332 PROCEEDINGS OP THE AMERICAN ACADEMY 



Baric ft Chlorjvjromucate, Ba(C 5 H 2 C10 3 ) 2 . H 2 0. — The barium salt 

 was prepared by boiling a solution of the acid with an excess of baric 

 carbonate. The filtered solution was evaporated, and the salt which 

 separated on cooling recrystallized from hot water. It proved to be 

 readily soluble in hot water, more sparingly soluble in cold water, and 

 crystallized in long obliquely terminated prisms, which contained one 

 molecule of water. The salt is permanent in the air or over sulphuric 

 acid, but loses its water readily at 100°. 



I. 0.6092 grm. of the air-dried salt gave 0.3180 grm. BaS0 4 . 

 II. 1.3540 grm. of the air-dried salt lost at 100° 0.0576 grm. H 2 0. 



Calculated for Found. 



Ba(C 5 H 2 C10 3 ) 2 .H 2 0. I. II. 



Ba 30.72 30.69 



H 2 4.04 4.25 



0.4749 grm. of the salt dried at 100° gave 0.2587 grm. BaS0 4 . 



Calculated for 

 Ba(C 5 H 2 C10 3 ).,. Found. 



Ba 32.01 32.03 



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

 way. 



I. 10.2683 grm. solution saturated at 1 9°.l gave 0.1 1 49 grm. BaS0 4 . 

 II. 6.8737 grm. solution saturated at 19°. 1 gave 0.0747 grm. BaSQ.. 

 According to these determinations, the aqueous solution saturated at 

 19°. 1 contained the following percentages of the anhydrous salt: — 



i. II. 



2.06 2.00 



Calcic /? Chlorpyromucate, Ca(C 5 H 2 C10„) 2 . 3 H 2 0. — This salt was 

 prepared by neutralizing with calcic carbonate a boiling solution of the 

 acid. If the solution thus obtained is evaporated upon the water bath 

 clustered, pointed prisms of an anhydrous salt are formed when the 

 solution becomes highly concentrated. By evaporation in vacuo over 

 sulphuric acid at ordinary temperatures, tufts of fine branching prisms 

 are obtained which contain three molecules of water. The latter salt 

 is permanent in the air, effloresces over sulphuric acid, and loses its 

 water readily at 105°. 



I. 0.4226 grm. of the air-dried salt gave 0.1490 grm. CaS0 4 . 

 II. 1.3627 grm. of the air-dried salt lost at 105° 0.1902 grm. H 2 0. 



Calculated for Found. 



Ca(C 6 lI 2 C10.,),.3H 2 0. I. II. 



Ca 10.39 10.37 



H 2 14.03 13.95 



