OF ARTS AND SCIENCES. S57 



The solubility of the salt in water at 19°. 5 was determined in the 

 usual manner. The calcium was precipitated as oxalate, and the 

 oxalate ignited with sulphuric acid. 



I. 18.1457 grm. solution saturated at 19°.5 gave 0.0342 grm. CaS0 4 . 

 II. 14.6806 grm. solution saturated at 19°. 5 gave 0.0265 grm. CaS0 4 . 



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

 percentages of anhydrous salt : — 



i. ii. 



0.65 0.62 



Potassic Trichlorpyromucate, KC 5 C1 3 3 . — The potassium salt was 

 prepared by boiling the acid with a slight excess of potassic carbonate. 

 The solution was then concentrated until the salt began to separate, 

 and on cooling it solidified to a mass of crystals, which were filtered off 

 on the pump and pressed dry with filter paper. The salt is readily 

 soluble even in cold water, and separates from a hot concentrated 

 solution in sheaves of fine needles, which lose nothing in weight when 

 heated to 120°. Analyses of the salt dried at this temperature proved 

 it to be anhydrous. 



I. 0.5338 grm. salt dried at 120° gave 0.1851 grm. K 2 S0 4 . 

 II. 4425 grm. salt dried at 120° gave 0.1532 grm. K 2 S0 4 . 



Calculated for Found. 



KC 5 C1 3 3 . I. II. 



K 15.42 15.57 15.54 



Argentic Trichlorpyromucate, AgC 5 Cl,0 3 . — The silver salt may 

 best be prepared by precipitating a hot solution of the calcium salt 

 with argentic nitrate. For analysis the precipitated salt was well 

 washed, and then recrystallized from hot water. It is sparingly solu- 

 ble even in hot water, less soluble in cold water, and crystallizes from 

 a hot concentrated solution in moss-like aggregations of fine needles. 



The aii-dried salt gave on analysis much too low a percentage of 

 silver, and although the sample analyzed was free from calcium salt 

 and free acid, it failed to give perfectly satisfactory results even when 

 dried in vacuo over sulphuric acid or at 100°. 



I. 0.5142 grm. salt dried in vacuo over H 2 S0 4 gave 0.2254 grm. 



AgCl. 



II. 0.4545 grm. salt dried at 100° gave 0.1998 grm. AgCl. 



Calculated for Found. 



C 5 Cl,0,Ag. i. a 



Ag 33.48 33.00 33.10 



