338 PROCEEDINGS OP THE AMERICAN ACADEMY 



I. 23.0222 grm. solution saturated at 19°.5 gave 0.0503 grm. BaS0 4 . 

 II. 22.4890 grm. solution saturated at 19°.5 gave 0.0487 grm. BaS0 4 . 



The solution saturated at 19.5° therefore contained the following per- 

 centages of anhydrous salt. 



i. n. 



0.46 0.46 



Calcic /3y Dichlorpyromucate, Ca(C 5 HCl 2 3 ) 2 . 4 H 2 0. — The calcium 

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

 calcic carbonate. It is readily soluble in hot water, less soluble in 

 cold, and crystallizes from a hot concentrated solution in long clustered 

 needles which contain four molecules of water. 



The crystallized salt is permanent in the air, effloresces slowly over 

 sulphuric acid, and loses all its water readily at 110°. 



I. 2.7640 grm. air-dried salt lost at 11"0° 0.4160 grm. H 2 0. 

 II. 3.1275 grm. air-dried salt lost at 113° 0.4707 grm. H 2 0. 



Calculated for Found. 



Ca(C 6 HCK0 3 ) 2 . 4 H 2 0. I. II. 



H 2 15.26 15.05 15.05 



I. 0.6595 grm. salt dried at 110° gave 0.2227 grm. CaS0 4 . 

 II. 0.7004 grm. salt dried at 113° gave 0.2366 grm. CaS0 4 . 



Calculated for Found. 



Ca(C 6 HCl.,0 3 ) 2 . I. II. 



Ca 10.00 9.93 9.94 



The solubility of the salt in water at 19.5° was determined as usual. 

 The calcium was precipitated as oxalate and the oxalate ignited with 

 sulphuric acid. 



I. 22.8797 grm. solution saturated at 19°. 5 gave 0.0944 grm. CaS0 4 . 

 II. 21.5915 grm. solution saturated at 19°. 5 gave 0.0891 grm. CaS0 4 . 



The solution saturated at 19°. 5 therefore contained the following 

 percentages of anhydrous salt: 



i. n. 



1.21 1.21 



Potassic fiy Dichlorpyromucate, KC 5 HC1 2 8 . — The potassium salt 

 is readily soluble in hot water, but rather sparingly soluble in cold 

 water, and separates from a hot concentrated solution in small prisms 

 which are anhydrous. 



I. 0.6130 grm. substance dried at 120° gave 0.2435 grm. K 2 S0 4 . 

 II. 0.8200 grm. substance dried at 120° gave 0.3265 grm. K 2 S0 4 . 



Calculated for Found. 



KC r> HCUO s . I. II. 



K 17.84 17.83 17.87 



