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Calcium sulfate (or calcium sulphate) is the inorganic compound with the formula CaSO 4 and related hydrates. In the form of γ- anhydrite (the anhydrous form), it is used as a desiccant . One particular hydrate is better known as plaster of Paris , and another occurs naturally as the mineral gypsum .
The following chart shows the solubility of various ionic compounds in water at 1 atm pressure and room temperature (approx. 25 °C, 298.15 K). "Soluble" means the ionic compound doesn't precipitate, while "slightly soluble" and "insoluble" mean that a solid will precipitate; "slightly soluble" compounds like calcium sulfate may require heat to precipitate.
The molar mass of atoms of an element is given by the relative atomic mass of the element multiplied by the molar mass constant, M u ≈ 1.000 000 × 10 −3 kg/mol ≈ 1 g/mol. For normal samples from Earth with typical isotope composition, the atomic weight can be approximated by the standard atomic weight [ 2 ] or the conventional atomic weight.
Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate, with the chemical formula CaSO 4 ·2H 2 O. [4] It is widely mined and is used as a fertilizer and as the main constituent in many forms of plaster, drywall and blackboard or sidewalk chalk.
Bassanite is a calcium sulfate mineral with formula CaSO 4 · 1 / 2 H 2 O or 2CaSO 4 ·H 2 O. In other words it has half a water molecule per CaSO 4 unit, hence its synonym calcium sulfate hemihydrate. Bassanite was first described in 1910 for an occurrence on Mount Vesuvius. It was named for Italian paleontologist Francesco Bassani ...
The production of sulfuric acid from anhydrous calcium sulfate produces calcium silicates. [9] Upon being mixed with shale or marl, and roasted at 1400 °C, the sulfate liberates sulfur dioxide gas, a precursor to sulfuric acid. The resulting calcium silicate is used in cement clinker production. [10] 2 CaSO 4 + 2 SiO 2 + C → 2 CaSiO 3 + 2 SO ...
Calcium nitrate are inorganic compounds with the formula Ca(NO 3) 2 (H 2 O) x. The anhydrous compound, which is rarely encountered, absorbs moisture from the air to give the tetrahydrate . Both anhydrous and hydrated forms are colourless salts .
Biphasic calcium sulfate is a granulated powder composed of calcium sulfate hydrate (CaSO 4 •2H 2 O) and calcium sulfate hemihydrate (CaSO 4 • 1 / 2 H 2 O). [citation needed] It is used primarily as a bone grafting material in dental augmentation procedures such as socket grafting, lateral augmentation, sinus lift, cyst enucleation and more.