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Barium carbonate is the
inorganic compound In chemistry Chemistry is the study of the properties and behavior of . It is a that covers the that make up matter to the composed of s, s and s: their composition, structure, properties, behavior and the changes they undergo during a ...
with the formula BaCO3. Like most alkali metal carbonates, it is a white salt that is poorly soluble in water. It occurs as the mineral known as
witherite Witherite is a barium carbonate mineral, barium, Bacarbon, Coxygen, O3, in the aragonite group. Witherite crystallizes in the orthorhombic system and virtually always is Crystal twinning, twinned. The mineral is colorless, milky-white, grey, pale-y ...
. In a commercial sense, it is one of the most important
barium Barium is a chemical element with the Symbol (chemistry), symbol Ba and atomic number 56. It is the fifth element in group 2 and is a soft, silvery alkaline earth metal. Because of its high chemical Reactivity (chemistry), reactivity, ba ...

barium
compounds.


Preparation

Barium carbonate is made commercially from barium sulfide with by treatment with
sodium carbonate Sodium carbonate, ·10, (also known as Natrium Carbonate, washing soda, soda ash and soda crystals) is the inorganic compound with the formula Na2CO3 and its various hydrates. All forms are white, odourless, water-soluble salts that yield modera ...

sodium carbonate
at 60 to 70 °C (
soda ash Sodium carbonate, , (also known as washing soda, soda ash and soda crystals) is the inorganic compound with the formula Na2CO3 and its various hydrates. All forms are white, water-soluble salts that yield moderately alkaline solutions in water. H ...
method) or, more commonly
carbon dioxide Carbon dioxide (chemical formula A chemical formula is a way of presenting information about the chemical proportions of s that constitute a particular or molecule, using symbols, numbers, and sometimes also other symbols, such as pare ...

carbon dioxide
at 40 to 90 °C: In the soda ash process, an aqueous solution of barium sulfide is treated with sodium carbonate: :BaS + H2O + CO2 → BaCO3 + H2S


Reactions

Barium carbonate reacts with acids such as
hydrochloric acid Hydrochloric acid +(aq) Cl−(aq) or H3O+ Cl− also known as muriatic acid, is an aqueous solution An aqueous solution is a solution Solution may refer to: * Solution (chemistry) Image:SaltInWaterSolutionLiquid.jpg, upMaking a salin ...

hydrochloric acid
to form soluble barium salts, such as
barium chloride Barium chloride is an inorganic compound In chemistry Chemistry is the study of the properties and behavior of . It is a that covers the that make up matter to the composed of s, s and s: their composition, structure, properties, beha ...

barium chloride
: : + 2 HCl → + + Pyrolysis of barium carbonate gives barium oxide.


Uses

It is mainly used to remove sulfate impurities from feedstock of the chlor-alkali process. Otherwise it is a common precursor to barium-containing compounds such as ferrites.


Other uses

Barium carbonate is widely used in the ceramics industry as an ingredient in glazes. It acts as a flux, a matting and crystallizing agent and combines with certain colouring oxides to produce unique colours not easily attainable by other means. Its use is somewhat controversial since some claim that it can leach from glazes into food and drink. To provide a safe means of use, BaO is often used in
frit A frit is a ceramic A ceramic is any of the various hard, brittle, heat-resistant and corrosion-resistant Corrosion is a natural process that converts a refined metal into a more chemically stable form such as oxide of rutile. Ti(IV) cent ...
ted form. In the brick, tile, earthenware and pottery industries barium carbonate is added to clays to precipitate soluble salts (
calcium sulfate Calcium sulfate (or calcium sulphate) is the inorganic compound with the formula CaSO4 and related hydrate In chemistry Chemistry is the science, scientific study of the properties and behavior of matter. It is a natural science that cove ...

calcium sulfate
and
magnesium sulfate Magnesium sulfate or magnesium sulphate (in British English British English (BrE) is the standard dialect A standard language (also standard variety, standard dialect, and standard) is a language variety that has undergone substantial ...

magnesium sulfate
) that cause
efflorescence 300px, Secondary efflorescence on the dam of the Robert Moses Niagara Power Plant. In chemistry, efflorescence (which means "to flower out" in French) is the migration of a Salt (chemistry), salt to the surface of a porous material, where it for ...
.


References


External links

{{Authority control Barium compounds Carbonates Pyrotechnic colorants