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|Section2= |Section3= |Section7= |Section8= }} Sodium periodate is an inorganic salt, composed of a sodium cation and the periodate anion. It may also be regarded as the sodium salt of periodic acid. Like all periodates it can exist in two different forms: sodium ''meta''periodate, which has the formula NaIO4, and sodium ''ortho''periodate, normally this means sodium hydrogen periodate (Na2H3IO6) but the fully reacted sodium orthoperiodate salt, Na5IO6, can also be prepared. Both salts are useful oxidising agents.〔Andrew G. Wee, Jason Slobodian, Manuel A. Fernández-Rodríguez and Enrique Aguilar "Sodium Periodate" e-EROS Encyclopedia of Reagents for Organic Synthesis 2006. 〕 ==Preparation== Classically, periodate was most commonly produced in the form of sodium hydrogen periodate (Na3H2IO6).〔 This is commercially available, but can also be produced by the oxidation of iodates with chlorine and sodium hydroxide. Or, similarly, from iodides by oxidation with bromine and sodium hydroxide: :NaIO3 + Cl2 + 4 NaOH → Na3H2IO6 + 2 NaCl + H2O :NaI + 4 Br2 + 10 NaOH → Na3H2IO6 + 8 NaBr + 4 H2O Modern industrial scale production involves the electrochemical oxidation of iodates, on a PbO2 anode, with the following standard electrode potential: :H5IO6 + H+ + 2 e− → IO3− + 3 H2O 1.6 E° Sodium metaperiodate can be prepared by the dehydration of sodium hydrogen periodate with nitric acid. :Na3H2IO6 + 2 HNO3 → NaIO4 + 2 NaNO3 + 2 H2O 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Sodium periodate」の詳細全文を読む スポンサード リンク
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