Abstract
The behaviour of methanesulfonic and 2,5-dichlorobenzenesulfonic acids in a 20 mass% propylene carbonate (PC) +ethylene carbonate (EC) mixture has been investigated by means of conductance and potentiometric measurements at 25°C. The conductance behaviour of acids in 20 mass% PC+EC is explained on the basis of simple dissociation (HA⇌H+ +A−) and homoconjugation (HA+A− ⇌HA−2) equilibria. The results of the measurements have been subsequently correlated with potentiometric studies involving the cell: Pt|H2(1 atm), HA in 20 mass% PC+EC∭HgCl2(s)|Hg ref. in 20 mass% PC+EC. In addition, the Hg | HgCl2(s) reference electrode has been used to determine the standard potential of the reaction: quinone+ 2H+ + 2e− ⇌hydroquinone vs. SHE in 20 mass% PC+EC. It was found to be 0.3516 ± 0.0023 V.
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