Potassium Bromate - KBrO<sub>3</sub>

What is Potassium Bromate?

Potassium Bromate is a widely used form of bromine with the chemical formula KBrO3. It is a powerful oxidising agent which is reduced smoothly to bromide. It is the potassium salt of bromide and is readily available in the high state of purity. In substitution reaction it acts as an effective brominating agent.

Alternate names – Potassium bromate(V) Bromic acid, potassium salt

KBrO3 Potassium Bromate
Density 3.27 g/cm³
Molecular Weight/ Molar Mass 167 g/mol
Boiling Point 370 °C
Melting point 350 °C
Chemical Formula KBrO3

Potassium Bromate Structure – KBrO3

Potassium Bromate

Physical Properties of Potassium Bromate – KBrO3

Odour Odourless
Appearance White crystalline powder
Magnetic susceptibility −52.6·10−6 cm3/mol
Conjugate acid‎ Bromic acid
Solubility Slightly soluble in alcohol insoluble in acetone, ethanol

Chemical Properties of Potassium Bromate – KBrO3

    • Potassium bromate reacts with sodium bromate in the presence of dilute acid solution forming bromine. The corresponding chemical equation is given below.

BrO3 + 5Br + 6H+ → 3Br2 + 3H2O

Uses of Potassium Bromate – KBrO3

  • Used as a source of bromine. Standard potassium bromate can be used directly to prepare a standard solution that is stable indefinitely.
  • Used as an antiseptic and astringent in toothpaste, mouthwashes and gargles as 3 to 5 percent solution.
  • Potassium bromate is used primarily as a conditioner for flour and dough; some of its non-food uses include use as an oxidizing agent for analytic chemistry and as a brominating agent.

Health Hazard

Potassium bromate is moderately toxic compound. Ingestion causes nausea, vomiting, diarrhea, respiratory stimulation, decrease in body temperature, methemoglobinemia and renal injury. In toothpaste it has been reported to have caused inflammation and bleeding of the gums.

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