| http://www.w3.org/ns/prov#value | - (c) a water-soluble salt of an inroganic oxyacid or an aliphatic or aromatic mono- or polycarboxylic acid, optionally substituted by hydrocarbon groups or functional groups other than halogen atoms, and which possesses an ionization constant pKa of less than 2.5, in water at 25??? C.
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