FLUORIC ACID. 



for it was neutral, and contained (as we have 

 seen) 1*25 of fluoric acid, which, being equiva- 

 lent to an atom, required for saturation 4, or an 

 atom of soda. 



(2.) 5*25 grains of anhydrous fluate of soda, 

 and 13*25 grains of chloride of barium were dis- 

 solved in separate portions of water, the liquids 

 were mixed together, and evaporated to dryness 

 in a platinum crucible by means of a very gentle 

 heat. Distilled water was poured upon the re- 

 sidue, and digested on it for twenty-four hours. 

 A little of it was then drawn off; and tested with 

 sulphate of soda and muriate of barytes ; but it 

 was not in the least affected by either of these 

 reagents, showing that it contained no sensible 

 quantity either of barytes or of fluoric acid. 



The fluate of barytes formed in this experi- Fluate O f 

 ment, being collected on a double filter, washed, 

 dried, and heated to redness, weighed almost ex- 

 actly 11 grains. 



This experiment agrees with the preceding, 

 and serves to confirm it. We see that anhydrous 

 fluate of barytes is composed of 



Fluoric acid 1-25 

 Barytes 9-75 



11 



and that l2o grains of fluoric acid just saturate 

 9*7<5 grains of barytes. This experiment, like 

 the preceding, was made four or five times be- 



