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Chromate : ウィキペディア英語版
Chromate and dichromate

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Chromate salts contain the chromate anion, CrO42−. Dichromate salts contain the dichromate anion, Cr2O72−. They are oxoanions of chromium in the oxidation state +6. They are moderately strong oxidizing agents. In an aqueous solution, chromate and dichromate ions can be interconvertible.
== Chemical properties ==
Chromates react with hydrogen peroxide giving products in which peroxide, O22−, replaces one or more oxygen atoms. In acid solution the unstable blue peroxo complex Chromium(VI) oxide peroxide, CrO(O2)2, is formed; it is an uncharged covalent molecule which may be extracted into ether. Addition of pyridine results in the formation of the more stable complex CrO(O2)2py.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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