The halogen of lower atomic weight can displace one of higher atomic weight from its hydrogen compound, or from the salt derived from such hydrogen compound, while, on the other hand, the halogen of higher atomic weight can displace that of lower atomic weight, from the halogen oxy-acids and their salts; thus iodine will liberate chlorine from potassium chlorate and also from perchloric acid.
It can be prepared by the action of iodine on perchloric acid, or by boiling normal silver periodate with water: 2AgIO 4 +4H 2 O = Ag 2 H 3 10 6 +H10 4.2H 2 0.
Gay Lussac investigated chloric acid; Stadion discovered perchloric acid, since more fully studied by G.
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