Potassium Iodate - KIO3

What is Potassium Iodate?

Potassium iodate is an oxidising agent and as such it can cause fires if in contact with combustible materials or reducing agents. The chemical formula for potassium iodate is KIO3. It can be prepared by reacting potassium base with iodic acid. Potassium iodate is the major chemical compound used for iodization of edible common salts. It provides a convenient way of performing iodimetric work. Potassium iodate is also sometimes used to precipitate thorium especially to remove it from the rare earths.

Properties of Potassium Iodate

KIO3 Potassium Iodate
Density of Potassium iodate 3.89 g/cm³
Molecular Weight/ Molar Mass of Potassium iodate 214.001 g/mol
Specific gravity of Potassium iodate 4.93 g/cm3
Melting Point of Potassium iodate 560 °C
Chemical Formula of Potassium iodate KIO3

Potassium Iodate Structure – KIO3

Potassium Iodate Structure

Structure of Potassium Iodate

Physical Properties of Potassium Iodate – KIO3

Odour Odorless
Appearance White crystalline powder
Covalently-Bonded Unit 2
Heat capacity 313 J Kg-1 K-1
Hydrogen Bond Acceptor 3
Solubility Soluble in KI solution insoluble in alcohol

Chemical Properties of Potassium Iodate – KIO3

    • Potassium iodate combines with potassium iodide in the presence of strong acid like sulfuric acid forms potassium sulfate, iodine and water.

KIO3 + 5KI + 3H2SO4 → 3K2SO4 + 3H2O + 3I2

    • Potassium iodate reacts with silver nitrate forms silver iodate and potassium nitrate. The chemical reaction is given below.

KIO3 + AgNO3 → AgIO3 + KNO3

Uses of Potassium Iodate – KIO3

  • Used in the iodination of table salt because iodide can be oxidised by molecular oxygen to iodine under wet conditions.
  • Used in the analysis of testing arsenic and zinc.
  • Used in the iodometry in medicine manufacturing.
  • Used in food as a maturing agent and dough conditioner.
  • Used as a reagent and as feed additives.

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