# Sodium Iodide - NaI

## What is Sodium Iodide?

Sodium iodide is an ionic compound produced by the addition of sodium hydroxide or sodium carbonate to hydriodic acid. The chemical formula for sodium iodide is NaI. It is a colourless cubic crystals that are soluble in polar solvents. It is one of the oldest members of the optical engineering family and is considered by many scientists as a standard optical device in the field of detection technology.

Other names – Sodium monoiodide

 NaI Sodium Iodide Density 3.67 g/cm³ Molecular Weight/ Molar Mass 149.89 g/mol Charge of Na +1 Boiling Point 1,304 °C Melting Point 661 °C Chemical Formula NaI

## Physical Properties of Sodium Iodide – NaI

 Odour Odorless Appearance White solid, deliquescent Covalently-Bonded Unit 2 Heat capacity 347J/(kg·K) Complexity 2 Solubility Soluble in water, acetone and ethanol.

## Chemical Properties of Sodium Iodide – NaI

• Sodium iodide reacts with sulphuric acid results in the formation of hydrogen iodide and sodium bisulfite. The chemical equation is given below.
• NaI + H2SO4 → HI + NaHSO4

• Sodium iodide reacts with chlorine, where chlorine replaces iodine forming sodium chloride and iodine.The chemical equation is given below.
• Cl2 + 2NaI → 2 NaCl + I2

## Uses of Sodium Iodide – NaI

• Sodium iodide is used in medicine as a supplement for iodine to treat thyroid disorders.
• Used in the treatment of actinobacillosis and actinomycosis in cattle.
• A Small amount of Sodium iodide is added to the Sodium chloride to make “iodised salt’. This makes sure you get the iodide you need in your diet.