Potassium Bromide - KBr

What is Potassium Bromide?

KBr is a salt which is widely used as a sedative and as an anticonvulsant with chemical name Potassium Bromide.

Potassium Bromide.is also called Bromide salt of potassium or Kalii bromidum or Tripotassium tribromide.

Bromide salt of potassium is odourless, and is obtained as white crystalline powder or colorless crystals or white granular solid which has a pungent bitter saline taste. Aqueous solutions have a pH value of 7.

Properties of Potassium Bromide – KBr

KBr Potassium Bromide
Molecular weight of KBr 119.002 g/mol
Density of Potassium Bromide 2.74 g/cm3
Melting point of Potassium Bromide 734 °C
Boiling point of Potassium Bromide 1,435 °C

Potassium Bromide Structure – KBr

Potassium Bromide structure

Potassium Bromide Structure – KBr

KBr Uses (Potassium Bromide)

  • Potassium Bromide is used to manufacture photographic papers and plates.
  • Used as a laboratory agent.
  • Used as heat stabilizer for nylon.
  • Used as a Sedative.
  • Used as an anticonvulsant.
  • Used in the water treatment of aquariums
  • Used to manufacture chemicals.
  • Used as plasticizers.

Production of Potassium Bromide

One of the traditional methods of producing KBr is by reacting potassium carbonate with an iron (III, II) bromide. The reaction is as follows.

4 K2CO3 + Fe3Br8 → 8 KBr + Fe3O4 + 4 CO2

Potassium Bromide Reactions

It is a typical ionic salt which is fully dissociated at near pH value of 7 in the aqueous solution. This reaction plays an important role in the manufacture of silver bromide for photographic films. The reaction is as follows:

KBr(aq) + AgNO3(aq) → AgBr(s) + KNO3(aq)

Bromide in its aqueous form, produces complexes on reacting with metal halides like copper (II) bromide:

2 KBr(aq) + CuBr2(aq) → K2[CuBr4](aq)

Health Hazards

Some of the symptoms include vomiting, ataxia, coma, irritability, and mental confusion. It can cause mania, skin rashes, drowsiness, and hallucinations. It also causes neurological signs, increased spinal fluid pressures, death, vertigo, and sensory disturbances.

Frequently Asked Questions

What is potassium bromide used for?

Potassium bromide is one of the standard anticonvulsant drugs used to treat canine and feline epilepsy, and is often abbreviated as KBr. This is often used in combination with Phenobarbital but can also be used by itself to regulate seizure activity.

How does potassium bromide work?

Potassium bromide acts as chloride ions fight for entry to brain tissues. If the bromide levels in the brain increase and the chloride levels fall, electrical activity in the central nervous system is disrupted, making it difficult to cause a seizure.

How is potassium bromide used?

The potassium bromide, or KBr, has been used as an anti-seizure drug in human and veterinary medicine for over a century. Phenobarbital, or PB, has been used to treat seizures for years too. Given the long history of widespread use of both medications, neither is FDA approved for treating seizures in humans or animals.

What Colour is potassium bromide solution?

Potassium bromide is a pure, crystalline powder under normal conditions. It is free to soluble in water; acetonitrile is not soluble. Potassium bromide tastes sweet in a dilute aqueous solution, it tastes sour at low concentrations, and tastes salty when the concentration is much low.

What occurs when potassium bromide KBr is dissolved in water?

If KBr, potassium bromide, is dissolved in water it dissociates into ions of potassium, K+ and bromine, Br-ions. The water molecules surround these ions to create a surface layer.

Learn more about the Structure, physical and chemical properties of KBr from the experts at BYJU’S.

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