Sodium stannate, formally sodium hexahydroxostannate(IV), is the

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 formula Na₂ n(OH)₆ This colourless salt forms upon dissolving metallic

tin Tin is a chemical element; it has symbol Sn () and atomic number 50. A silvery-colored metal, tin is soft enough to be cut with little force, and a bar of tin can be bent by hand with little effort. When bent, a bar of tin makes a sound, the ...

tin(IV) oxide Tin(IV) oxide, also known as stannic oxide, is the inorganic compound with the formula SnO2. The mineral form of SnO2 is called cassiterite, and this is the main ore of tin. With many other names, this oxide of tin is an important material in ti ...

sodium hydroxide Sodium hydroxide, also known as lye and caustic soda, is an inorganic compound with the formula . It is a white solid ionic compound consisting of sodium cations and hydroxide anions . Sodium hydroxide is a highly corrosive base (chemistry), ...

and is used as a stabiliser for

hydrogen peroxide Hydrogen peroxide is a chemical compound with the formula . In its pure form, it is a very pale blue liquid that is slightly more viscosity, viscous than Properties of water, water. It is used as an oxidizer, bleaching agent, and antiseptic, usua ...

. In older literature, stannates are sometimes represented as having the simple oxyanion SnO₃²⁻, in which case this compound is sometimes named as sodium stannate–3–water and represented as Na₂SnO₃·3H₂O, a

hydrate In chemistry, a hydrate is a substance that contains water or its constituent elements. The chemical state of the water varies widely between different classes of hydrates, some of which were so labeled before their chemical structure was understo ...

with three waters of crystallisation. The anhydrous form of sodium stannate, Na₂SnO₃, is recognised as a distinct compound with its own CAS Registry Number, and a distinct

material safety data sheet A safety data sheet (SDS), material safety data sheet (MSDS), or product safety data sheet (PSDS) is a document that lists information relating to occupational safety and health for the use of various substances and products. SDSs are a wide ...

. Alkali metal stannate compounds are prepared by dissolving elemental tin in a suitable

metal hydroxide In chemistry, metal hydroxides are a family of compounds of the form where M is a metal. They consist of hydroxide () anions and metallic cations, and are often strong bases. Some metal hydroxides, such as alkali metal hydroxides, ionize comple ...

, in the case of sodium stannate by the reaction: :Sn + 2 NaOH + 4 H₂O → Na₂ n(OH)₆ + 2 H₂ A similar reaction occurs when

tin dioxide Tin(IV) oxide, also known as stannic oxide, is the inorganic compound with the formula SnO2. The mineral form of SnO2 is called cassiterite, and this is the main ore of tin. With many other names, this oxide of tin is an important material in ti ...

is dissolved in base: :SnO₂ + 2 NaOH + 2 H₂O → Na₂ n(OH)₆The anhydrous form can also be prepared from tin dioxide by roasting with

sodium carbonate Sodium carbonate (also known as washing soda, soda ash, sal soda, and soda crystals) is the inorganic compound with the formula and its various hydrates. All forms are white, odourless, water-soluble salts that yield alkaline solutions in water ...

in a mixed

carbon monoxide Carbon monoxide (chemical formula CO) is a poisonous, flammable gas that is colorless, odorless, tasteless, and slightly less dense than air. Carbon monoxide consists of one carbon atom and one oxygen atom connected by a triple bond. It is the si ...

carbon dioxide Carbon dioxide is a chemical compound with the chemical formula . It is made up of molecules that each have one carbon atom covalent bond, covalently double bonded to two oxygen atoms. It is found in a gas state at room temperature and at norma ...

environment: :SnO₂ + Na₂CO₃ → Na₂SnO₃ + CO₂ The

anion An ion () is an atom or molecule with a net electrical charge. The charge of an electron is considered to be negative by convention and this charge is equal and opposite to the charge of a proton, which is considered to be positive by conven ...

is a

coordination complex A coordination complex is a chemical compound consisting of a central atom or ion, which is usually metallic and is called the ''coordination centre'', and a surrounding array of chemical bond, bound molecules or ions, that are in turn known as ' ...

that is

octahedral In geometry, an octahedron (: octahedra or octahedrons) is any polyhedron with eight faces. One special case is the regular octahedron, a Platonic solid composed of eight equilateral triangles, four of which meet at each vertex. Many types of i ...

in shape, similar to most stannates, such as the hexachlorostannate anion . The Sn—O bond distances average 2.071 Å.

References

{{Reflist Stannates Sodium compounds Hydroxides

See also

References