Potassium periodate

• Potassium metaperiodate
• Kaliumtetroxoiodat (VII)

Colorless and odorless solid

Fixed

3.62 g · cm -3

582 ° C ( decomposition)

0.51 % ( in water at 25 ° C)

Risk

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Potassium periodate is a chemical compound selected from the group consisting of periodates (specifically, the potassium salt of metaperiodic acid ). It is a white, crystalline solid that dissolves in water is relatively poor.

Production and representation

For the presentation in the laboratory using potassium iodate, which is (conveniently in potassium hydroxide, KOH ) was oxidized using potassium peroxodisulfate in alkaline media:

The reaction is carried out in the boiling solution. Thereafter, the salt may be precipitated by neutralization with half-concentrated nitric acid, washed with ice water and filtered off. Another possibility is the introduction of chlorine in alkaline Kaliumiodatlösung. :

Properties

Potassium periodate is a strong oxidizing agent. As an aqueous solution of potassium iodide of potassium periodate is oxidized to elemental iodine, manganese ( II) salts are oxidized to permanganates.

Its crystals are isomorphous with potassium perchlorate. When dissolved in aqueous potassium hydroxide solution is formed Kaliumdiperiodat, the nitric acid may be recycled back to the basic potassium periodate.

Kaliumorthoperiodat K2H3IO6 which is produced by oxidation of potassium iodate with sodium hypochlorite, at 100 ° C is from water and enters Kaliumdiperiodat.

In aqueous solutions of periodates the following equilibria are:

Use

In addition to its action as an oxidizing agent potassium periodate is used as a reagent for the analytical determination of cerium.