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Silver-silver(I) system in superacid mixtures HF+SbF5 |
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| Authors: | J Devynck PL Fabre B Trémillon A Ben Hadid |
| Institution: | 1. Laboratoire d''Electrochimie Analytique et Appliquée (LA 216), Ecole Nationale Supérieure de Chimie de Paris, Université Pierre et Marie Curie, 11, rue Pierre-et-Marie Curie, 75231 Paris Cedex 05 (France);2. Laboratoire de Chimie, Institut National des Sciences et Techniques Nucléaires, Centre d''Etudes Nucléaires de Saclay, B.P. no. 6, 91190 Gif-sur-Yvette (France) |
| Abstract: | An electrochemical study of silver in superacid medium HF+SbF5 shows that Ag is not oxidized and that the couple Ag/Ag(I) may be used as a reference electrode in mixtures of HF and SbF5 containing 30% of SbF5 (by weight). From potentiometric measurements with a silver electrode, it is shown that AgSbF6 is slightly soluble and the solubility product is determined (log(Ks/mol2l?2)=1.1). Evidence for the strong acidity of SbF5 is demonstrated and it is shown that there are no polymers (such as Sb2F11?) in the concentration range 0–3 M of SbF5. |
| Keywords: | To whom correspondence should be addressed |
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