m Chembox: rm/replace deprecated params. Fix unknown parameters (via AWB script) |
m fixed citation template(s) to remove page from Category:CS1 maint: Extra text & general fixes using AWB (11334) |
||
Line 58: | Line 58: | ||
==Preparation== |
==Preparation== |
||
Potassium periodate can be prepared by the oxidation of an aqueous solution of [[potassium iodate]] by [[chlorine]] and [[potassium hydroxide]].<ref>{{cite book|last=Riley|first=edited by Georg Brauer ; translated by Scripta Technica, Inc. Translation editor Reed F.|title=Handbook of preparative inorganic chemistry. Volume 1|date=1963|publisher=Academic Press|location=New York, N.Y.|isbn=978-0121266011|page=325|edition=2nd |
Potassium periodate can be prepared by the oxidation of an aqueous solution of [[potassium iodate]] by [[chlorine]] and [[potassium hydroxide]].<ref>{{cite book|last=Riley|first=edited by Georg Brauer ; translated by Scripta Technica, Inc. Translation editor Reed F.|title=Handbook of preparative inorganic chemistry. Volume 1|date=1963|publisher=Academic Press|location=New York, N.Y.|isbn=978-0121266011|page=325|edition=2nd}}</ref> |
||
:[[ |
:[[Potassium iodate|KIO<sub>3</sub>]] + Cl<sub>2</sub> + 2 KOH → KIO<sub>4</sub> + 2 KCl + H<sub>2</sub>O |
||
It can also be generated by the [[electrochemical]] oxidation of [[potassium iodate]], however the low solubility of KIO<sub>3</sub> makes this approach of limited use. |
It can also be generated by the [[electrochemical]] oxidation of [[potassium iodate]], however the low solubility of KIO<sub>3</sub> makes this approach of limited use. |
||
==Chemical Properties== |
==Chemical Properties== |
||
Potassium periodate decomposes at 582 |
Potassium periodate decomposes at 582 °C to form [[potassium iodate]] and [[oxygen]]. |
||
The low solubility of KIO<sub>4</sub> makes it useful for the determination of potassium and [[cerium]]. |
The low solubility of KIO<sub>4</sub> makes it useful for the determination of potassium and [[cerium]]. |
||
Line 71: | Line 71: | ||
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. |
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. |
||
KIO<sub>4</sub> forms [[tetragonal]] crystals of the Scheelite type ([[space group]] ''I''4<sub>1</sub>/<sub>a</sub>).<ref>{{cite journal|last=Al-Dhahir|first=T.A.|author2=Dhanaraj, G. |author3=Bhat, H.L. |title=Growth of alkali metal periodates from silica gel and their characterization|journal=Journal of Crystal Growth|date=June 1992|volume=121|issue=1-2|pages=132–140|doi=10.1016/0022-0248(92)90182-I}}</ref> |
KIO<sub>4</sub> forms [[tetragonal]] crystals of the Scheelite type ([[space group]] ''I''4<sub>1</sub>/<sub>a</sub>).<ref>{{cite journal|last=Al-Dhahir|first=T.A.|author2=Dhanaraj, G. |author3=Bhat, H.L. |title=Growth of alkali metal periodates from silica gel and their characterization|journal=Journal of Crystal Growth|date=June 1992|volume=121|issue=1-2|pages=132–140|doi=10.1016/0022-0248(92)90182-I}}</ref> |
||
==References== |
==References== |
||
{{Reflist}} |
{{Reflist}} |
||
{{Potassium compounds}} |
{{Potassium compounds}} |
||
Line 82: | Line 81: | ||
[[Category:Potassium compounds]] |
[[Category:Potassium compounds]] |
||
[[Category:Oxidizing agents]] |
[[Category:Oxidizing agents]] |
||
{{inorganic-compound-stub}} |
{{inorganic-compound-stub}} |
Revision as of 23:32, 5 August 2015
Names | |
---|---|
IUPAC name
Potassium periodate
| |
Other names
potassium metaperiodate
| |
Identifiers | |
3D model (JSmol)
|
|
ChemSpider | |
ECHA InfoCard | 100.029.269 |
EC Number |
|
PubChem CID
|
|
CompTox Dashboard (EPA)
|
|
| |
| |
Properties | |
KIO4 | |
Molar mass | 230.00 g mol−1 |
Appearance | white crystaline powder |
Odor | odourless |
Density | 3.618 g/cm3 |
Melting point | 582 °C (1,080 °F; 855 K) (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) | |
Structure | |
tetragonal | |
Hazards | |
Occupational safety and health (OHS/OSH): | |
Main hazards
|
Oxidant |
NFPA 704 (fire diamond) | |
Safety data sheet (SDS) | External MSDS |
Related compounds | |
Other anions
|
Potassium iodide Potassium iodate |
Other cations
|
Sodium periodate |
Related compounds
|
Periodic acid |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|
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.
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
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).[2]
References
- ^ 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. ISBN 978-0121266011.
{{cite book}}
:|first=
has generic name (help)CS1 maint: multiple names: authors list (link) - ^ 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.