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Selenium dioxide

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Identification
Molecular formula
SeO2
CAS number
7446-08-4
IUPAC name
selenium dioxide
State
State

At room temperature, selenium dioxide is a solid. It sublimates at higher temperatures and forms toxic vapors, so handling requires appropriate safety precautions. This sublimation property is used for purifying selenium.

Melting point (Celsius)
340.00
Melting point (Kelvin)
613.00
Boiling point (Celsius)
315.00
Boiling point (Kelvin)
588.00
General information
Molecular weight
110.96g/mol
Molar mass
110.9610g/mol
Density
3.9540g/cm3
Appearence

Selenium dioxide typically appears as a white, crystalline solid. It can also appear in an amorphous form. It is known for its sharp, pungent odor similar to horseradish. When it dissolves in water, it forms selenious acid, giving it a slightly acidic characteristic.

Comment on solubility

Solubility of Selenium Dioxide

Selenium dioxide (SeO2) is a compound known for its unique properties and behavior in solutions. Solubility is an essential aspect to consider, especially in various chemical and industrial applications.

General Solubility

Selenium dioxide is characterized by:

  • Moderate Solubility in Water: It has limited solubility in water, approximately 0.7 g/100 mL at room temperature.
  • Behavior in Organic Solvents: It is soluble in many organic solvents, which allows it to partake in various organic reactions.
  • Acidic Nature: The compound can hydrolyze in water to form selenous acid (H2SeO3), especially under acidic conditions.

Factors Affecting Solubility

Several factors can influence the solubility of selenium dioxide, including:

  1. Temperature: Generally, an increase in temperature enhances the solubility of solids in liquids.
  2. pH of the Solution: The solubility of SeO2 may increase in acidic solutions due to its ability to form selenous acid.
  3. Presence of Other Ions: The presence of different ions in the solution can either promote or hinder solubility through interactions.

In summary, the solubility of selenium dioxide is multifaceted, with its behavior influenced by environmental conditions. Understanding these properties is crucial for optimizing its use in various applications.

Interesting facts

Interesting Facts About Selenium Dioxide

Selenium dioxide, a fascinating compound with a diverse array of applications, plays a significant role in both organic and inorganic chemistry. Here are some intriguing aspects of this compound:

  • Chemical Structure: Selenium dioxide is typically represented as SeO2. Its molecular structure exhibits a trigonal bipyramidal arrangement, showcasing the unique geometry associated with selenium in higher oxidation states.
  • Oxidizing Agent: It acts as a potent oxidizing agent. In this capacity, it facilitates various chemical reactions, making it invaluable in laboratories and industrial processes. For example, it can oxidize alcohols to aldehydes and acids.
  • Applications: Selenium dioxide is widely employed in the synthesis of organic selenides, as well as in the production of other selenium compounds. It's also used in the field of metallurgy, particularly for extracting selenium from ores.
  • Environmental Considerations: As an environmental scientist might note, selenium compounds, including selenium dioxide, can have ecological implications. Selenium is essential in trace amounts for many organisms, but excessive exposure can lead to toxicity and negatively affect plant and wildlife.
  • Historical Context: Selenium, discovered in 1817 by Jöns Jacob Berzelius, was named after the Greek word for "moon," highlighting its connection with the element's shimmering appearance. Its dioxide form was later characterized for its distinctive properties.

As scientists continue to explore the reactivity and nuances of selenium dioxide, its value across various domains of research and industry remains prominent, providing opportunities for innovation and discovery.

Synonyms
SELENIUM DIOXIDE
7446-08-4
Selenious anhydride
Selenium dioxide dimer
Selenous acid anhydride
Selenium(IV) dioxide (1:2)
Selenium oxide (Se2O4)
RCRA waste number U204
Selenium oxide (1:2)
CCRIS 5820
HSDB 677
9N3UK29E57
EINECS 231-194-7
NSC 56753
NSC-56753
SELENIUM DIOXIDE [HSDB]
DTXSID4021264
EC 231-194-7
Selenous anhydride
(oxo-lambda4-selanylidene)oxidane
231-194-7
jpjalaqpgmakdf-uhfffaoysa-n
Selenium(IV) oxide
Selenium oxide
Oxoselane oxide
Selenium oxide (SeO2)
MFCD00003562
SELENIUM (IV) OXIDE
12640-89-0
Seleniumdioxide
Selenium(IV) dioxide
Selenonyl
seleninyl oxygen
dioxido de selenio
Oxoselane oxide #
biossido di selenio
dioxyde de selenium
EINECS 235-738-4
SeO2
Selenium oxide, SeO2
selenium (IV) dioxide
SELENIUM OXIDE [MI]
WLN: SE O2
UNII-9N3UK29E57
DTXCID901264
CHEMBL3183452
SELENIUM OXIDE [WHO-DD]
Selenium dioxide, puriss., 98%
NSC56753
Tox21_202597
NA2811
STL264213
AKOS015855284
FS34840
Selenium oxide [NA2811] [Poison]
Selenium(IV) oxide (99.999%-Se)
NCGC00260145-01
BP-21360
CAS-7446-08-4
DB-004088
E1459
NS00113742
Selenium dioxide, reagent grade, powder, 98%
Selenium dioxide, >=99.9% trace metals basis
Selenium dioxide, 99.999% trace metals basis
A838139
Q411386
Selenium dioxide, ReagentPlus(R), powder, 99.8% trace metals basis