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NaIO 3 sodium iodate + Cl 2 + 4 NaOH ⟶ Na 3 H 2 IO 6 + 2 NaCl + H 2 O {\displaystyle {\ce {{\overset {sodium\ iodate}{NaIO3}}+Cl2{}+4NaOH->Na3H2IO6{}+2NaCl{}+H2O}}} NaI + 4 Br 2 + 10 NaOH ⟶ Na 3 H 2 IO 6 + 8 NaBr + 4 H 2 O {\displaystyle {\ce {NaI + 4 Br2 + 10 NaOH -> Na3H2IO6 + 8 NaBr + 4 H2O}}} Record of Natriumperiodat in the GESTIS Substance Database of the Institute for Occupational Safety and Health, accessed on 2018-01-08. Modern industrial scale production involves the electrochemical oxidation of iodates, on a lead dioxide ( PbO 2) anode, with the following standard electrode potential: 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 many periodates, it can exist in two different forms: sodium metaperiodate (formula‍NaIO 4) and sodium orthoperiodate (normally Na 2H 3IO 6, but sometimes the fully reacted salt Na 5IO 6). Both salts are useful oxidising agents. [2] Preparation [ edit ] Periodate can exist in a variety of forms in aqueous media, with pH being a controlling factor. Orthoperiodate has a number of acid dissociation constants. [5] [6] H 5 IO 6 ↽ − − ⇀ H 4 IO 6 − + H + {\displaystyle {\ce {H5IO6 <=> H4IO6- + H+}}} p K a = 3.29 H 4 IO 6 − ↽ − − ⇀ H 3 IO 6 2 − + H + {\displaystyle {\ce {H4IO6- <=> H3IO6

Hill, Arthur E. (October 1928). "Ternary Systems. VII. The Periodates of the Alkali Metals". Journal of the American Chemical Society. 50 (10): 2678–2692. doi: 10.1021/ja01397a013. Periodate / p ə ˈ r aɪ . ə d eɪ t/ is an anion composed of iodine and oxygen. It is one of a number of oxyanions of iodine and is the highest in the series, with iodine existing in oxidation state +7. Unlike other perhalogenates, such as perchlorate, it can exist in two forms: metaperiodate IO − Sodium metaperiodate can be prepared by the dehydration of sodium hydrogen periodate with nitric acid. [3] Na 3 H 2 IO 6 + 2 HNO 3 ⟶ NaIO 4 + 2 NaNO 3 + 2 H 2 O {\displaystyle {\ce {Na3H2IO6 + 2 HNO3 -> NaIO4 + 2 NaNO3 + 2 H2O}}} Structure [ edit ] Sodium metaperiodate (NaIO 4) forms tetragonal crystals ( space group I4 1/ a) consisting of slightly distorted IO −

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McMurry, John. Organic chemistry (8th ed., [international ed.]ed.). Singapore: Brooks/Cole Cengage Learning. pp.285–286. ISBN 9780840054531. In this regard it is comparable to the tellurate ion from the adjacent group. It can combine with a number of counter ions to form periodates, which may also be regarded as the salts of periodic acid. H 5 IO 6 + H + + 2 e − ⟶ IO 3 − + 3 H 2 O {\displaystyle {\ce {H5IO6 + H+ + 2e- -> IO3- + 3 H2O}}} E° = 1.6 V [5] Betz, T.; Hoppe, R. (May 1984). "Über Perrhenate. 2. Zur Kenntnis von Li 5ReO 6 und Na 5ReO 6 – mit einer Bemerkung über Na 5IO 6". Zeitschrift für anorganische und allgemeine Chemie (in German). 512 (5): 19–33. doi: 10.1002/zaac.19845120504.

ions with average I–O bond distances of 1.775Å; the Na + ions are surrounded by 8 oxygen atoms at distances of 2.54 and 2.60Å. [6] H 5 IO 6 + H + + 2 e − ⟶ IO 3 − + 3 H 2 O {\displaystyle {\ce {H5IO6 + H+ + 2e- -> IO3- + 3 H2O}}} E° = 1.6 V [4]Metaperiodates are typically prepared by the dehydration of sodium hydrogen periodate with nitric acid, [2] or by dehydrating orthoperiodic acid by heating it to 100 °C under vacuum. Classically, periodate was most commonly produced in the form of sodium hydrogen periodate ( Na 3H 2IO 6). [2] This is commercially available, but can also be produced by the oxidation of iodates with chlorine and sodium hydroxide. [3] Or, similarly, from iodides by oxidation with bromine and sodium hydroxide: NaIO 3 + NaOCl sodium hypochlorite ⟶ NaIO 4 + NaCl {\displaystyle {\ce {NaIO3{}+{\overset {sodium\ hypochlorite}{NaOCl}}->NaIO4{}+NaCl}}} Forms and interconversion [ edit ] Sodium hydrogen periodate (Na 2H 3IO 6) forms orthorhombic crystals (space group Pnnm). Iodine and sodium atoms are both surrounded by an octahedral arrangement of 6 oxygen atoms; however the NaO 6 octahedron is strongly distorted. IO 6 and NaO 6 groups are linked via common vertices and edges. [7]