MR. H. GRIMSHAW ON BASIC CALCIUM CHLORIDE. 279 



tratcd hydrochloric acid until saturated. This was boiled 

 with an excess of milk of lime for about an hour, filtered 

 whilst hot, and allowed to cool. The salt separated out 

 on standing, in slender, white, needle-shaped crystals, 

 generally from one half to an inch in length. They were 

 sometimes obtained not more than a quarter of an inch 

 in length and almost transparent, the separation not taking 

 place until the solution was agitated. The composition of 

 the crystals was in all cases the same, and was not affected 

 by the length of time they were allowed to remain in con- 

 tact with the liquid. 



The crystals, dried as quickly as possible between blot- 

 ting-paper, on analysis gave the following results : — 



(a) 0*677 g rm » g ave °* 2 73 grin. CaO. 



0*442 „ 0*228 „ AqCl and 0*0012 Aq. 



0*307 lost on heating 0*152 grm. 



(b) 0*359 grm. gave 0*144 grm. CaO. 



0*794 „ 0*2045 99 Aq CI and 0*0245 Aq. 



1*052 lost on heating 0*52 grm. 



Calculated for 



Found. 



Calculated for 



CaO, CaOHCl+7H 2 0. 







3 CaO, CaCl 2 4-i6H 2 < 



(a) 



(*) 



Ca 



29-144 



28-80 



2877 



28-22 



CI 



12*932 



12-86 



12-794 



12-522 



O 



5-829 







8465 



OH 



6193 









H 2 



45'9 01 



4940 



49'47 





dss on heating 



;49' x 79 



(H 2 0) 50793 





1 00*000 



IOO'OOO 



The constitution of the salt is therefore expressed by the 



formula Oi 4- 7 H,0. On heating, two molecules 



ICaCl ' 



of the salt decompose, forming 3 Ca O + Ca Cl z 4- 1 5 H z O. 



