10450-60-9

PERIODIC ACID is colourless crystals

In dilute solution, periodic acid exists as H⁺ and IO4^-. When more concentrated, orthoperiodic acid, H5IO6, is formed. Note that this compound is essentially a dihydrate, HIO4·2H2O. This can be obtained as a crystalline solid. O-periodic acid can be dehydrated to metaperiodic acid, m-HIO4. Further heating gives di-iodine pentoxide (I2O5) and O2. The anhydride di-iodine heptoxide, i.e. I2O7, does not exist in nature but can be formed synthetically.

In organic synthesis.

PERIODIC ACID is used as an oxidiser and in the determination of manganese.

ChEBI: Orthoperiodic acid is an iodine oxoacid. It is a conjugate acid of an orthoperiodate(1-).

A 100-g quantity of Ba3H4(IO6)2 is moistened with 75 ml H2O and treated with 200 ml of colourless nitric acid. The agitated mixture is heated to 60-70°C for an hour and is then cooled to 30-40°C. The precipitated Ba(NO3)2 is filtered off on a glass frit. The residue is washed free of periodate by stirring with concentrated nitric acid. The combined filtrate is evaporated at 60-70°C in an aspirator vacuum [if more Ba(NO3)s separates, it is filtered, and the evaporation continues] until H5IO6 begins to precipitate. After cooling, glistening crystals of periodic acid are formed. Since the solution tends to become supersaturated, it is often necessary to wait a long time. The crystals are filtered off and dried in a vacuum at 50°C. A second crystal crop may be obtained from the mother liquor by evaporation.

Paraperiodic acid H5IO6, is obtained from sodium paraperiodate, formed by action of chlorine upon a NaOH solution containing I2. On vacuum drying, paraperiodic acid yields metaperiodic acid, HIO4, and dimesoperiodic acid, H4I2O9; which form heteropoly acids with a number of oxides and acids. The periodic acids and their salts are strong oxidizing agents both with inorganic and organic compounds.

Notclassified

reagent type: oxidant

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