262 



cIvArk: reduction potentials 



TABLE I — {Continued) 



Cc. Ti 



solution 



8.0 



9.0 



10.0 



11 .0 



12 .0 

 13.0 

 14.0 

 15.0 



15-5 

 15.6 



15-7 



Per cent 

 reduction 



+0.2070 

 +0.2035 

 +0 . 2000 

 +0. 1 96 1 

 +0. I9I7 

 +0. 1859 

 +0.1784 

 +0.1657 

 +0.1505 



End point 

 +0.1414 



0.03 1 g 

 ox. /red. 



0007 

 0041 

 0076 

 01 14 



0157 

 0210 

 0283 



+0.2077 

 +0.2076 

 +0.2076 

 +0.2075 

 +0.2074 

 +0.2069 

 +0. 2067 



Average, +0 . 2076 



TABLE 2 



Reduction of Indigo by Titanium at Ph 2.45 



Buffer Solution: M/io Citrate with HCl 



