CLARK: REDUCTION POTENTIALS 



265 



TABLE 5— (Continued) 



Cc. Ti 

 solution 



9.0 

 10. 



10.5 

 10.7 

 10.9 

 II .0 



Per cent 

 reduction 



81 

 90 

 95 

 97 

 99 

 100 



1208 

 1321 

 1438 

 1533 

 1737 

 198 



Average, 



lOIO 



TABLE 6 



Titration of Indigo by Titanium at Ph 8.58 



Buffer Solution: M/io Borate, lf/40 Citrate with HCl 



Co. Ti 

 solution 



0.0 

 1 .0 

 2.0 

 30 

 4.0 

 50 

 6.0 

 7.0 

 8.0 

 9.0 

 10. o 



II. o 

 12 .0 



Per cent 

 reduction 



0.0 



8.3 

 16.7 

 250 

 33-3 

 41-7 

 50.0 



58.3 

 66.7 

 750 



833 



91.7 



100. o 



+0 



074 



1266 



1398 



1466 



1518 



1563 



1603 



1647 



1694 



1743 

 1814 



1931 

 2438 



0.03 log 

 ox/red. 



+0 . 03 1 2 

 +0.0210 

 +0.0143 

 +0 . 0090 

 +0 . 0044 

 +0 . 0000 

 — o . 0044 

 — O . 0090 

 —0.0143 

 — 0.0210 



O . 03 1 2 



End point 



—(0.1578) 

 — o. 1608 

 — o. 1609 



1608 



-o. 1607 



-0.1603 

 -0.1603 



-o. 1604 

 1600 

 — o. 1604 

 -(o. 1619) 



Average, — o . 1 609 



TABLE 7 

 Reduction op Methylene Blue by Titanium at Ph 1-55 

 Buffer Solution: M/io KCl with HCl 



