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Names | |
---|---|
IUPAC name
Potassium periodate
| |
Other names
potassium metaperiodate
| |
Identifiers | |
3D model (
JSmol)
|
|
ChemSpider | |
ECHA InfoCard | 100.029.269 |
EC Number |
|
PubChem
CID
|
|
UNII | |
CompTox Dashboard (
EPA)
|
|
| |
| |
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) | |
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 the metaperiodate form; the corresponding potassium orthoperiodate (K5IO6) has never been reported.
Potassium periodate can be prepared by the oxidation of an aqueous solution of potassium iodate by chlorine and potassium hydroxide. [1]
It can also be generated by the electrochemical oxidation of potassium iodate, however the low solubility of KIO3 makes this approach of limited use.
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]
{{
cite book}}
: |first=
has generic name (
help)CS1 maint: multiple names: authors list (
link)
![]() | |
![]() | |
Names | |
---|---|
IUPAC name
Potassium periodate
| |
Other names
potassium metaperiodate
| |
Identifiers | |
3D model (
JSmol)
|
|
ChemSpider | |
ECHA InfoCard | 100.029.269 |
EC Number |
|
PubChem
CID
|
|
UNII | |
CompTox Dashboard (
EPA)
|
|
| |
| |
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) | |
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 the metaperiodate form; the corresponding potassium orthoperiodate (K5IO6) has never been reported.
Potassium periodate can be prepared by the oxidation of an aqueous solution of potassium iodate by chlorine and potassium hydroxide. [1]
It can also be generated by the electrochemical oxidation of potassium iodate, however the low solubility of KIO3 makes this approach of limited use.
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]
{{
cite book}}
: |first=
has generic name (
help)CS1 maint: multiple names: authors list (
link)