W. MANSFIELD CLARK 



193 



TABLE I 

 Relation of Percentage Reduction to Potential at Constant pH Determined by 



Ei, = E'o- 0.03006 log [|^ at 30° C. 



(Values Rounded to Nearest Millivolt) 



Reduction 



Per Cent 



I 



2 



S 



10 



IS 



20 



25 



30 



35 



40 



45 



50 



-0.03006 log 



[So] 



Volts 



+ 0.060 

 .051 

 .038 

 .029 

 .023 

 .018 

 .014 

 .Oil 



.008 



.005 



+ -003 



+ o . 000 



Reduction 



Per Cent 



55 



60 



65 



70 



75 



80 



85 



90 



QS 



98 



99 



—0.03006 lof; 



fSo) 



Volts 



— o . 003 



.005 



.008 



.oil 



.014 



018 

 .023 



.029 



.038 

 .051 



— 0.060 



TABLE 11 



E'o Values for Several Oxidation-Reduction Indicators, 30° C. 

 (Values Rounded to Nearest Millivolt) 



* Unstable in this region of pH. 



t Decomposes in this region of pH. 



