Barium Selenate
   HOME

TheInfoList



OR:

Barium selenate is an
inorganic compound An inorganic compound is typically a chemical compound that lacks carbon–hydrogen bonds⁠that is, a compound that is not an organic compound. The study of inorganic compounds is a subfield of chemistry known as ''inorganic chemistry''. Inorgan ...
with the
chemical formula A chemical formula is a way of presenting information about the chemical proportions of atoms that constitute a particular chemical compound or molecule, using chemical element symbols, numbers, and sometimes also other symbols, such as pare ...
BaSeO4. It is isomorphous with
barium sulfate Barium sulfate (or sulphate) is the inorganic compound with the chemical formula Ba SO4. It is a white crystalline solid that is odorless and insoluble in water. It occurs in nature as the mineral barite, which is the main commercial source of ...
, but its solubility is 18 times that of barium sulfate, and its thermal stability is worse than that of barium sulfate.


Preparation

Barium selenate can be obtained from the reaction of any soluble barium salt and sodium selenate: : BaCl2 + Na2SeO4 → BaSeO4↓ + 2 NaCl


Properties

Barium selenate is a white solid that is slightly soluble in water. When heated above 425 °C, the compound decomposes. Another barium selenate, barium diselenate, BaSe2O7, is also known. It has an
orthorhombic In crystallography, the orthorhombic crystal system is one of the 7 crystal systems. Orthorhombic Lattice (group), lattices result from stretching a cubic crystal system, cubic lattice along two of its orthogonal pairs by two different factors, res ...
baryte Baryte, barite or barytes ( or ) is a mineral consisting of barium sulfate (Ba S O4). Baryte is generally white or colorless, and is the main source of the element barium. The ''baryte group'' consists of baryte, celestine (strontium sulfate), ...
-type crystal structure with the
space group In mathematics, physics and chemistry, a space group is the symmetry group of a repeating pattern in space, usually in three dimensions. The elements of a space group (its symmetry operations) are the rigid transformations of the pattern that ...
''Pnma'' (space group no. 62) (a = 8.993 Å, b = 5.675 Å, c = 7.349 Å).


Uses

Barium selenate has been used as a "slow release" source of
selenium Selenium is a chemical element; it has symbol (chemistry), symbol Se and atomic number 34. It has various physical appearances, including a brick-red powder, a vitreous black solid, and a grey metallic-looking form. It seldom occurs in this elem ...
for grazing animal feed crops and was intended to ensure selenium supply to grazing animals. In Switzerland and the EU, direct use as a feed additive is prohibited. Barium selenide can be obtained by reducing barium selenate in a hydrogen stream: : BaSeO4 + 4 H2 → BaSe + 4 H2O


References

{{Selenates category:Barium compounds category:Selenates