Potassium iodide

 

Potassium iodide

Chemical formula	KI
Molar Mass(g/mol)	168.0028
Density(g/cc)	3.123
Melting Point(°C)	681
Boiling Point(°C)	1330
Solubility in water(g/L)	1400
Solubility in ethanol(g/L)	20
NFPA 704	0 1 0

Uses

Primary

• Pharm: WHO LEM dietary supplement
• Thyroid protection

Natural occurrence

• Potassium iodide occurs in kelp

Production

Synthesis

1. Combine iodine with potassium hydroxide in water and heat.

   3 I₂ + 6 KOH(aq)

   {

   →

   heat}

   5 KI + KIO₃ + 3 H₂O

2. Chill the solution to precipitate the iodate
3. Filter
4. Residue is potassium iodate
5. evaporate filtrate to dryness, leaving potassium iodide.