Harman Patil (Editor)

Potassium periodate

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Related compounds
  
Periodic acid

Molar mass
  
230 g/mol

Appearance
  
white crystalline powder

Formula
  
KIO4

Density
  
3.62 g/cm³

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Potassium periodate is an inorganic salt with the molecular formula KIO4. It is composed of a potassium cation and a periodate anion and may also be regarded as the potassium salt of periodic acid. Note that the pronunciation is per-iodate, not period-ate.

Contents

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.

Potassium periodate


Preparation

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

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

It can also be generated by the electrochemical oxidation of potassium iodate, however the low solubility of KIO3 makes this approach of limited use.

Chemical Properties

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

The low solubility of KIO4 makes it useful for the determination of potassium and cerium.

It is slightly soluble in water (one of the less soluble of potassium salts, owing to a large anion), giving rise to a solution that is slightly alkaline. On heating (especially with manganese(IV) oxide as catalyst), it decomposes to form potassium iodate, releasing oxygen gas.

KIO4 forms tetragonal crystals of the Scheelite type (space group I41/a).

References

Potassium periodate Wikipedia


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