688 



distribution of the (i}es between water and isobntylic alcohol when 

 onlj the sodium salts ^) of different acids were present. 



1 ccm. of the solution of the electrolyte (12 millimol p. L.) was 

 added to 2 ccm. of a 0.5 7o solntion of the dye (the tirst experiment 

 was made, of course, with 1 ccm. of pure water). Then 2 ccm. of 

 isobntylic alcohol were added and the whole was shaken in a tube 

 with a glass stopper. 



As the result we give the series in which the salts favour the 

 transition from the waterlayer to the alcohol. From the left to the 

 right ■ the ions are written in the same series as they cause the 

 alcohol to take a darker colour, resp. the waterlayer to take a 

 brighter tinge. When two ions are united with a brace, we wish 

 to express that the difference of colour was too small to decide 

 about their sequence. 



Crystal violet. 

 [H,0] 'TO, "SO/ 'CI 'Br 'NO, 'I 'CNS 



Fuchsine. 

 [H,0] "SO, "TO, 'CI 'Br 'NO. 'I 'CNS 



Methylene blue. . 

 [H,0] "SO, "PO, ^ 'CI 'Br 'NO, 'I 'CNS 



The first thing that strikes us is the fact that the ions are placed 

 in the sequence of the so called lyotropic series of anions. The 

 sequence of the ions is the same as regards their influence on the 

 solubility of other bodies; the salting out of proteids; the influence 

 on surface tension; enlargement of swelling; the kinetics of many 

 reactions etc. These three dyes were basic, but when acid ones are 

 taken we can expect the anions to have either no influence at all 

 or an opposite one. Indeed we found such an influence though 

 very weak. 



Naiihtoiyellow S. 

 . r 'Br [H,OJ "SO, '"PO, 



Alcaliblue. 

 [H,0] 'I 'Br "SO, '"PO, 



3. Pelet's theory of dyeing suggests an increasing adsorption of 

 basic dyes when NaCl, still more when Na^SO, and even much more 

 when Na^HPO^ is added to the dyeing tub; we found however that 

 the adsorption by the alcohol was not increased according to the 



1) We only used NH^GNS in staed of NaCNS. 



