between Metals and Dissolved Halogens. 



251 



182. 



:240 



Table X. 



Summary of Velocity Constants. 



A. 



Iodine with Various Metals. 



r 



revs, per 



Concentration of KI 

 grams per liter. 



rnin. 



100 



200 



400 



800 



170 



6-43 (Hg) 

 6-36 (Cd) 



7 '21 (Hg) 



8-14 (Hg) 

 7-95 (Cu) 





180 



7-03* (Zn) 





8-23 (Ag) 





210 





8-54 (Hg) 







240 



8-81 (Hg) . 



8-69 (Cd) 

 8-64 (Zn) 



9-55 (Hg) 



9-56 (Cd) 

 9-64 (Zn) 



10-48 (Hg) 

 9-98 (Cu) 



• 



9-93 (Ag) 



10-27 (Cu) 



300 





11-12 (Hg) 



! 



B. 



Bromine with Mercury. 



400 g. KBr per liter. 



K-- 



| 12-13 

 "j 12-40 



r=160 

 r=215 



Cupric Bromide with Mercury. 

 400 g. KBr per liter iT=4-93 



400 g. KBr per liter K=6S0 



traces of such coatings were observed in some of the experi- 

 ments included in the table, and it is by no means certain that 

 their effect was wholly absent even when no sign of a coating 

 was detected, and the value of K was fairly constant. Further 

 evidence on this point is brought out in the two following tables. 

 Table XI shows the increase in K with the rate of stirring 



as measured by the value of n in the equation 



JL-. /A 



applied to each pair of comparable experiments carried out with 

 one and the same metal. It will be observed that nearly all of 

 the constants in Table X have been used in these calculations, 

 including five of the six which stand alone in Table X and 

 hence can not be directly compared with any others. This is 

 important because a comparison of the values of n affords the 

 best available test of the concordance between these isolated 

 constants and the others. 



