Abstract
As an application of A. C. polarographic titration with platinum electrode, titration with silver nitrate was attempted. Titration conditions for A. C. polarographic titration require extremely small electrode surface area, large concentration of unrelated electrolyte, and low A. C. cycles. It is considered that the platinum electrode has different surface conditions in A. C. and D. C., and it was found that the silver ion acts as a reaction agent at the electrode, even without addition of an additive like hydrogen peroxide, making it possible to carry out polarographic titration. When the titration conditions are in reverse of those for polarographic titration, the present method of titration tends to be a conductometric titration. It follows, therefore, that the titration curve thought to be intermediate of these two titration methods will be obtained according to the selection of titration conditions. In any case, the present method of titration makes it possible to carry out silver nitrate titration easily. Comparison was made on titration curves to examine titration conditions and considerations were made on the present method of titration.
