THE COLLOID-CHEMISTRY >1 so.\I*s 



101 



duce results practically identical with those of the potassium 

 halogens when the effects of adding half molar concentrations 

 of tin- former salts are compared with those of molar concentra- 

 tions of the halogens. 



Because of the limited solubility of potassium sulphate and 

 of dipotassimn tartrate, Tables XXXIX and XL and Figs. 65 

 and i ii only serve to show that with increase in the concentration 

 of the added salts there is progressive increase in the viscosity 

 of the soap until gelation or, beyond this, a secondary lique- 

 faction occurs in the highest concentrations here employed. 



PRF. 66. 



However, by working at higher t< m|x natures the concentration 

 of both the sulphate and the tartrate may be increased to a pomi 

 where the soap is " salted-out." 



1. \I.I :m.| \\.\\ pith I'm*, r.7 and us ifaon t he effect* 



t lie potassium salts of two tribasic acids. Dipotassium 



phosphate (Fig. 67) and tripotassium < n rate (Fig. 68) in in, Basing 



conc t. lead to grlatim,. then lnjiiHaetion and 



. complete dehydration of potassium ..1,-atr. When compared 



i lent salts, the la 1 figures show 



ns are obtained at about the some molar 



concent rat ions of the potassium constituent of the systems, 



though subsequent liquefaction and dehydration occur somewhat 



