| http://www.w3.org/ns/prov#value | - In general, it is not necessary to add an acid, if iron (III) chloride is used, since aqueous solutions of Iron (III) chloride can be sufficiently acid, Only after mixing, the pH is raised to values of e.g. in the order of at least 5, for example up to 11 , 12, 13 or 14.
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