at the Electrodes in a Solution. 61 



c — c being always positive, this inequality can also be 



written 



__ 1*1284 n' . ft _anf iH 

 <c -c) - 9654Q iy K y65402/c K > 



where e is a number smaller than 1. The values of i \f_ =?> 

 obtained from this quadratic equation are 



10" 



\Zk = 5 ' UlK aW(>- U7 a) 2 - 93 ' 20 



(c —c)eK 

 n'a 



Now as we know that for t = 0, also c — c = 0, we con- 

 clude that only the negative sign before the square root is 



applicable. Remembering also that — is always greater 



than the value l — n c of equation (12), we can transform 

 this equation into the inequality 



ioWe <5 - 4 <-V( 5 - 



447-) 



a J 



93-20 '^^P ; (15) 

 (l-n> 



the dimension of the number 5*447 occurring here is 



amp. x sec. t . , . , t ,,. milliamp. x sec. 



— '- : — or, which is the same thing, — : , 



g.-equiv. mg.-eqmv. ' 



and the dimension of the number 93*20 is ( ^— r^ — ' ) . 



\ mg.-eqmv. / 



In the following Table (I.) I have given the concentrations 



of the solutions examined experimentally in g. -equivalents per 



litre, or, which is the same thing, in — — — % — '. They have 



& cm. 3 J 



been made to correspond to solutions examined by Schrader*. 



The concentrations given by him have a slightly different 



meaning to mine, as his indicate the number of g.-equivalents 



contained in the copper-sulphate crystals which were dissolved 



in one litre of pure water. The quantities a, /?, and k, given 



by Schrader, as well as the values for a taken from Kohl- 



rausch's tables, which have been used, will also be found in 



the table. Under the headings " i\ max." and "i 2 t mm." 



will be found the maximum and minimum values of i 2 t . 



calculated from the expressions (15) and (14) respectively, 



t being the time required for e to go down to zero. In the 



column marked '* i' 2 t ace. to (16) " I have given values of 



iH derived from the formula 



1*1284,., x . /T 



-^7TFTX(1— n c )l\y =g., . . . . (lb) 



96540 

 * Zeitschv. f. Elektrochem. iii. p. 502. 



