126 Thermal Relationship between Water and certain Salts. 



anhydrous salt, or 24*03 per cent. 15*667 of the solution, 

 saturated at 0°, gave 5*240 of anhydrous salt, or 33*44 per 

 cent. 



Table of Sulphoamylate of Potassium and Water. 



Sulphoamylate 



of potassium, 



per cent. 



Water, 

 per cent. 



Temperature at which 

 solidification begins. 



Body 

 separated. 



10 



20 



2403 



25 



33-44 



59-46 



90 



80 



75-97 



75 



66-56 



4054 







- 1-9 



- 4-3 



— 54 (cryogen —5°) 



— 4-8 (interpolated) 

 00 



■4-173 



Ice. 



Oryohydrate. i 

 Salt. 



The accompanying figure shows the relationship, in respect 

 to water, of these three closely allied salts. The abscissae are 

 percentages, the ordinates temperatures. 



The ethyl and methyl combinations run an almost common 

 course as tar as the cry ohyd rate of the latter. They cross at 

 about 24 per cent. The oryohydrate of the ethyl salt contains 

 about 5 per cent, more salt and melts at 2°'4 lower. The 

 ascending or salt branches of the curves are almost absolutely 

 parallel, but exhibiting a slightly opposite curvature. 



