| http://www.w3.org/ns/prov#value | - As such an electrolyte, there may be mentioned the one prepared by dissolving from 0.5 to 1.5 M of a solute such as an alkali metal salt, an amine salt or a tetraalkyl ammonium or tetraalkyl phosphonium salt (the counter anion includes a perchloric acid ion, a phosphorus hexafluoride ion, a perfluoroalkylsulfonic acid ion and a boron tetrafluoride ion) in a solvent such as propylene carbonate, ??-
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