| prov:value
| - Suitable anions An.sup.??? include organic as well as inorganic anions, for example chloride, bromide, sulfate, hydrogensulfate, methosulfate, phosphate, borotetrafluoride, carbonate, bicarbonate, oxalate, formate, acetate, propionate, lactate or complex anions, such as the anion of zinc chloride double salts.
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