318 



Win Name and Hill — Solution of Metals 



of solution to l>e analyzed, together with a little phosphoric 

 acid. The concentration of chromic acid is measured, in terms 

 of the ferrous sulphate solution, by the expression 20 — xo, in 

 winch x is the volume of the ferrous sulphate equivalent to 

 1 cm 3 of the permanganate. This expression was used in cal- 

 culating the velocity constants. 



( 'uiliuium and Copper. — Table IX gives the results obtained 

 with cadmium and with copper in solutions 025, 1*25, and 5 



Table IX. 



CrOs , 0-015 molar. 



Cadmium. 



No. of 

 Exp. 



UvSo,, 0-25 molar. 











K 



1.* 



/■ = 



580 560 540 



520 



500 



480 



460 







A( = 



10 10 10 



10 



10 



10 



10 







c = 



4811 42-68 37-74 33 



14 2896 25-13 21' 



72 



18-60 





fcj = 



6-94 6-88 7-02 



7-00 



7-08 



6-99 



7-13 







fc = 



6-96 6-88 7-02 



7-00 



7-08 



6-99 



7-13 



701 



■ > * 



fc = 



7-04 7-13 7-00 

 H2SO4 , 1'25 molar. 



7 'OS 



6-99 



7-00 



7-05 



7 04 



3. 



k = 



5-16 5-41 5-31 

 H2SO4 , 5 molar. 



5-29 



5-47 



5-23 



5-37 



5-32 



4. 



: 



cm 3 KMnOi=0-388 cm 3 FeS0 4 . 













V = 



580 560 540 



520 



500 



480 



460 







M = 



10 10 10 



11 



9 



10 



10 







c = 



6-25 832 10-28 12 



30 14-50 16 



22 18-14 2003 





fcx = 



271 2-60 2-71 



273 



2-63 



2-6S 



2-68 







k = 



2-71 2-59 271 



2-73 



2-63 



2-69 



2-68 



2-68 



5. 



fc.= 



2-64 2-61 2-70 

 H a SO*, 0-05 molar. 



2-57 



2-72 



2-70 



2-58 



265 



6.* 



k = 



8'59 • 8-54 8-33 



7-94 



8-23 



7-54 



7-81 



814 



7.* 



fe'= 



8-48 8-65 8-16 



7-82 



7-82 



7-89 



7-39 



803 







* Chromic acid determined by iodometric method. 











Co%>per. 















EUSC-4, 0"25 molar. 













8. 



7.' = 



7-18 6-79 7-06 



7-05 



6-73 



7-21 



6-95 



700 



9. 



k = 



6-75 6-96 6-91 



7-07 



6-88 



6-84 



6-87 



690 



10. 



k = 



6-96 6-86 6-95 

 H 2 SO-4, 1-25 molar. 



6-99 



7-00 



7-09 



6-85 



696 



11. 



k = 



5 47 5-29 5-39 

 HqSO-4 , 5 molar. 



5-31 



5-34 



5-23 



5-36 



534 



12. 



k = 



2-73 2-67 2-72 



2-73 



2-78 



2-72 



2-76 



273 



13. 



k = 



2-71 2-64 2-76 



2-75 



2-76 



2-69 



2-67 



271 



HsSO-4, 0-05 molar. 



14. k = 



2-44 



4-02 



5-50 



6-20 



6-76 



7-02 



7-11 



5-58 



