1885.] 



Solubility of Calcium Sulphate in Water. 



333 



each case, the solubility being greatly diminished at temperatures 

 above 100°. 



Temperature 



20° .., 



44 ... 



67 ... 



85 .., 



101 ... 



130 



165 ... 



169 



179 



225 . . 



Parts of NaCl to 

 100 parts water. 



Table I. — Solubility of Calcium Sulphate in a solution of Common 

 Salt at various Temperatures. 



Parts of CaS0 4 to 

 100 parts water. 



823* 



830 



832 



823 



682 



392 



250 



244 



229 



178 



19 



•90 



19 



•93 



19 



•95 



19 



•90 



20 



•08 



19 



•92 



20 



•04 



20 



•05 



20 



•10 



21 



•00 



Table II. — Solubility of Calcium Sulphate in a solution of Ammonium 

 Chloride at various Temperatures. 



Temperature. 



8° ... 



9 ... 



25 ... 



39 ... 



60 ... 



80 ... 

 120 



Parts of NH 4 C1 

 to 100 water. 



25 

 25 

 25 

 25 

 25 

 25 

 25 



Parts of CaSCX, to 100 water. 



Exp. 1. 









Exp. 2. 



Mean. 



1 -061 



•999 



1 



•030 



1-011 



1-036 



1 



•023 



1-095 



1-097 



1 



•096 



1 -133 



1 -120 



1 



•126 



1121 



1 146 



1 



•133 



1024 



1 -029 



1 



•026 



1 -ooo 





1 



•ooo 



Table III. — Solubility of Calcium Sulphate in solution of Calcium 



Chloride at various Temperatures. 





Parts of CaCl 2 to 



Parts of CaS0 4 to 



Temperature. 



100 parts water. 



100 parts water. 



15° , , 





. . . -063 



21 , 



... 14-70 



. . . -086 



39 . . 



... 15-00 



. . . -091 



72 



... 14-90 



. . . 100 



94 



. . . . 15-16 



. , . 110 



138 



... 14-70 



•071 



170 .... 



. . . . 14 -82 



. . . -031 



195 .... 



.... 14-70 



. . . '022 



Mean of two experiments. 



