Trichome

thcscience_admin
Browse history interactively
← Previous edit
Content deleted Content added
VisualWikitext
Thricecube (talk | contribs)
Extended confirmed users
30,491 edits
+template
periodates temp
 
(48 intermediate revisions by 32 users not shown)
Line 1: Line 1:
{{chembox
{{chembox
| Watchedfields = changed
| ImageFile =
| verifiedrevid = 464212252
⚫
| ImageSize =
| ImageFile = Potassium periodate.svg
⚫
| ImageSize = 150px
| ImageFile1 = KIO4.jpg
| ImageSize1 =
| IUPACName = Potassium periodate
| IUPACName = Potassium periodate
| OtherNames =
| OtherNames = potassium metaperiodate
| Section1 = {{Chembox Identifiers
|Section1={{Chembox Identifiers
| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
⚫
| CASNo = 7790-21-8
| ChemSpiderID = 128877
⚫
| CASNo_Ref = {{cascite}}
| InChI = 1/HIO4.K/c2-1(3,4)5;/h(H,2,3,4,5);/q;+1/p-1
⚫
| PubChem = 516896
| InChIKey = FJVZDOGVDJCCCR-REWHXWOFAS
| SMILES = [K+].[O-]I(=O)(=O)=O
| StdInChI_Ref = {{stdinchicite|correct|chemspider}}
| StdInChI = 1S/HIO4.K/c2-1(3,4)5;/h(H,2,3,4,5);/q;+1/p-1
| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}
| StdInChIKey = FJVZDOGVDJCCCR-UHFFFAOYSA-M
⚫
| CASNo = 7790-21-8
⚫
| CASNo_Ref = {{cascite|correct|CAS}}
| UNII_Ref = {{fdacite|correct|FDA}}
| UNII = Q3LOC6P66L
⚫
| PubChem = 516896
| EINECS = 232-196-0
}}
}}
| Section2 = {{Chembox Properties
|Section2={{Chembox Properties
| Formula = KIO<sub>4</sub>
| K = 1 | I = 1 | O = 4
⚫
| MolarMass = 230.00 g mol<sup>−1</sup>
| Appearance = white powder
| Appearance = white crystalline powder
⚫
| Density = 3.62 g/cm<sup>3</sup>
| Odor = odourless
⚫
| MeltingPtC = 582
| Density = 3.618 g/cm<sup>3</sup>
| BoilingPt =
⚫
| MeltingPtC = 582
| Solubility = sparingly soluble
| MeltingPt_notes = (decomposes)
| BoilingPtC =
| Solubility = 0.17 g/100 mL (0 °C) <br> 0.42 g/100 mL (20 °C) <br> 4.44 g/100 mL (80 °C) <br> 7.87 g/100 mL (100 °C)
}}
}}
| Section7 = {{Chembox Hazards
|Section3={{Chembox Structure
| CrystalStruct = tetragonal
⚫
| ExternalMSDS = [http://msds.chem.ox.ac.uk/PO/potassium_periodate.html External MSDS]
| EUIndex = Not listed
⚫
| MainHazards = Oxidant
⚫
| FlashPt = Non-flammable
}}
}}
| Section8 = {{Chembox Related
|Section7={{Chembox Hazards
⚫
| ExternalSDS = [http://msds.chem.ox.ac.uk/PO/potassium_periodate.html External MSDS]
⚫
| OtherAnions = [[Potassium iodide]]<br/>[[Potassium iodate]]
⚫
| MainHazards = Oxidant
⚫
| OtherCations = [[Sodium periodate]]
| NFPA-H = 1
⚫
| OtherCpds = [[Periodic acid]]
| NFPA-F = 0
| NFPA-R = 0
| NFPA-S = OX
⚫
| FlashPt =
}}
|Section8={{Chembox Related
⚫
| OtherAnions = [[Potassium iodide]]<br/>[[Potassium iodate]]
⚫
| OtherCations = [[Sodium periodate]]
⚫
| OtherCompounds = [[Periodic acid]]
}}
}}
}}
}}

'''Potassium periodate''' has formula KIO<sub>4</sub>.
'''Potassium periodate''' is an [[inorganic]] salt with the [[molecular formula]] KIO<sub>4</sub>. It is composed of a [[potassium]] [[cation]] and a [[periodate]] [[anion]] and may also be regarded as the potassium [[Salt (chemistry)|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 the '''''meta''periodate''' form; the corresponding '''potassium ''ortho''periodate''' (K<sub>5</sub>IO<sub>6</sub>) 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]].<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>

:{{math|[[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.

==Chemical properties==
Potassium periodate decomposes at 582&nbsp;°C to form [[potassium iodate]] and [[oxygen]].

The low solubility of KIO<sub>4</sub> makes it useful for the determination of potassium{{cn|date=December 2022}} and [[cerium]]. <ref name="Venugopalan">M. Venugopalan and K. J. George: "Determination of cerium by potassium periodate" in ''Naturwissenschaften'', ''43''(15), S. 348–349. {{doi|10.1007/BF00755157}}</ref>


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|bibcode=1992JCrGr.121..132A }}</ref>
The low solubility of KIO<sub>4</sub> makes it useful for the determination of potassium.


==References==
Note that the pronunciation is per-iodate, not period-ate.
{{reflist}}


{{Potassium compounds}}
{{Potassium compounds}}
{{Periodates}}


[[Category:Periodates]]
[[Category:Periodates]]
[[Category:Potassium compounds]]
[[Category:Potassium compounds]]
[[Category:Oxidizing agents]]

{{inorganic-compound-stub}}

[[ar:فوق يودات البوتاسيوم]]
[[de:Kaliumperiodat]]
[[pl:Jodan(VII) potasu]]

Latest revision as of 15:56, 29 February 2024

Potassium periodate
Names
IUPAC name
Potassium periodate
Other names
potassium metaperiodate
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.029.269 Edit this at Wikidata
EC Number
  • 232-196-0
UNII
  • InChI=1S/HIO4.K/c2-1(3,4)5;/h(H,2,3,4,5);/q;+1/p-1 checkY
    Key: FJVZDOGVDJCCCR-UHFFFAOYSA-M checkY
  • InChI=1/HIO4.K/c2-1(3,4)5;/h(H,2,3,4,5);/q;+1/p-1
    Key: FJVZDOGVDJCCCR-REWHXWOFAS
  • [K+].[O-]I(=O)(=O)=O
Properties
KIO4
Molar mass 230.00 g mol−1
Appearance white crystalline 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)
NFPA 704 four-colored diamondHealth 1: Exposure would cause irritation but only minor residual injury. E.g. turpentineFlammability 0: Will not burn. E.g. waterInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazard OX: Oxidizer. E.g. potassium perchlorate
1
0
0
OX
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).
checkY verify (what is checkY☒N ?)

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 the metaperiodate form; the corresponding potassium orthoperiodate (K5IO6) has never been reported.

Preparation[edit]

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[edit]

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[citation needed] and cerium. [2]

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).[3]

References[edit]

  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. ISBN 978-0121266011. {{cite book}}: |first= has generic name (help)CS1 maint: multiple names: authors list (link)
  2. ^ M. Venugopalan and K. J. George: "Determination of cerium by potassium periodate" in Naturwissenschaften, 43(15), S. 348–349. doi:10.1007/BF00755157
  3. ^ 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. Bibcode:1992JCrGr.121..132A. doi:10.1016/0022-0248(92)90182-I.
source: https://en.wikipedia.org/w/index.php?title=Potassium_periodate&diff=1211049264&oldid=272883407

Leave a Reply