释义 |
boric acid
boric acidn. A water-soluble white or colorless crystalline compound, H3BO3, used as an antiseptic and preservative and in fireproofing compounds, cosmetics, ophthalmic solutions, cements, and enamels.boric acid n 1. (Elements & Compounds) Also called: orthoboric acid a white soluble weakly acid crystalline solid used in the manufacture of heat-resistant glass and porcelain enamels, as a fireproofing material, and as a mild antiseptic. Formula: H3BO3. Systematic name: trioxoboric(III) acid 2. (Elements & Compounds) any other acid containing boron bo′ric ac′id n. 1. a white, crystalline acid, H3BO3, used chiefly in the manufacture of ceramics, cements, and glass and as an antiseptic. 2. any of a group of acids containing boron. [1865–70] bo·ric acid (bôr′ĭk) A white or colorless crystalline compound, H3BO3, either naturally occurring or made from borax. It is used as an antiseptic and preservative, and in cements, enamels, and cosmetics.ThesaurusNoun | 1. | boric acid - a white or colorless slightly acid solid that is soluble in water and ethanol; used in the manufacture of glass and paper and adhesives and in detergents and as a flux in welding; also used as an antiseptic and food preservativeorthoboric acidacid - any of various water-soluble compounds having a sour taste and capable of turning litmus red and reacting with a base to form a salt | | 2. | boric acid - any of various acids containing boron and oxygenboracic acidacid - any of various water-soluble compounds having a sour taste and capable of turning litmus red and reacting with a base to form a saltperboric acid - a form of boric acid | Translationsboric acid
boric acid, any one of the three chemical compounds, orthoboric (or boracic) acid, metaboric acid, and tetraboric (or pyroboric) acid; the term often refers simply to orthoboric acid. The acids may be thought of as hydrates of boric oxide, B2O3. Orthoboric acid, H3BO3 or B2O3·3H2O, is colorless, weakly acidic, and forms triclinic crystals. It is fairly soluble in boiling water (about 27% by weight) but less so in cold water (about 6% by weight at room temperature). When orthoboric acid is heated above 170°C; it dehydrates, forming metaboric acid, HBO2 or B2O3·H2O. Metaboric acid is a white, cubic crystalline solid and is only slightly soluble in water. It melts at about 236°C;, and when heated above about 300°C; further dehydrates, forming tetraboric acid, H4B4O7 or B2O3·H2O. Tetraboric acid is either a vitreous solid or a white powder and is water soluble. When tetraboric or metaboric acid is dissolved it reverts largely to orthoboric acid. The major uses of the boric acids are in forming other boron compounds and in borate salts, e.g., boraxborax or sodium tetraborate decahydrate , chemical compound, Na2B4O7·10H2O; sp. gr. 1.73; slightly soluble in cold water; very soluble in hot water; insoluble in acids. ..... Click the link for more information. . A dilute water solution of boric acid is commonly used as a mild antiseptic and eyewash. Boric acid is also used in leather manufacture, electroplating, and cosmetics. Boric acid can be crystallized from an acidified borax solution. It occurs as the mineral sassolite in the Tuscan region of Italy, where it is also recovered from hot springs and vapors. In the United States boric acid is recovered from brines from Searles Lake in California.Boric Acid (also orthoboric acid), H3BO3, a weak inorganic tribasic acid; colorless crystals in the form of flakes. Density, 1.48 g/cm3. Moderately soluble in cold water and more soluble in hot water, which is used to purify it (solubility per 100 g H2O: 2.66 g at 0° C; 39.7 g at 100° C). Boric acid is soluble in alcohol and other organic substances. When heated it loses water, turning first into metaboric acid, HBO2, and then into boric anhydride, B2O3. The salts of boric acid—borates—are derived mainly from various polyboric acids with the general formula nB2O3 · mH2O. When boric acid reacts with alcohols in the presence of concentrated H2SO4 (for bonding water), esters—for example, boric methyl ester—are formed: 3CH3OH + H3BO3 = B(OCH3)3 + 3H2O When ignited, the esters of boric acid burn with a green flame, which is a qualitative reaction for boron. Boric acid is found in nature in hot springs as a dissolved form and as vapor. It evolves in the form of the mineral sassolite from hot springs and excrustations in volcanic craters. The industrial significance of natural boric acid is relatively small; it is usually obtained during the processing of borates. Large quantities of boric acid are used to produce enamel wares. In laboratory practice boric acid is used in the preparation of buffer systems. In medicine it is used as an antiseptic. Aqueous solutions of boric acid serve as mouth and throat rinses and eyewashes. Ointments, pastes, and powders with boric acid and boric alcohol (boric acid dissolved in alcohol) are administered for some skin diseases (boric alcohol is also prescribed as ear drops). Boric acid is an ingredient in contraceptives. V. L. VASILEVSKII boric acid[¦bȯr·ik ′as·əd] (inorganic chemistry) H3BO3 An acid derived from boric oxide in the form of white, triclinic crystals, melting at 185°C, soluble in water. Also known as boracic acid; orthoboric acid. boric acid1. a white soluble weakly acid crystalline solid used in the manufacture of heat-resistant glass and porcelain enamels, as a fireproofing material, and as a mild antiseptic. Formula: H3BO3 2. any other acid containing boron boric acid
boric acid [bor´ik] a mild acid used as a buffer. It was formerly used as a household antiseptic for treating minor irritations of the skin and eyes. Because the powder is highly poisonous when taken internally, and since other antiseptics are more effective, boric acid is no longer recommended. Boric acid ointment (for external use only) occasionally helps in cases of mild skin irritations and keeps gauze dressing from sticking to a wound. It is also used as a pesticide to kill ants and cockroaches.bo·ric ac·id (bō'rik as'id), A weak acid, used as an antiseptic dusting powder, in saturated solution as a collyrium, and with glycerin in aphthae and stomatitis. Synonym(s): boracic acidboric acidn. A water-soluble white or colorless crystalline compound, H3BO3, used as an antiseptic and preservative and in fireproofing compounds, cosmetics, ophthalmic solutions, cements, and enamels.bo·ric ac·id (bōr'ik as'id) A weak acid, used as an antiseptic dusting powder, in saturated solution as a collyrium, and with glycerin in aphthae and stomatitis. boric acid A mildly antiseptic drug used externally as a constituent of various skin preparations.bo·ric ac·id (bōr'ik as'id) A weak acid, used as an antiseptic dusting powder, in saturated solution as a collyrium, and with glycerin in cases of aphthae and stomatitis. AcronymsSeeH3BO3boric acid
Synonyms for boric acidnoun a white or colorless slightly acid solid that is soluble in water and ethanolSynonymsRelated Wordsnoun any of various acids containing boron and oxygenSynonymsRelated Words |