|Jmol-3D images||Image 1|
|Molar mass||230.00 g mol−1|
|Appearance||white crystaline powder|
|Melting point||582 °C (1,080 °F; 855 K) (decomposes)|
|Solubility in water||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)
|EU Index||Not listed|
|Other anions||Potassium iodide
|Other cations||Sodium periodate|
|Related compounds||Periodic acid|
|Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)|
|(what is: / ?)|
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.
Unlike other common periodates, such as sodium periodate and periodic acid, it is only available in in the metaperiodate form; the corresponding potassium orthoperiodate (K5IO6) has never been reported.
- KIO3 + Cl2 + 2 KOH → KIO4 + 2 KCl + H2O
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.
- Riley, edited by Georg Brauer ; translated by Scripta Technica, Inc. Translation editor Reed F. (1963). Handbook of preparative inorganic chemistry. Volume 1 (2nd ed. ed.). New York, N.Y.: Academic Press. p. 325. ISBN 978-0121266011.
- Al-Dhahir, T.A.; Dhanaraj, G.; Bhat, H.L. (June 1992). "Growth of alkali metal periodates from silica gel and their characterization". Journal of Crystal Growth 121 (1-2): 132–140. doi:10.1016/0022-0248(92)90182-I.
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