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Sodium Borate
Sodium borate is a generic name for any salt (chemistry), salt of sodium with an anion consisting of boron and oxygen, and possibly hydrogen, or any hydrate thereof. It can be seen as a hydrated sodium salt of the appropriate boroxy acid, although the latter may not be a stable compound. Many sodium borates have important industrial and household applications; the best known being borax, = . The ternary phase diagram of the –– phase diagram in the 0–100 °C temperature range contains 13 unique hydrated crystalline sodium borates, including five important industrial products. Sodium borates, as well as boroxy acids, are often described as mixtures = , with ''x'', ''y'', and ''z'' chosen to fit the elemental formula, or a multiple thereof. Thus, for example, borax would be , and boric acid would be = . The elemental formula was often interpreted as a ''z''-hydrate of an "anhydrous" salt without any hydrogen, namely . However, later research uncovered that many bora ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Salt (chemistry)
In chemistry, a salt or ionic compound is a chemical compound consisting of an assembly of positively charged ions ( cations) and negatively charged ions ( anions), which results in a compound with no net electric charge (electrically neutral). The constituent ions are held together by electrostatic forces termed ionic bonds. The component ions in a salt can be either inorganic, such as chloride (Cl−), or organic, such as acetate (). Each ion can be either monatomic, such as sodium (Na+) and chloride (Cl−) in sodium chloride, or polyatomic, such as ammonium () and carbonate () ions in ammonium carbonate. Salts containing basic ions hydroxide (OH−) or oxide (O2−) are classified as bases, such as sodium hydroxide and potassium oxide. Individual ions within a salt usually have multiple near neighbours, so they are not considered to be part of molecules, but instead part of a continuous three-dimensional network. Salts usually form crystalline structures ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mole (unit)
The mole (symbol mol) is a unit of measurement, the base unit in the International System of Units (SI) for ''amount of substance'', an SI base quantity proportional to the number of elementary entities of a substance. One mole is an aggregate of exactly elementary entities (approximately 602 sextillion or 602 billion times a trillion), which can be atoms, molecules, ions, ion pairs, or other particles. The number of particles in a mole is the Avogadro number (symbol ) and the numerical value of the '' Avogadro constant'' (symbol ) expressed in mol−1. The relationship between the mole, Avogadro number, and Avogadro constant can be expressed in the following equation:1\text = \frac = \frac The current SI value of the mole is based on the historical definition of the mole as the amount of substance that corresponds to the number of atoms in 12 grams of 12C, which made the molar mass of a compound in grams per mole, numerically equal to the average molecular mass or ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Peroxide
In chemistry, peroxides are a group of Chemical compound, compounds with the structure , where the R's represent a radical (a portion of a complete molecule; not necessarily a free radical) and O's are single oxygen atoms. Oxygen atoms are joined to each other and to adjacent elements through Single bond, single covalent bonds, denoted by dashes or lines. The group in a peroxide is often called the peroxide group, though some nomenclature discrepancies exist. This linkage is recognized as a common polyatomic ion, and exists in many molecules. General structure The characteristic structure of any regular peroxide is the oxygen–oxygen covalent single bond, which connects the two main atoms together. In the event that the molecule has no chemical Substituent, substituents, the peroxide group will have a [−2] Formal charge, net charge. Each oxygen atom has a charge of negative one, as 5 of its Valence electron, valence electrons remain in the outermost Atomic orbital, orbital ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sodium Perborate
Sodium perborate are chemical compounds with chemical formula (H2O)x. Commonly encountered salts are the anhydrous form (x = 0) and as a hydrate, hexahydrate (x = 6). These two species are sometimes called, respectively, "monohydrate" or PBS-1 and "tetrahydrate" or PBS-4, after the historic assumption that would be the anhydrous form). Both the anhydrous and hexahydrate salts are white, odorless, water-soluble solids. Peroxyborates are widely used in laundry detergents, as one of the peroxide-based bleaches. Sodium perborate was first obtained in 1898, independently, by Sebastian Tanatar and by P. Melikoff and L. Pissadewsky; the researchers prepared sodium perborate by treating sodium borate with a solution of hydrogen peroxide and sodium hydroxide, but Tanatar also obtained sodium perborate by electrolysis of a solution of sodium borate. Structure Unlike sodium percarbonate, the peroxyborates are not adducts of hydrogen peroxide. Rather, they contain a peroxyborate anion , ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trisodium Pentaborate
Trisodium pentaborate is a salt that can form as a monohydrate with formula , which contains the anion dihydroxydopentaborate . Its formula may be incorrectly given as , or as . It may also be called simply sodium pentaborate, but this name is more properly reserved for the compound with elemental formula . Structure Trisodium pentaborate monohydrate crystallizes as thin plates in the orthorhombic crystal system, with symmetry group In group theory, the symmetry group of a geometric object is the group of all transformations under which the object is invariant, endowed with the group operation of composition. Such a transformation is an invertible mapping of the amb ... ''Pbca'' and cell parameters ''a'' = 880.4 pm, ''b'' = 1837.1 pm, ''c'' = 1092.4 pm, formulas per cell ''Z'' = 8. References Silvio Menchetti and Cesare Sabelli (1977): "The crystal structure of synthetic sodium pentaborate monohydrate". ''Acta Crystallographica Section B'', volu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sodium Pentaborate
Sodium pentaborate, more properly disodium decaborate, is a chemical compound of sodium, boron, and oxygen; a salt with elemental formula , , or . It is a colorless crystalline solid, soluble in water. The compound is often encountered or traded as hydrates , , or for ''n'' = 2, 4, 5, or other values. This formula is often misleading as some of the water molecules are actually hydroxyl groups covalently attached to boron atoms. The compound is used in agriculture as a boron supplement in fertilizer with various trade names such as Solubor and Aquabor. It has also been tested as an additive to improve plasma electrolytic oxidation of magnesium alloys. It is also used in nuclear reactors as a neutron absorber/poison. The name "sodium pentaborate" has also been used for a distinct compound with formula , better called trisodium pentaborate. Structure and preparation Dihydrate Sodium pentaborate "dihydrate" has the elemental formula , which can be parsed as or , however the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Disodium Enneaborate
Disodium enneaborate is the traditional name for a salt of sodium, boron, oxygen, and hydrogen, with elemental formula or . It is the sodium borate with the highest boron/sodium ratio. Structure The correct formula has since been determined to be . The anion is a linear polymer with repeating unit . Sodium cations, water molecules, and undissociated boric acid molecules lie between the chains, held by numerous hydrogen bonds. The compound crystallizes in the monoclinic crystal system In crystallography, the monoclinic crystal system is one of the seven crystal systems. A crystal system is described by three vectors. In the monoclinic system, the crystal is described by vectors of unequal lengths, as in the orthorhombic sy ... with space group ''P''21/''n''. The cell parameters are ''a'' = 1021.3 pm, ''b'' = 1294.0 pm, ''c'' = 1245.7 pm, β = 93.070°, ''V'' = 1.6440 nm3, and ''Z'' = 2. The sodium cations occur in groups of four with interatomic distances of 378.30 pm ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Disodium Octaborate
Disodium octaborate is a borate of sodium, a chemical compound of sodium, boron, and oxygen — a salt with elemental formula or , also written as . It is a colorless crystalline solid, soluble in water. Disodium octaborate is traded either as a liquid concentrate, or as the tetrahydrate , a white odorless powder. It is used as an insecticide, and as a fungicide and algicide, and as a fire retardant., and as a boron micronutrient additive in fertilizers. Trade names include Bora-Care, Borathor, Termite Prufe, Board Defense, Polybor, Tim-bor, Mr Dotty 008, and Can-Bor. Preparation The anhydrous form can be crystallized from a molten mixture of sodium oxide and boric oxide . Properties Solubility The salt dissolves in water to form forms viscous supersaturated solutions at elevated temperatures. Solubility of the tetrahydrate is 21.9% (wt) at . Structure The anhydrous salt exists in two stable crystalline forms, α and β. The α form has monoclinic crystal structure, with t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sodium Tetrahydroxyborate
Sodium tetrahydroxyborate is a salt (ionic compound) with chemical formula or . It is one of several sodium borates. At room temperature it is a colorless crystalline solid. The element ratio corresponds to the oxide mixture , but the structure of the solid is quite different from that suggested by this formula. Structure Sodium tetrahydroxyborate has been crystallized from aqueous solutions in two anhydrous forms. Both contain the tetrahedral tetrahydroxyborate anion, which is formed from (ortho)boric acid in water solutions by binding an hydroxide anion instead of loss of a proton . These anions lie in layers perpendicular to the (010) plane, and form a tridimensional lattice held together by hydrogen bonds between the hydrogen atoms in each anion and the oxygen atoms in adjacent anions. Monoclinic form The first form, described in 1993, crystallizes in the monoclinic crystal system with symmetry group ''P''21/''a'' and parameters ''a'' = 588.6 pm, ''b'' = 1056.6 pm, ''c' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sodium Metaborate
Sodium metaborate is a chemical compound of sodium, boron, and oxygen with formula . However, the metaborate ion is trimeric in the anhydrous solid, therefore a more correct formula is or . The formula can be written also as to highlight the relation to the main oxides of sodium and boron. The name is also applied to several hydrates whose formulas can be written for various values of ''n''. The anhydrous and hydrates are colorless crystalline solids. The anhydrous form is hygroscopic. Hydrates and solubility The following hydrates crystallize from solutions of the proper composition in various temperature ranges: * tetrahydrate from −6 to 53.6 °C * dihydrate from 53.6 °C to 105 °C * hemihydrate from 105 °C to the boiling point. Early reports of a monohydrate have not been confirmed. Structure Anhydrous Solid anhydrous sodium metaborate has the hexagonal crystal system with space group R\bar3 c. It actually contains a six-membered rings with the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trisodium Orthoborate
Trisodium borate is a chemical compound of sodium, boron, and oxygen, with formula , or . It is a sodium salt of the orthoboric acid . The compound is also called trisodium orthoborate, sodium orthoborate, or just sodium borate. However, "sodium orthoborate" has been used also for a compound with formula , which would correspond to an equimolar mixture of sodium metaborate and trisodium borate proper. and "sodium borate" is sometimes used in the generic sense, for a sodium salt with any of several other borate anions. Preparation Sodium carbonate will react with sodium metaborate or boric oxide to form the orthoborate and carbon dioxide when heated between 600 and 850 °C: : Difficult to obtain in pure form from melts. Properties Reactions When dissolved in water, the orthoborate anion partially hydrolyzes into metaborate and hydroxide : : Electrolysis of a solution of sodium orthoborate generates sodium perborate at the anode An anode usually is an electrod ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Boric Acid
Boric acid, more specifically orthoboric acid, is a compound of boron, oxygen, and hydrogen with formula . It may also be called hydrogen orthoborate, trihydroxidoboron or boracic acid. It is usually encountered as colorless crystals or a white powder, that dissolves in water, and occurs in nature as the mineral sassolite. It is a weak acid that yields various borate anions and salt (chemistry), salts, and can react with Alcohol (chemistry), alcohols to form borate esters. Boric acid is often used as an antiseptic, insecticide, flame retardant, neutron absorber, or precursor to other boron compounds. The term "boric acid" is also used generically for any oxyacid of boron, such as metaboric acid and tetraboric acid . History Orthoboric acid was first prepared by Wilhelm Homberg (1652–1715) from borax, by the action of mineral acids, and was given the name ("sedative salt of Homberg"). However, boric acid and borates have been used since the time of the ancient Greece, anc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
