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Silver(I,III) oxide
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<p>Silver(I,III) oxide or tetrasilver tetroxide is the <a href="/facts/Inorganic_compound/TfFfzxSz">inorganic compound</a> with the formula Ag4O4. It is a component of <a href="/facts/Silver_zinc_battery/J3asKoeE">silver zinc batteries</a>. It can be prepared by the slow addition of a silver(I) <a href="/facts/Salt_(chemistry)/lsSKwGpn">salt</a> to a <a href="/facts/Persulfate/IlAYjLH8">persulfate</a> <a href="/facts/Solution_(chemistry)/MGchhMQV">solution</a> e.g. <a href="/facts/Silver_nitrate/U5w4A3DN">AgNO3</a> to a <a href="/facts/Sodium_persulfate/Fxbfk9QI">Na2S2O8</a> solution. It adopts an unusual structure, being a <a href="/facts/Mixed-valence_compound/N5Ru4JCw">mixed-valence compound</a>. It is a dark brown solid that decomposes with evolution of O2 in water. It dissolves in concentrated <a href="/facts/Nitric_acid/UDbwGp6s">nitric acid</a> to give brown solutions containing the Ag2+ ion. </p>