26 



HYDROGEN ION CONCENTRATION 



d. The hydrogen ion concentration method. By means of the 

 concentration chains, which are to be described later, the [H+] 

 of any solution may be determined. If the [H+] of a certain NaOH 

 solution of known [0H~] is determined by this method then kw 

 may be calculated. WilheLm Ostwald-" was the first to call atten- 



TABLE 7 



tion to this method; W. Nernst'^ introduced an important correc- 

 tion into the calculations of the method, and since then it has been 

 used by various authors. Lowenherz- found: 



2» Wi. Ostwald, Zeitschr. f. physikal. Chem. 11, 521 (1893). 



21 W. Nernst, Zeitschr. f. physikal. Chem. 14, 155 (1894). 



^2 R. Lowenherz, Zeitschr. f. physikal. Chem. 20, 283 (1896). 



