Potassium periodate

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Potassium periodate
Names
IUPAC name
Potassium periodate
Other names
Periodic acid potassium salt
Potassium metaperiodate
Properties
KIO4
Molar mass 230.00 g/mol
Appearance White crystalline solid
Odor Odorless
Density 3.618 g/cm3
Melting point 582 °C (1,080 °F; 855 K) (decomposition)
Boiling point Decomposes
0.17 g/100 ml (0 °C)
0.42 g/100 ml (20 °C)
4.44 g/100 ml (80 °C)
7.87 g/100 ml (100 °C)
Vapor pressure ~0 mmHg
Hazards
Safety data sheet Sigma-Aldrich
Flash point Non-flammable
Related compounds
Related compounds
Potassium iodide
Potassium iodate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Potassium periodate is an inorganic salt with the molecular formula KIO4.

Unlike other common periodates, such as sodium periodate and periodic acid, it is only available in the metaperiodate form; the corresponding potassium orthoperiodate (K5IO6) has never been reported.

Properties

Chemical

Potassium periodate decomposes at 582 °C to form potassium iodate and oxygen.

KIO4 → KIO3 + ½ O2

Manganese dioxide can be used to decompose KIO4, by heating its aqueous solution.

Potassium periodate can be used to prepare copper(III) compounds.

Physical

Potassium periodate is a white crystalline solid, poorly soluble in water.

Availability

It is sold by chemical suppliers.

Preparation

Potassium periodate can be prepared by the oxidation of an aqueous solution of potassium iodate by chlorine and potassium hydroxide.[1]

KIO3 + Cl2 + 2 KOH → KIO4 + 2 KCl + H2O

Projects

  • Determination of potassium and cerium
  • Oxidizing agent
  • Preparation of Cu(III) compounds

Handling

Safety

Potassium poriodate is irritant and a strong oxidizer.

Storage

In closer, airtight containers.

Disposal

Cane be reduced to potassium iodide and recycled.

References

  1. Riley, edited by Georg Brauer ; translated by Scripta Technica, Inc. Translation editor Reed F. (1963). Handbook of preparative inorganic chemistry. Volume 1 (2nd ed.). New York, N.Y.: Academic Press. p. 325

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