Potassium iodide

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Potassium iodide
Chemical formula {{#Chem: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

Hazards

Production

Extraction

Synthesis

  1. Combine iodine with potassium hydroxide in water and heat.
    {{#Chem: 3I2 + 6KOH(aq) {= heat} 5KI + KIO3 + 3H2O}}
  2. Chill the solution to precipitate the iodate
  3. Filter
  4. Residue is potassium iodate
  5. evaporate filtrate to dryness, leaving potassium iodide.

See Also

References