J3J 



mimbei'S placed between parentheses do not indicate tlie composition 

 of the rest but that of the complex. 



When we draw in fig. 1 tiie line 117^, then we see that it does 

 intersect curve ab, but not be. The compound AsJ), . JSl H ,Cl h, 

 consequently decomposed by water with separation o\' As^O,. 



d. The system H,0~-As,0,-~NaCl. 

 In this system at 30° only the two components As^O^ and ^'aCI 

 occur as solid phases, we have not found a compound. 



We may represent the isotherm schematically by fig. 2; then the 

 anglepoint Z represents the j\aCl. Consequently the isotherm consists 

 of two branches, viz. : 



ab the saturationcurve of As^O, 

 be „ „ „ iVaCl. 



It is apparent from table 3 that the solu- 

 bility of As^O^ decreases with increasing 

 percentage of NaCl of the solutions. The 

 saturated aqueous solution of ^.y^Oj contains 

 viz. 2.26"/o AsJJ^, the solution saturated 

 with NaCI -\- As^O, contains only 1.58% 

 .l.y/>j. As a saturated solution of KCl con- 

 tains 0.78% As,0, and a solution saturated 

 '''^- '-• with NH.Cl 0.2917„ As,0,, it is apparent 



that /Ls-jO, is expelled least by NaCl and the most by N H^Cl ïvom 

 its solution. 



TABLE 3. 



Composition in percentages by weigtit at 30° 



