1885.] Solubility of Calcium Sulphate in Water. 335 



From this it will be seen that whilst the magnesium chloride is 

 rapidly decomposed and precipitated by the water as the temperature 

 is raised, yet the solvent action of the hydrochloric acid which is thus 

 formed in the solution is partly counteracted, probably by the 

 magnesium chloride which remains dissolved, and which may act in 

 the same manner as calcium chloride. 



Table V. — Solubility of Calcium Sulphate in Water in presence of 

 various proportions of Sodium Chloride. Temperature 20°. 

 100 parts of water 



( ' >v 



Containing parts of NaCl. Dissolve parts of CaS0 4 . 



o-oo 





0-52 



....... -301 



2-03 



-441 



5-02 





5-05 



-634 



10*00 



-738 



20-00 





24-40 



-820 



35-10 



-734 



35-86 



-709 



Fig. 3. 



