Abstract
Abstract The silver electrode permits investigations of precipitation and complex-formation reactions in liquid anhydrous hydrogen fluoride (AHF) by potentiometric titrations using AgF solutions as titrants. The weaker solvation of the silver ion by HF relative to H2O accounts for the low solubility in AHF of salts like AgTaF6, AgSbF6 etc., as well as the formation of the sparingly soluble silver halides and silver sulfide. The complexes Ag(PH3)+ and Ag(PH3)2 + are formed from Ag+ and PH4 + in AHF. The formation of Ag(AsH3)2 + is observed on titration of AsH3, and with HCN the well known Ag(HCN)2 + complex is obtained. Carbon monoxide and PF3 form weak 1:1 complexes with Ag+. In the presence of AgCl and HCl the silver electrode acts as a fluoride ion electrode which served for the investigation of fluoro-complex formation of NbF5 and TaF5 with fluoride ion. The difference between the standard potentials E° Ag/Ag+ and E° H2/H+(1MF−) was re-determined.
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