for 308 — 19,1 

 = 288,9, ^^^ ^^ 288,9 grains contain 125 of alkali, 100 grains 

 of the nitrated foda fhould contain 43,27, and confequently 

 56,73 of acid; and allowing 19 grains of water in 308 of this 

 fait dried at 400", then 100 grains nitrated foda fhould contain 

 40,58 of foda, 53,21 of real nitrous acid, and 6,21 of water. 



And 100 grains mere foda faturated with nitrous acid fhould 

 afford 246,42 of nitrated foda dried at that heat. And ioo grains 

 real nitrous acid faturated by foda fhould give 188 nearly of ni- 

 trated foda dried as above. 



G g 2 Bergman 



