Sodium selenate

Structural formula of sodium selenate

Sodium selenate is a chemical compound with the formula Na₂SeO₄. It is the sodium salt of selenate, and it is a colorless, water-soluble solid. Sodium selenate is an important compound in the field of chemistry and has various applications in industry and research.

Chemical properties

Sodium selenate is a selenate salt, which means it contains the selenate ion, SeO₄^2_. It is analogous to sodium sulfate, Na₂SO₄, with selenium replacing sulfur. Sodium selenate is highly soluble in water and forms a neutral solution. It is a strong oxidizing agent and can react with reducing agents to form elemental selenium or other selenium compounds.

Production

Sodium selenate can be produced by the oxidation of selenium dioxide (SeO₂) with a strong oxidizing agent such as hydrogen peroxide (H₂O₂) in the presence of sodium hydroxide (NaOH). The reaction can be represented as follows:

SeO₂ + H₂O₂ + 2 NaOH _ Na₂SeO₄ + 2 H₂O

Applications

Sodium selenate is used in various applications, including:

• Agriculture: It is used as a fertilizer additive to provide selenium, an essential micronutrient for plants and animals.
• Glass manufacturing: Sodium selenate is used as a decolorizing agent in the production of glass.
• Chemical synthesis: It serves as a precursor for the synthesis of other selenium compounds.

Safety and toxicity

Sodium selenate is toxic in large doses and should be handled with care. It can cause selenium poisoning if ingested in significant amounts. Symptoms of selenium toxicity include gastrointestinal distress, hair loss, and neurological damage. Proper safety measures should be taken when handling sodium selenate, including the use of personal protective equipment and working in a well-ventilated area.

Related pages

• Selenium
• Selenate
• Sodium sulfate
• Selenium dioxide