290 PROCEEDINGS OF THE AMERICAN ACADEMY 



1.5355 grm. air-dried salt lost over H2SO4 0.2467 grm. HjO. 



Calculated for BaCgHCISGo . 5 HjO. Found. 



4H2O 15.95 16.06 



I. 1.5480 grm. salt dried at 130° gave 0.9992 grm. BaSOi. 

 II. 1.2325 grm. salt dried at 140° gave 0.7866 grm. BaSOi- 



Ba 



The solubility of the salt in cold water was determined in the usual 

 way. 



I. 35.0277 grm. solution saturated at 18° gave 0.3817 grm. BaSOi- 

 11. 27.2112 grm. solution saturated at 18° gave 0.2985 grm. BaSOi. 



The solution saturated at 18° therefore contained the following per- 

 centages of the anhydrous salt : — 



I. n. 



1.69 1.70 



Acid Baric pSulpho-'^-Chlorpyromucate, Ba(C6H2ClS06)2 ■ 4 HgO. 



This salt was made by mixing solutions of the neutral barium salt 

 and the free acid in equivalent quantities. It proved to be quite read- 

 ily soluble in cold water, much more freely soluble in hot water, and 

 separated on cooling in well formed rhombic prisms which were per- 

 manent in the air and lost nothing over sulphuric acid. 



I. 0.6413 grm. air-dried salt gave 0.2261 grm. BaS04. 

 II. 0.6463 grm. air-dried salt gave 0.2281 grm. BaSO*. 

 III. 1.7167 grm. air-dried salt lost at 125° 0.1855 grm. H.O. 



Calculated for Found. 



Ba(C5H2ClSOo)2 4H2O. I. II. Ill, 



Ba 20.76 20.72 20.75 



H2O 10.91 10.81 



I. 0.7345 grm. salt dried at 125° gave 0.2900 grm. BaSOi. 

 n. 0.7734 grm. salt dried at 125° gave 0.3052 grm. BaSOi. 



Calculated for Found 



BalCoH^ClSOo). I. II. 



Ba 23.30 23.21 23.20 



The solubility of the salt in cold water was also determined. 



I. 6.7510 grm. solution saturated at 20° gave 0.1935 grm. BaS04. 

 II. 5.6625 grm. solution saturated at 20° gave 0.1627 grm. BaS04. 



