The hydrogen-ion concentration of pure water near 25 C. 



Zts. physik. Chem., 1893, 72:521. 



Hbid., 1893. 21:823; see also Shields, ibid., 1893, 



If:184. 



cibid., 1893, 12:492. 

 dlbid., 1893, 11:829; see Arrhenius, ibid., 1890, 



5:19, and Walker, 1889, 4:334. 

 e lbid., 1893, 12:514. 



flbid., 1894, 14:155. A new theory of this method 

 is there given by Nernst. 



eibid , 1894, 14:330. 



h lbid., 1896,20:293 



1 Carnegie Institution of Washington, 1907, Pub- 

 lication 63, p 297. 



The accuracy of the method which is here described for measuring 

 the electrolytic dissociation of water depends primarily on the accuracy 

 with which the difference & w A can be measured. For glucose this 

 difference is only 10 per cent of the separate quantities, and conse- 

 quently the accuracy of the method is not great, probably about 20 per 

 cent, but from recent measurements which the writer a has made on the 

 rate of mutarotation of the related sugar fructose in pure water and 

 acid solutions, it appears that the above difference for this sugar is far 

 greater than for glucose, being over 40 per cent of the separate quanti- 

 ties. Measurements on fructose will, therefore, in all probability give 

 with closer accuracy the electrolytic dissociation of water. 



J. Amer. Chem. Soc., 1908, 30:1578. 



o 



