971 



Therefore, wc are denliii,?, willi Ihc coiicciilralioiis of />' in llie two 



phases. If we call the conccMtralioii of /> in llic (iispei'sixe UK'diimi: 



«J' 

 c' and llial ill the phase /I : (in a<;iveiiieiil with the notation nscd hv 



m 



Frkundlich in his "Kapillarcheniie") il follows that in ihe inonoN ariani 



■7; 

 (/> 7') -system mnsl then be = /'(o). 



8. Only in the case where 11 in A yields a coniponnd occiirrin<^- 

 in a separate phase, the system becomes non-variant ip-T), hence 



X 



= (t (co/istaiif) 

 m 



SO that the "componnd" is independent of the concentiation. 



We then speak of a real chemical componnd that confoi-ms to 

 the "law of Proust". This is in harmony with the idea of Wald, 

 who for years has been li'jin^ to demonstrate that the constant 

 composition, with which we credit onr chemical componnds. is caused 

 b}' the manner in which we generate these componnds. For we 

 always utilise the occurrence of new phases (distillation, crystal- 

 lisation, sublimation). 



4. As a rule, however, — will be a function of c. 



The nature of this function may be determined l)y moans of the 

 law of mass action. 



We now apply the same to the "compound" which /> can form 

 with A and call the number of <>ram. mols. of .1, /> and the com- 

 pound m, p and q, respectively. 



Let the formula of the compound be A,,, Hi, . then if 



9 <i 

 mA -\- pB-^q A,u Bj, 

 '/ 7 

 we get, according to the law of mass action, 



"^^'^ = 1. (1) 



''''ah 

 In this only the concentrations in which H appears are 

 changeable. 



.^ 

 If again we call C'.i/; : and T/,- : r- then (1) passes into 



in 



63 



Proceedings Royal Acud. Amsterdam. Vol. XVI. 



