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Sodium Bromate

Sodium bromate, also called sodium salt of bromic acid, is an inorganic compound of sodium, bromine, and oxygen represented by the chemical formula NaBrO3 [1]. It is a strong oxidizing agent that may explode through prolonged exposure to fire or heat [1].

Sodium Bromate Identification

CAS Number 7789-38-0 [1]
PubChem CID 23668195 [1]
ChemSpider ID 23009 [2]
UN Number 1494 [1]
EC Number 232-160-4 [1]
RTECS Number EF8750000 [1]
UNII U54JK64530 [1]
ICSC Number 0196 [1]
InChI Key XUXNAKZDHHEHPC-UHFFFAOYSA-M [1]

Formula of Sodium Bromate

Sodium Bromate Composition and Synthesis

When bromine reacts with a concentrated, heated solution of sodium carbonate, it produces sodium bromate, sodium bromide, and carbon dioxide as the products [3].

3Br2 + 3Na2CO3 → 5NaBr + NaBrO3 + 3CO2

Sodium bromate is formed through electrolytic oxidation of sodium bromide in which stainless steel plate works as the cathode and mixed metal oxide coated titanium plate acts as the anode [1].

NaBr + 3H2O → NaBrO3 + 3H2

Sodium Bromate

Properties and Characteristics of Sodium Bromate

General Properties

Molar Mass/Molecular Weight 150.891 g/mol [1]

Physical Properties

Color and Appearance Colorless to white crystals, dry powder [1]
Odor Odorless [1]
Melting Point 381 °C, 717.8 °F (decomposes with evolution of oxygen) [1]
Boiling Point  1390 °C, 2530 °F [1]
Density 3.34 g cm-3 [1]
pH 5.0-9.0 at 25 °C [4]
State of matter at room temperature Solid [1]
Solubility Soluble in ammonia and insoluble in ethanol [1]
Solubility in Water 27.5 g/100 g at 0 °C

36.4 g/100 g at 20 °C

48.8 g/100 g at 40 °C

62.6 g/100 g at 60 °C

75.8 g/100 g at 80 °C

90.8 g/100 g at 100 °C [1]

Magnetic Susceptibility (χ)  -44.2 X 10-6 cm3/mol

Atomic Properties

Crystal Structure Cubic

Sodium Bromate Structure

Uses

  • As a permagent in hair treatment formulations [1].
  • Boiler cleaning and dyeing applications that involve oxidation of sulfur dyes [1].
  • Combined with sodium bromide as a gold solvent in mines [1].

Is It Safe

Sodium bromate is known to cause acute toxicity by ingestion, inhalation, and through contact with skin and eyes [1]. It causes serious skin irritation, eye damage, and may result in respiratory tract irritation [1]. Being a carcinogen, it may cause chromosomal abnormalities and genetic defects [1].

References

  1. Sodium Bromate – Pubchem.ncbi.nlm.nih.gov
  2. Sodium Bromate – Chemspider.com
  3. Bromine React With Sodium Carbonate – Chemiday.com
  4. Sodium Bromate – Sigmaaldrich.com

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