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Potassium iodate

Potassium iodate
Potassium-iodate-unit-cell-3D-balls.png
Jodičnan draselný.JPG
Names
IUPAC name
Potassium iodate
Other names
Iodic acid, potassium salt
Identifiers
7758-05-6 YesY
3D model (Jmol) Interactive image
ChemSpider 22856 YesY
ECHA InfoCard 100.028.938
EC Number 231-831-9
E number E917 (glazing agents, ...)
PubChem 23665710
RTECS number NN1350000
UNII I139E44NHL YesY
Properties
KIO3
Molar mass 214.001 g/mol
Appearance white crystalline powder
Odor odorless
Density 3.89 g/cm3
Melting point 560 °C (1,040 °F; 833 K) (decomposes)
4.74 g/100 mL (0 °C)
9.16 g/100 mL (25 °C)
32.3 g/100 mL (100 °C)
Solubility soluble in KI solution
insoluble in alcohol, liquid ammonia, nitric acid
−63.1·10−6 cm3/mol
Hazards
R-phrases R9, R22, R36, R37, R38
S-phrases S35
NFPA 704
Flammability code 0: Will not burn. E.g., water Health code 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g., chloroform Reactivity code 2: Undergoes violent chemical change at elevated temperatures and pressures, reacts violently with water, or may form explosive mixtures with water. E.g., phosphorus Special hazard OX: Oxidizer. E.g., potassium perchlorateNFPA 704 four-colored diamond
Flash point Non-flammable
Related compounds
Other anions
Potassium chlorate
Potassium bromate
Other cations
Sodium iodate
Related compounds
 Potassium iodide
Potassium periodate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N  (what is YesYN ?)
Infobox references

Potassium iodate (KIO3) is a chemical compound. It is ionic, made up of K+ ions and IO3− ions in a 1:1 ratio.

Potassium iodate is an oxidizing agent and as such it can cause fires if in contact with combustible materials or reducing agents. It can be prepared by reacting a potassium-containing base such as potassium hydroxide with iodic acid, for example:

It can also be prepared by adding iodine to a hot, concentrated solution of potassium hydroxide.

Or by fusing potassium iodide with potassium chlorate, bromate or perchlorate, the melt is extracted with water and potassium iodate is isolated from the solution by crystallization:

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

Potassium iodate is sometimes used for iodination of table salt to prevent iodine deficiency. Because iodide can be oxidized to iodine by molecular oxygen under wet conditions, US companies add thiosulfates or other antioxidants to the potassium iodide. In other countries, potassium iodate is used as a source for dietary iodine. It is also an ingredient in some baby formula milk.


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