An Anhydrate (from the Greek word án(h)ydros meaning "without water") is a chemical compound that does not contain water molecules. These molecules may be present implicitly in the compound itself or they may be present in the outer co-ordination sphere in the case of complexes or ionic salts. The anhydrous form of sulfuric acid, H₂SO₄ is sulfur trioxide, SO₃. Example: When the water from MgSO₄·7H₂O is driven off it becomes MgSO₄, an anhydrous compound. A sphere (< Greek σφαίρα) is a perfectly symmetrical geometrical object. ... Look up complex in Wiktionary, the free dictionary. ... Sulfuric acid (British English: sulphuric acid), H2SO4, is a strong mineral acid. ... Sulfur trioxide (British spelling: Sulphur trioxide) has the chemical formula SO3. ...

Anhydrous compounds may differ radically, both physically and chemically, from their hydrated forms. For example, the hydrated form of copper sulfate (CuSO₄·5H₂O) is blue, whereas the anhydrous form (CuSO₄) is white. The colour is due to the water present in the outer sphere of the complex. PEL-TWA 1 mg/m³(OSHA) IDLH (NIOSH) 100 mg/m3 Flash point non flammable RTECS number GL8800000 Supplementary data page Structure and properties n, εr, etc. ...

NaCl (or table salt) is a common anhydrate. The mineral anhydrite is the anhydrous form of the hydrous mineral gypsum. A magnified crystal of a salt (halite/sodium chloride) In chemistry, a salt is any ionic compound composed of positively charged cations and negatively charged anions so that the product is neutral and without a net charge. ... Minerals are natural compounds formed through geological processes. ... Anhydrite is a mineral - anhydrous calcium sulfate, CaSO4. ... Gypsum is a very soft mineral composed of calcium sulfate dihydrate, with the chemical formula CaSO4·2H2O. // Chemical structure Heating gypsum to between 100°C and 150°C (302°F) partially dehydrates the mineral by driving off exactly 75% of the water contained in its chemical structure. ...

Compare to a hydrate. Hydrates are compounds formed by the union of water with some other substance, generally forming a neutral body, as certain crystallized salts. ...