Differential Titration for
K,, Determination
For tho% readers who may usc s. freshman experiment in the determination of the K,, of silver acetate, or the solubilily product constant this writer has made x nsefrd substitut,ion in the endpoirrl determination when titrating for Ag+ i n a satu~.atedd u t i a n of silver acetate. Instead of using an Fe3+ indicator and wstchingfor the resulting FeSCN2+at the endpoint, differential titration using silver electrodes is med. The silver electrodes are easily constructed and dare sen& live to the Ag+ concentralion, and the endpoint of t,he tilrat,ion is clearly defined. llefer to any analytic chemistry textbook ior the details of differential tibration. ALBERT
842
/
Journal o f Chemicol Education
G. KRIGER
