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Calcium hydroxide WikipediaSlaked lime redirects here. For CaOH2aq, see limewater. Type or paste a DOI name into the text box. Click Go. Your browser will take you to a Web page URL associated with that DOI name. Send questions or comments to doi. Scribd is the worlds largest social reading and publishing site. For the application of slaked lime as a wall colorant, see limewash. Calcium hydroxide. Names. IUPAC name. Calcium hydroxide. Other names. Slaked lime. Milk of lime. CalciumII hydroxide. Type Of Gypsum Board Pdf To Word' title='Type Of Gypsum Board Pdf To Word' />Pickling lime. Hydrated lime. Portlandite. Calcium hydrate. Identifiers. Ch. EBIChem. Spider. ECHA Info. Card. 10. EC Number. 21. 5 1. E number. E5. 26 acidity regulators,. KEGGRTECS number. EW2. 80. 00. 00. UNIIIn. Ch. I1. SCa. 2. H2. Oh 21. H2q2 p 2 YKey AXCZMVOFGPJBDE UHFFFAOYSA L YIn. 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Areas include Design Guidance. Type Of Gypsum Board Pdf To Word' title='Type Of Gypsum Board Pdf To Word' />Ch. I1Ca. 2. H2. Oh 2. H2q2 p 2. Key AXCZMVOFGPJBDE NUQVWONBADCa2. OH. OH OH. OH. Ca2Properties. CaOH2. Molar mass. Appearance. White powder. Odor. Odorless. Density. Melting point. 58. C 1,0. 76 F 8. K loses water, decomposes1. L 0 C1. 7. 3 gL 2. C0. 6. 6 gL 1. C5. Solubility. Basicity p. Kb1. OH, 2. 4. 3 second OH122. Structure. Hexagonal, h. P33P3m. 1 No. 1. Thermochemistry. Jmol1K149. Jmol14Hazards. Safety data sheet. See data page5GHS pictograms. GHS signal word. Danger. H3. 15, H3. 18, H3. H4. 02. P2. 61, P2. P3. 053. 513. 38. NFPA 7. 04. Flash point. Non flammable. Lethal dose or concentration LD, LC 7. US health exposure limits NIOSH TWA 1. TWA 5 mgm. 36N. D. Related compounds. Magnesium hydroxide. Strontium hydroxide. Barium hydroxide. Calcium oxide. Supplementary data page. Refractive index n,Dielectric constant r, etc. Thermodynamicdata. Phase behavioursolidliquidgas. UV, IR, NMR, MSExcept where otherwise noted, data are given for materials in their standard state at 2. C 7. 7 F, 1. 00 k. Pa. Y verify what is YN Infobox references. Calcium hydroxide traditionally called slaked lime is an inorganic compound with the chemical formula CaOH2. It is a colorless crystal or white powder and is obtained when calcium oxide called lime or quicklime is mixed, or slaked with water. It has many names including hydrated lime, caustic lime, builders lime, slack lime, cal, or pickling lime. Calcium hydroxide is used in many applications, including food preparation. Limewater is the common name for a saturated solution of calcium hydroxide. PropertieseditCalcium hydroxide is relatively insoluble in water, with a solubility product. Ksp of 5. 5  1. 06. It is large enough that its solutions are basic according to the following reaction CaOH2 Ca. OHAt ambient temperature, calcium hydroxide portlandite dissolves in pure water to produce an alkaline solution with a p. H of about 1. 2. 4. Calcium hydroxide solutions can cause chemical burns. At high p. H value see common ion effect, its solubility drastically decreases. This behavior is relevant to cement pastes. Aqueous solutions of calcium hydroxide are called limewater and are medium strength bases that reacts with acids and can attack some metals such as aluminium amphoteric hydroxide dissolving at high p. H while protecting other metals from corrosion such as iron and steel by passivation of their surface. Limewater turns milky in the presence of carbon dioxide due to formation of calcium carbonate, a process called carbonatation CaOH2 CO2 Ca. CO3 H2. OWhen heated to 5. C, the partial pressure of water in equilibrium with calcium hydroxide reaches 1. Pa normal atmospheric pressure, which decomposes calcium hydroxide into calcium oxide and water. CaOH2 Ca. O H2. OStructure, preparation, occurrenceeditSEM image of fractured hardened cement paste, showing plates of calcium hydroxide and needles of ettringite micron scaleCalcium hydroxide adopts a polymeric structure, as do all metal hydroxides. The structure is identical to that of MgOH2 brucite structure i. Strong hydrogen bonds exist between the layers. Calcium hydroxide is produced commercially by treating lime with water Ca. O H2. O CaOH2. In the laboratory it can be prepared by mixing aqueous solutions of calcium chloride and sodium hydroxide. The mineral form, portlandite, is relatively rare but can be found in some volcanic, plutonic, and metamorphic rocks. It has also been known to arise in burning coal dumps. The positively charged ionized species Ca. Game Virtual Pool Hall. OH has been detected in the atmosphere of S type stars. Retrograde solubilityeditThe solubility of calcium hydroxide portlandite at 7. C is about half of its value at 2. C. The reason for this not so common behaviour is that the dissolution of calcium hydroxide in water is an exothermic process and also obeys to the Le Chateliers principle. A lowering of temperature will thus favour the elimination of the dissolution heat and increases the equilibrium constant of dissolution of CaOH2, and so increase its solubility at low temperature. This contra intuitive temperature dependence of the solubility is referred to as retrograde or inverse solubility. The differently hydrated phases of calcium sulfate gypsum, bassanite and anhydrite also exhibit a retrograde solubility for the same reason because their dissolution reactions are exothermic. One significant application of calcium hydroxide is as a flocculant, in water and sewage treatment. It forms a fluffy charged solid that aids in the removal of smaller particles from water, resulting in a clearer product. This application is enabled by the low cost and low toxicity of calcium hydroxide. It is also used in fresh water treatment for raising the p. H of the water so that pipes will not corrode where the base water is acidic, because it is self regulating and does not raise the p. H too much. It is also used in the preparation of ammonia gas, using the following reaction CaOH2 2. NH4. Cl 2. NH3 Ca. Cl. 2 2. H2. OAnother large application is in the paper industry, where it is an intermediate in the reaction in the production of sodium hydroxide. This conversion is part of the causticizing step in the Kraft process for making pulp. In the causticizing operation burned lime is added to green liquor which is a solution primarily of sodium carbonate and sodium sulfate produced by dissolving smelt, which is the molten form of these chemicals from the recovery furnace. Food industryeditBecause of its low toxicity and the mildness of its basic properties, slaked lime is widely used in the food industry to Native American useseditIn Spanish, calcium hydroxide is called cal. Maize cooked with cal nixtamalization becomes hominy nixtamal, which significantly increases the bioavailability of niacin, and it is also considered tastier and easier to digest. In chewing coca leaves, calcium hydroxide is usually chewed alongside to keep the alkaloidstimulants chemically available for absorption by the body. Similarly, Native Americans traditionally chewed tobacco leaves with calcium hydroxide derived from burnt mollusc shells to enhance the effects. It has also been used by some indigenous American tribes as an ingredient in yopo, a psychedelic snuff prepared from the beans of some Anadenanthera species. Asian useseditCalcium hydroxide is typically added to a bundle of areca nut and betel leaf to keep the alkaloidstimulants chemically available to enter the bloodstream via sublingual absorption. It is used in making naswar also known as nass or niswar, a type of dipping tobacco made from fresh tobacco leaves, calcium hydroxide chuna, and wood ash. It is consumed most in the Pathan diaspora, Afghanistan, Pakistan, India, Bangladesh.