Search results
Results from the WOW.Com Content Network
so 2 + 0.5 o 2 + caco 3 → caso 4 + co 2 Related sulfur-trapping methods use lime and some produces an impure calcium sulfite , which oxidizes on storage to calcium sulfate. In the production of phosphoric acid from phosphate rock , calcium phosphate is treated with sulfuric acid and calcium sulfate precipitates.
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.
A calcium bisulfite liquor solution is used in the process of converting dihydroquercetin in tree bark pulp and then converting dihydroquercetin to a usable form: quercetin. Calcium bisulfite is not the optimum bisulfite compound for this reaction since the calcium ions can be removed from the calcium bisulfite solution during the reaction ...
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 name anhydrite was given by A. G. Werner in 1804, because of the absence of water of crystallization, as contrasted with the presence of water in gypsum. Some obsolete names for the species are muriacite and karstenite; the former, an earlier name, being given under the impression that the substance was a chloride (muriate).
Calcium sulfite, or calcium sulphite, is a chemical compound, the calcium salt of sulfite with the formula CaSO 3 ·x(H 2 O). Two crystalline forms are known, the hemihydrate and the tetrahydrate, respectively CaSO 3 ·½(H 2 O) and CaSO 3 ·4(H 2 O). [2] All forms are white solids. It is most notable as the product of flue-gas desulfurization.
Green vitriol is iron(II) sulfate heptahydrate, FeSO 4 ·7H 2 O; blue vitriol is copper(II) sulfate pentahydrate, CuSO 4 ·5H 2 O and white vitriol is zinc sulfate heptahydrate, ZnSO 4 ·7H 2 O. Alum , a double sulfate of potassium and aluminium with the formula K 2 Al 2 (SO 4 ) 4 ·24H 2 O , figured in the development of the chemical industry.
A sulfite sulfate is a chemical compound that contains both sulfite and sulfate anions [SO 3] 2− [SO 4] 2−. These compounds were discovered in the 1980s as calcium and rare earth element salts. Minerals in this class were later discovered. Minerals may have sulfite as an essential component, or have it substituted for another anion as in ...