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Potassium iodate

Potassium iodate
An unopened box of Potassium iodate tablets, produced and distributed to the population of the Republic of Ireland following a preparedness scandal relating to the Sellafield nuclear power station in the United Kingdom.
General
Other names	iodic acid, potassium salt
Molecular formula	KIO₃
Molar mass	214.00 g/mol
Appearance	white crystalline powder
CAS number	[7758-05-6]
Properties
Density and phase	3.89 g/cm³, solid
Solubility in water	32g/100ml (100°C)
Melting point	560°C partial decomposition
Boiling point	?
Hazards
EU classification	not listed
NFPA 704	0 1 1
Related compounds
Other anions	potassium iodide potassium periodate potassium bromate potassium chlorate
Other cations	sodium iodate silver iodate
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references

Potassium iodate (K IO₃) is a chemical compound. It is sometimes used in radiation treatment, as it can replace radioactive iodine from the thyroid. See potassium iodide for more information on this use.

Additional recommended knowledge

Correct Test Weight Handling Guide: 12 Practical Tips

Essential Laboratory Skills Guide

Safe Weighing Range Ensures Accurate Results

Like potassium bromate, potassium iodate is occasionally used as a maturing agent in baking.

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:

HIO₃ + KOH → KIO₃ + H₂O

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

3 I₂ + 6 KOH → KIO₃ + 5 KI + 3 H₂O

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

Use

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