Names | |
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Other names
Iodic acid, sodium salt
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Identifiers | |
3D model (
JSmol)
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ChEBI | |
ChemSpider | |
ECHA InfoCard | 100.028.793 |
EC Number |
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KEGG | |
PubChem
CID
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RTECS number |
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UNII | |
CompTox Dashboard (
EPA)
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Properties | |
INaO3 | |
Molar mass | 197.891 g·mol−1 |
Appearance | White orthorhombic crystals |
Odor | Odorless |
Density | 4.28 g/cm3 |
Melting point | 425 °C (797 °F; 698 K) (anhydrous) decomposes [3] 19.85 °C (67.73 °F; 293.00 K) (pentahydrate) |
2.5 g/100 mL (0 °C) 8.98 g/100 mL (20 °C) 9.47 g/100 mL (25 °C) [1] 32.59 g/100 mL (100 °C) [2] | |
Solubility | Soluble in
acetic acid Insoluble in alcohol |
Solubility in dimethylformamide | 0.5 g/kg [1] |
−53.0·10−6 cm3/mol | |
Structure | |
Orthorhombic | |
Thermochemistry | |
Heat capacity (C)
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125.5 J/mol·K [1] |
Std molar
entropy (S⦵298) |
135 J/mol·K [1] |
Std enthalpy of
formation (ΔfH⦵298) |
−490.4 kJ/mol [1] |
Gibbs free energy (ΔfG⦵)
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35.1 kJ/mol [1] |
Hazards | |
GHS labelling: | |
[4] | |
Danger | |
H272, H302, H317, H334 [4] | |
P220, P261, P280, P342+P311 [4] | |
NFPA 704 (fire diamond) | |
Lethal dose or concentration (LD, LC): | |
LD50 (
median dose)
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108 mg/kg (mice, intravenous) [1] |
Related compounds | |
Other
anions
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Sodium iodide Sodium periodate Sodium bromate Sodium chlorate |
Other
cations
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Potassium iodate Silver iodate |
Except where otherwise noted, data are given for materials in their
standard state (at 25 °C [77 °F], 100 kPa).
|
Sodium iodate ( Na I O3) is the sodium salt of iodic acid. Sodium iodate is an oxidizing agent. It has several uses.
It can be prepared by reacting a sodium-containing base such as sodium hydroxide with iodic acid, for example:
It can also be prepared by adding iodine to a hot, concentrated solution of sodium hydroxide or sodium carbonate:
Sodium iodate can be oxidized to sodium periodate in water solutions by hypochlorites or other strong oxidizing agents:
The main use of sodium iodate in everyday life is in iodised salt. The other compounds which are used in iodised table salt are potassium iodate, potassium iodide, and sodium iodide. Sodium iodate comprises 15 to 50 mg per kilogram of applicable salt.
Sodium iodate is also used as a dough conditioner to strengthen the dough.
Iodates combined with organic compounds form an explosive mixture.[ citation needed]