OF ARTS AND SCIENCES. 327 



Calcic o Chlorpyro?nucate i Ca(C 5 H 2 Cl(X) 2 . 3 H 2 0. — The calcium 

 salt was prepared by boiling the acid with an excess of calcic car- 

 bonate. It is readily soluble in hot water, rather sparingly soluble in 

 cold water, and separates from a hot concentrated solution in clustered 

 prisms with rectangular terminations. The air-dried salt contains 

 three molecules of water. It effloresces slowly over sulphuric acid, 

 and loses all its water readily at 100°. 



I. 1.0814 grm. air-dried salt lost at 100° 0.1480 grm. H,0. 

 II. 1.2247 grm. air-dried salt lost at 100° 0.1689 grm. H 2 0. 



Calculated for Found. 



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



H 2 14.03 13.70 13.79 



I. 0.6236 grm. salt dried at 100° gave 0.2564 grm. CaS0 4 . 

 II. 0.5509 grm. salt dried at 100° gave 0.2244 grm. CaS0 4 . 



Ca 



The solubility of the salt in cold water was determined according 

 to the method of V. Meyer. The calcium was precipitated as oxalate, 

 and the oxalate ignited with sulphuric acid. 



I. 21.6494 grm. solution saturated at 19°. 5 gave 0.1002 grm. CaS0 4 . 

 II. 17.7467 grm. solution saturated at 19°.5 gave 0.0809 grm. CaS0 4 . 



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

 percentages of anhydrous salt. 



i. n. 



1.13 1.11 



Potasstc 8 Chlorpyromucate, KC 5 H 2 C10 3 . — The potassium salt is 

 readily soluble even in cold water, and separates from a hot concen- 

 trated solution on rapid cooling in fine branching needles ; on slower 

 cooling, in small thin oblique plates. The salt lost nothing in weight 

 when dried at 120°, and analysis showed it to be anhydrous. 



I. 0.6543 grm. salt dried at 120° gave 0.3100 grm. K 2 S0 4 . 



II. 0.6390 grm. salt dried at 120° gave 0.3018 grm. K 2 S0 4 . 



K 



Argentic S Chlorpyromucate, AgC 5 H 2 C10 3 . — The silver salt may 

 best be prepared by precipitating a solution of the barium salt with 

 argentic nitrate. 



