Potentiometric Determination of Fluoride in Toothpaste As a precaution, explain why the tip of the electrode should not come into contact with any solid surface. What is the sign of the slope of Ecell...

Potentiometric Determination of Fluoride in Toothpaste

1. 
   

   
   As a precaution, explain why the tip of the electrode should not come into contact with any solid surface.
   

   
   


2. 
   

   
   What is the sign of the slope of Ecell vs ln[F¯]? Explain why.
   

   
   


3. 
   

   
   Draw CDTA. What kind of error (positive or negative) will be in effect if CDTA is not used?