Sodium iodate

Sodium iodate (NaIO3) is the sodium salt of iodic acid. Sodium iodate is an oxidizing agent, and as such it can cause fires upon contact with combustible materials or reducing agents.

Sodium iodate
Names
Other names
Iodic acid, sodium salt
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.028.793
EC Number
  • 231-672-5
RTECS number
  • NN1400000
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[1]
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)[2]
32.59 g/100 mL (100 °C)[3]
Solubility Soluble in acetic acid
Insoluble in alcohol
Solubility in dimethylformamide 0.5 g/kg[2]
53.0·10−6 cm3/mol
Structure
Orthorhombic
Thermochemistry
125.5 J/mol·K[2]
135 J/mol·K[2]
−490.4 kJ/mol[2]
35.1 kJ/mol[2]
Hazards
GHS pictograms [4]
GHS Signal word Danger
H272, H302, H317, H334[4]
P220, P261, P280, P342+311[4]
NFPA 704 (fire diamond)
Lethal dose or concentration (LD, LC):
108 mg/kg (mice, intravenous)[2]
Related compounds
Other anions
Sodium iodide
Sodium periodate
Sodium bromate
Sodium chlorate
Other cations
Potassium iodate
Silver iodate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YN ?)
Infobox references

Preparation

It can be prepared by reacting a sodium-containing base such as sodium hydroxide with iodic acid, for example:

HIO3 + NaOH → NaIO3 + H2O

It can also be prepared by adding iodine to a hot, concentrated solution of sodium hydroxide or its carbonate:

3 I2 + 6 NaOH → NaIO3 + 5 NaI + 3 H2O

Reactions

Sodium iodate can be oxidized to sodium periodate in water solutions by hypochlorites or other strong oxidizing agents:

NaIO3 + NaOClNaIO4 + NaCl

Uses

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.

Safety

Conditions/substances to avoid are: heat, shock, friction, combustible materials, reducing materials, aluminium, organic compounds, carbon, hydrogen peroxide, sulfides.

References

  1. Lide, David R. (1998). Handbook of Chemistry and Physics (87 ed.). Boca Raton, Florida: CRC Press. pp. 4–85. ISBN 0-8493-0594-2.
  2. http://chemister.ru/Database/properties-en.php?dbid=1&id=759
  3. Seidell, Atherton; Linke, William F. (1919). Solubilities of Inorganic and Organic Compounds (2nd ed.). D. Van Nostrand Company.
    Results here are multiplied by water's density at temperature of solution for unit conversion.
  4. Sigma-Aldrich Co., Sodium iodate. Retrieved on 2014-05-25.
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