108 



PROCEEDINGS OP THE AMERICAN ACADEMY 



The solubility of this salt we determined by the method of V. 

 Meyer. A saturated solution was kept at 20° for three hours, filtered, 

 evaporated to dryness, and the residue ignited with sulphuric acid. 



I. 1.8400 grm. solution gave 0.0977 grm. BaSO^. 

 11. 0.892G grm. solution gave 0.0470 grm. BaSO^ . 



These results correspond to the percentages : — 



I. II. 



18.82 18.66 



Calcic chlortrihrompropionate Ca(C3HClBr302)2 . 



To prepare the calcium salt we neutralized a solution of the acid 

 with calcic carbonate and calcic hydrate, and allowed the filtered solu- 

 tion to evaporate spontaneously. From the concentrated solution the 

 salt separated in clustered needles, which, when air-dried, were constant 

 at 80°. 



1.0691 grm. of the salt dried at 80° gave on ignition with HgSO^ 

 0.1883 grm. CaSO^ . 



Calculated for Ca(C3HClBr302)2 • 

 Ca 5.49 



Found. 

 5.25 



Potassic chlortribrompropionate KCgHClBrgOj 



H^O. 



The potassium salt was made by neutralizing a solution of the acid 

 with potassic carbonate and evaporating at the ordinary temperature. 

 This salt crystallized in rhombic prisms which are freely soluble in 

 cold water. It contained one molecule of crystal water which was 

 given up over sulphuric acid. 



I. 1.0688 grm. air-dried salt gave 0.0502 grm. H.O. 

 II. 1.0428 grm. air-dried salt gave 0.0490 grm. H^O. 

 III. 0.9802 grm. of the anhydrous salt gave 0.2201 grm. K2SO4. 



