in Ferric Salts and in Chromic Acid. 



309 



Copper and Silver. — The results obtained with copper and 

 with silver are much alike and can conveniently be considered 

 together. They are recorded in Table V, together with two 

 experiments on the rate of solution of zinc. The silver used 

 was from a sample of high purity which gave no test for cop- 

 per. For the copper disks the best obtainable grade of com- 

 mercial sheet copper was employed, but the sample was not 









Table V. 















R I Fe(S0 4 ) 2 



, 05 molar. 









No. of 

 Exp. 







Copper. 











HSOi, 



0'25 molar 













K 



1. * = 



3 83 



3-58 



3-78 



3-68 



3'54 



3-61 



3-64 



367 



2. k = 



3-76 

 H s SO«, 



3-64 

 1'25 molar 



3-69 



3-60 



3-55 



3 62 



3-51 



362 



3. k = 



3-31 



321 



3-26 



3-22 



3-24 



3'41 



3 02 



3-24 



4. k = 



3 36 

 H2SO4 , 



3 25 

 5 molar. 



322 



3-18 



316 



3-13 



3-02 



319 



5. k = 



1-73 



1-67 



1-64 



1-66 



1-69 



1-46 



1-60 



163 



6. h = 







1-64 



1-68 



1-59 



1-63 



1-63 



1-53 



1*62 



7. k = 



168 



1-66 



1-65 



1-60 



1-61 



1-59 



1-62 



163 



Initial velocities by extrapolation : Exp. 1, 3'75; Exp. 2, 3'73; Exp. 

 , 3-27; Exp. 4, 3-33: Exp. 5, 174; Exp. 6, 1'70; Exp. 7, 169. 



Silver. 



EUSO4, 025 molar. 

 8. k= 1-60 160 1-44 T34 1-29 



EUSO4, 1-25 molar. 

 k = 1-61 1-49 1-35 1-36 T23 



*= 1-61 1-53 1-48 1-41 1-29 



4 grm. Ag 2 S0 4 added at the outset. 

 k - 073 0-63 0-62 059 0'56 



H2SO4 , 5 molar. 

 k== 1-28 1-16 I'll 1-08 1-06 



*= 1-25 1-16 1-17 1-10 1-04 



Initial velocities by extrapolation: Exp. 8, 

 Exp. 10, 1-65; Exp. 12, 1-23; Exp. 13, 1-24. 



9. 

 10. 

 11. 



12. 



13. 



1-19 



1-14 

 1-27 



0-52 



1-06 



1-05 



1-67; Exp. 



1-08 



1-18 

 115 



041 



1-05 

 1-02 



1-36 



134 

 139 



058 



111 

 111 



9, 1-61; 



Zinc. 







H 2 S04 , 



001 molar. 













14. 



k = 



4-41 



4-32 4'35 



4-56 



4-56 



4-57 



5-00 



446 



15. 



k = 



4-27 



4-38 4-13 



4-07 



4-48 



4-34 



4-39 



429 



