302 COMPOSITION OF BARYTIC SALTS. 



quite limpid and colourless. The solution, being evapo- 

 rated to a pellicle, was decomposed by rectified alcohol, 

 which threw down the muriate of barytes, and retained iu 

 solution the small portion of muriate of stroutian, and any 

 other earthy muriate that might have been casually present. 

 The precipitate, being well washed in alcohol, was after- 

 ward ignited; but being in some degree fouled by a small 

 portion of charcoal from the decomposition of the alcohol, 

 it was redissolved in water, filtered and evaporated to dry- 

 ness, and then ignited. There was thus obtained a salt of 

 a pure white colour, which dissolved in cold water without 

 leaving any residue, and which I consider as pure muriate 

 of barytes. 



Sect. 2. Proportion of Water in crystallized Muriate of 

 Barytes, 



Proportion of A quantity of the above muriate was dissolved in warm 

 wator ' n the water, and left to crystallize by spontaneous evaporation. 

 The salt obtained, after being dried by an exposure for 

 several days to the air, weighed 183*25 grs. It was then 

 fully ignited for about an hour, at a heat somewhat less 

 than that required for its fusion, and lost in weight 26*75 

 grs., which I conclude to be only water, as the residue was 

 perfectly seluble in cold water* 



In another experiment 100 grs. of crystallized muriate, 

 that had been dried by the heat of boiling water, were re- 

 duced to 85*5 grs. by a heat somewhat inferior to ignition ; 

 being then heated to a low red it weighed a* betore 85*5 

 grs. ; it was then kept in fusion for about a quarter of an 

 hour, by which it lost less tha» 0*25 gr. 

 "4 5 or 14-6 Hence the water of crystallization in muriate of barytes 

 per cent. amounts to between 14*5 and 14*6 % per cent. 



Sect. 3. Ratio between the Muriate and Carhonate of Barytes, 



Ratio between 10 ° g rs * °* ? ignited muriate were dissolved in water, and 

 decomposed by cavboi 

 edulcorated and dried 

 water, weighed 93 grs. 



the muriate & decomposed by carbonate of soda. The precipitate, when 

 edulcorated and dried at a heat superior to that of boiling 



156-* 



