Certain Metals in Dissolved Iodine. 213 



With the more strongly acid solutions it is necessary to 

 prevent oxidation of the iodide by the air. All experiments 

 of the present investigation in which the acidity of the solution 

 was greater than O'l normal were therefore carried out in an 



Table III. 



Metal : Iron. KI 0"5 normal. Temperature 25°. r = 170. 



H Q S0 4 0-02 normal (except in experiments 1, 10, and 11). 



Common Wrought Iron. 

 *1. v = 580 560 540 520 500 480 



At= 10 10 11 10 11 10 



c = 1996 17-67 15-67 13-50 11-88 10-12 8'77 



K= 707 6-71 7-32 6-85 7-09 6"87 Average, 6' 99 



2. K= 6-82 7-01 6-89 7-01 7-15 7-02 Av. 698 



Sivedish Iron. 



3. K= 6-75 6-76 7"08 658 6'93 6-82 Av. 6'82 



4. K= 6-68 6-90 7-19 6-64 7-00 7-08 Av. 692 



" American Ingot Iron." 



5. At= 10 10 10 10 10 10 



c = 20-18 17.95 15-91 14-02 12-38 10-81 9"44 



K= 6-78 6-75 683 6-46 6-77 6-49 Av. Q68 



6. Af= 10 10 10 10 10 10 



c = 18-97 16-83 14-92 13-18 11-57 1010 8-79 



K= 6-94 6-74 669 6-77 6-79 6-66 Av. 677 



7. At= 10 11 13 13 17 20 



c = 17-95 1603 14-04 11-99 10-17 8-14 6-18 



K= 6-56 6-73 6-55 658 6-54 650 Av. 659 



8. At= 14 10 10 13 12 24 



c= 2054 17-40 15-43 13-59 11-54 9-77 6-98 



K= 6-87 6-71 6-86 6-53 6-93 6-72 Av. 677 



9. At = 10 10 12 10 10 5 13 



c-- 19-40 17-25 15-25 13-04 11-45 lost 9-29 7'68 



K= 6-80 6-89 7-04 6-76 6-87 6-72 



Av. 6'85 



10. H 2 S0 4 0-1 normal. 



M= 10 10 10 10 10 10 



c = 19-55 17-40 15-39 13-55 11-93 10-48 9-00 

 K= 6-75 6-86 6'87 6-61 6-46 (7-31) Av. 6'71 



11. H 2 S0 4 0-1 normal. 



At= 10 10 11 10 10 10 



c = 19-35 17-25 15-30 13-28 11-74 10-24 8-91 



K= 6-66 6-71 6-94 6-40 6-83 6-67 Av. 670 



*HC1 0-02 normal, instead of H a S0 4 . 



