Relationship between Water and certain Salts. 125 

 Table of Sulphoethylate of Potassium and Water. 



Sulphoethylate 



of potassium, 



per cent. 



Water. 



Temperature at which 



Body 



per cent. 



solidification begins. 



separated. 



10 



90 



3 



- 2-2 



Ice. 



20 



80 



- 49 





30 



70 



- 8-2 





40 



60 



-12-1 





4501 



54-99 



-14-2 (cryogen -13° -9) 



Cryohydrate. 



50 



50 



— 6 (interpolated) 



Salt. 



53-71 



46-29 









6235 



37-65 



+15 



>> 



Sidphometliylate of Potassium (K, CH 3 S0 4 ). — The mode of 

 procedure was precisely like that above described. 



As a cryogen, it showed a temperature of — 11°'3. 



At the air-temperature (12°*3) an amount of 5*2254 grams 

 gave 2*8654 grams residue, or 54*8 per cent. 



16*5250 of the solution saturated at 0° gave 2*8654, or 

 47-08 per cent. 



The solidifying-temperature of the cryohydrate was found 

 to be -lL°-8; and 9-4940 grams of it yielded 3*7824, or 

 39*84 per cent, anhydrous salt. 



Table of Sulphomethylate of Potassium and Water. 



Sulphomethylate 



of potassium, 



per cent. 



Water, 



Temperature at which 



Body 



per cent. 



solidification begins. 



separated. 



10 



90 



o 



- 23 



Ice. 



15 



85 



- 3-6 



n 



20 



80 



- 50 





30 



70 



- 8-0 





39-84 



60-16 



-11-8 (cryogen -ll°-3) 



Cryohydrate. 



40 



60 



— 11-5 (interpolated) 



Salt. 



4708 



52-92 



00 





54-8 



45-2 



+ 12-3 





SulphoamylaU of Potassium (K, C 5 H n S0 4 ). — This salt *, 

 on being treated in quite a similar manner, gave the following 

 results. 



The temperature of the cryogen was found to be — 5° C. 



At the air-temperature (17°*3), a solution weighing 6*8099 

 grams gave 4*0494 grains residue, or 59*46 per cent. 



The solidifying- temperature of the cryohydrate was found 

 to be —5*4; and 11*958 grams of it gave 2*8737 grams of 



* Probably isoamylate. 



