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Boron trioxide is produced by treating borax with sulfuric acid in a fusion furnace. At temperatures above 750 °C, the molten boron oxide layer separates out from sodium sulfate. It is then decanted, cooled and obtained in 96–97% purity. [3] Another method is heating boric acid above ~300 °C.
Boric acid, more specifically orthoboric acid, is a compound of boron, oxygen, and hydrogen with formula B(OH) 3. It may also be called hydrogen orthoborate, trihydroxidoboron or boracic acid. [3] It is usually encountered as colorless crystals or a white powder, that dissolves in water, and occurs in nature as the mineral sassolite.
Guitar slide made of borosilicate glass. Borosilicate glass is a type of glass with silica and boron trioxide as the main glass-forming constituents. Borosilicate glasses are known for having very low coefficients of thermal expansion (≈3 × 10 −6 K −1 at 20 °C), making them more resistant to thermal shock than any other common glass.
Boron-boron multiple bonds are rare, although doubly-bonded dianions have been known since the 1990s. [20] Neutral analogues use NHC adducts, such as the following diborane(2) derivative: [21] [22] Each boron atom has an attached proton and is coordinated to a NHC carbene. [23] [24] A reported diboryne is based on similar chemistry. [25]
In this structure, there are two four-coordinate boron centers and two three-coordinate boron centers. It is a proton conductor at temperatures above 21 °C. Conductivity is maximum along the b-axis. [16] Borax is also easily converted to boric acid and other borates, which have many applications. Its reaction with hydrochloric acid to form ...
A large number of anionic boron hydrides are known, e.g. [B 12 H 12] 2−. The formal oxidation number in boranes is positive, and is based on the assumption that hydrogen is counted as −1 as in active metal hydrides. The mean oxidation number for the boron atoms is then simply the ratio of hydrogen to boron in the molecule.
As a pyrophoric substance, diborane reacts exothermically with oxygen to form boron trioxide and water: 2 B 2 H 6 + 6 O 2 → 2 B 2 O 3 + 6 H 2 O (ΔH r = −2035 kJ/mol = −73.47 kJ/g) Diborane reacts violently with water to form hydrogen and boric acid: B 2 H 6 + 6 H 2 O → 2 B(OH) 3 + 6 H 2 (ΔH r = −466 kJ/mol = −16.82 kJ/g) Diborane ...
Trioxidane (systematically named dihydrogen trioxide, [2] [3]), also called hydrogen trioxide [4] [5] is an inorganic compound with the chemical formula H[O] 3 H (can be written as [H(μ-O 3)H] or [H 2 O 3]). It is one of the unstable hydrogen polyoxides. [4] In aqueous solutions, trioxidane decomposes to form water and singlet oxygen: