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Encyclopedia > Calcium hydroxide
Calcium hydroxide
Calcium hydroxide
Systematic name Calcium hydroxide
Other names Calcium(II) hydroxide,
slaked lime,
hydrated lime.
Molecular formula Ca(OH)2
Molar mass 74.093 g/mol
Appearance Soft white powder/Colourless liquid
Crystal Structure hexagonal
CAS number [1305-62-0]
Density and phase 2.211 g/cm³, solid
Solubility in water 0.185g/100 cm³
Ksp = 4.68 × 10−6
Melting point 580°C (Decomposes).
Boiling point N/A
Basicity (pKb) -2.37
Specific Heat Capacity 1.18095 J/g-°C
Heat of formation -985.2 kJ/mol
MSDS External MSDS
EU classification Corrosive (C)
R-phrases R34, R36, R37, R38,
S-phrases S22, S26, S39, S45.
NFPA 704 N/A
Flash point Non-flammable.
Supplementary data page
Structure and
n, εr, etc.
Phase behaviour
Solid, liquid, gas
Spectral data UV, IR, NMR, MS
Related compounds
Other anions None listed.
Other cations None listed.
Related bases Calcium oxide.
Except where noted otherwise, data are given for
materials in their standard state (at 25 °C, 100 kPa)
Infobox disclaimer and references

Calcium hydroxide is a chemical compound with the chemical formula Ca(OH)2. It is a colourless crystal or white powder, and is obtained when calcium oxide (called lime or quicklime) is slaked with water. It can also be precipitated by mixing an aqueous solution of calcium chloride and an aqueous solution of sodium hydroxide. A traditional name for calcium hydroxide is slaked lime, or hydrated lime. The name of the natural mineral is portlandite. Image File history File links Please see the file description page for further information. ... It has been suggested that this article or section be merged with Calcium hydroxide. ... Image File history File links A sample of Calcium hydroxide. ... IUPAC nomenclature is a system of naming chemical compounds and of describing the science of chemistry in general. ... This article does not cite its references or sources. ... Molar mass is the mass of one mole of a chemical element or chemical compound. ... Enargite crystals In mineralogy and crystallography, a crystal structure is a unique arrangement of atoms in a crystal. ... A regular hexagon A hexagon (also known as sexagon) is a polygon with six edges and six vertices. ... CAS registry numbers are unique numerical identifiers for chemical compounds, polymers, biological sequences, mixtures and alloys. ... In physics, density is mass m per unit volume V. For the common case of a homogeneous substance, it is expressed as: where, in SI units: ρ (rho) is the density of the substance, measured in kg·m-3 m is the mass of the substance, measured in kg V is... In the physical sciences, a phase is a set of states of a macroscopic physical system that have relatively uniform chemical composition and physical properties (i. ... Solubility refers to the ability for a given substance, the solute, to dissolve in a solvent. ... “HOH” redirects here. ... It has been suggested that this article or section be merged with chemical equilibrium. ... The melting point of a crystalline solid is the temperature at which it changes state from solid to liquid. ... The boiling point of a substance is the temperature at which it can change its state from a liquid to a gas throughout the bulk of the liquid at a given pressure. ... The acid dissociation constant (Ka), also known as the acidity constant or the acid-ionization constant, is a specific equilibrium constant for the reaction of an acid with its conjugate base in aqueous solution [1]. // When an acid dissolves in water, it partly dissociates forming hydronium ions and its conjugate... Specific heat capacity, also known simply as specific heat (Symbol: C or c) is the measure of the heat energy required to raise the temperature of a given amount of a substance by one degree. ... The standard enthalpy of formation or standard heat of formation of a compound is the change of enthalpy that accompanies the formation of 1 mole of a substance in its standard state from its constituent elements in their standard states (the most stable form of the element at 100 kPa... An example MSDS in a US format provides guidance for handling a hazardous substance and information on its composition and properties. ... This page provides supplementary chemical data on calcium hydroxide. ... Council Directive 67/548/EEC of 27 June 1967 on the approximation of laws, regulations and administrative provisions relating to the classification, packaging and labelling of dangerous substances (as amended) is the main source of European Union law concerning chemical safety. ... R-phrases are defined in Annex III of European Union Directive 67/548/EEC: Nature of special risks attributed to dangerous substances and preparations. ... S-phrases are defined in Annex IV of European Union Directive 67/548/EEC: Safety advice concerning dangerous substances and preparations. ... NFPA 704 is a standard maintained by the U.S. National Fire Protection Association. ... The flash point of a flammable liquid is the lowest temperature at which it can form an ignitable mixture with air. ... This page provides supplementary chemical data on calcium hydroxide. ... This page provides supplementary chemical data on calcium hydroxide. ... The refractive index (or index of refraction) of a medium is a measure for how much the speed of light (or other waves such as sound waves) is reduced inside the medium. ... The relative dielectric constant of a material under given conditions is a measure of the extent to which it concentrates electrostatic lines of flux. ... This page provides supplementary chemical data on calcium hydroxide. ... This page provides supplementary chemical data on calcium hydroxide. ... Ultraviolet-Visible Spectroscopy or Ultraviolet-Visible Spectrophotometry (UV/ VIS) involves the spectroscopy of photons (spectrophotometry). ... Infrared spectroscopy (IR Spectroscopy) is the subset of spectroscopy that deals with the IR region of the EM spectrum. ... It has been suggested that NMR Data Processing be merged into this article or section. ... Mass spectrometry (also known as mass spectroscopy (deprecated)[1] or informally, mass-spec and MS) is an analytical technique used to measure the mass-to-charge ratio of ions. ... “Multivalent” redirects here. ... “Multivalent” redirects here. ... Acids and bases: Acid-base reaction pH Self-ionization of water Buffer solutions Systematic naming Acid-base extraction Acidity function Proton affinity Acids: Strong acids Weak acids Superacids Lewis acids Mineral acids Organic acids Bases: Strong bases Weak bases Superbases Lewis bases Organic bases edit In chemistry, a base is... Calcium oxide (CaO), commonly known as lime, quicklime or burnt lime, is a widely used chemical compound. ... In chemistry, the standard state of a material is its state at 1 bar (100 kilopascals) and 25 degrees Celsius (298. ... A chemical compound is a chemical substance consisting of two or more different chemically bonded chemical elements, with a fixed ratio determining the composition. ... General Name, Symbol, Number calcium, Ca, 20 Chemical series alkaline earth metals Group, Period, Block 2, 4, s Appearance silvery white Standard atomic weight 40. ... Hydroxide is a polyatomic ion consisting of oxygen and hydrogen: OH− It has a charge of −1. ... Calcium oxide (CaO), commonly known as lime, quicklime or burnt lime, is a widely used chemical compound. ... Impact from a water drop causes an upward rebound jet surrounded by circular capillary waves. ... Calcium chloride is a chemical compound of calcium and chlorine. ... Sodium hydroxide (NaOH), also known as lye or caustic soda, is a caustic metallic base. ... It has been suggested that this article or section be merged with Calcium hydroxide. ...

If heated to 512°C,[1] calcium hydroxide decomposes into calcium oxide and water. A suspension of fine calcium hydroxide particles in water is called milk of lime. The solution is called lime water and is a medium strength base that reacts violently with acids and attacks many metals in presence of water. It turns milky if carbon dioxide is passed through, due to precipitation of calcium carbonate. Chemical decomposition or analysis is the fragmentation of a chemical compound into elements or smaller compounds. ... Lime water or milk of lime is the common name for saturated calcium hydroxide solution. ... The common (Arrhenius) definition of a base is a chemical compound that either donates hydroxide ions or absorbs hydrogen ions when dissolved in water. ... Acidity redirects here. ... Hot metal work from a blacksmith In chemistry, a metal (Greek: Metallon) is an element that readily loses electrons to form positive ions (cations) and has metallic bonds between metal atoms. ... Carbon dioxide is a chemical compound composed of one carbon and two oxygen atoms. ... Calcium carbonate is a chemical compound, with chemical formula CaCO3. ...



Because of its strong basic properties, calcium hydroxide has varied uses, such as:

Sewage treatment, or domestic wastewater treatment, is the process of removing contaminants from wastewater, both runoff and domestic. ... Whitewash, or calcimine, kalsomine, or calsomine is a type of inexpensive paint made from slaked lime (calcium hydroxide) and chalk (whiting). ... Mortar holding weathered bricks. ... // Gypsum plaster Plaster of Paris, or simply plaster, is a type of building material based on calcium sulfate hemihydrate, nominally (CaSOâ‚„)â‚‚*Hâ‚‚O. It is created by heating gypsum to about 150 ℃, 2(CaSOâ‚„ · 2Hâ‚‚O) → (CaSOâ‚„)â‚‚ · Hâ‚‚O + 3 Hâ‚‚O (released as steam). ... In chemistry, an alkali (from Arabic: al-qalyالقلوي, القالي ) is a basic, ionic salt of an alkali metal or alkali earth metal element. ... Sodium hydroxide (NaOH), also known as lye or caustic soda, is a caustic metallic base. ... A relaxer is a special type of lotion or creme usually containing a strong alkaline (although it can also contain perm salt) used in the treatment hair with a type of permanent. ... Chemical Depilatories are cosmetic preparations used to remove the hair from the skin on the human body. ... It has been suggested that this article or section be merged into Marine aquarium. ... A seaweed (Laurencia) up close: the branches are multicellular and only about 1 mm thick. ... Giant African Snail (Achatina fulica) The name snail applies to most members of the molluscan Class Gastropoda that have coiled shells. ... The name tube worm describes several groups of marine worms that secrete tubes which they then inhabit, emerging to filter feed. ... A coral reef can be an oasis of marine life. ... Tanned leather in Marrakech This article or section does not cite any references or sources. ... Acidity redirects here. ... The Oil industry brings to market what is currently considered the lifeblood of nearly all other industry, if not industrialized civilization itself. ... Look up Additive in Wiktionary, the free dictionary When used as a noun, additive refers to something that is introduced to a larger quantity of something else, usually to alter characteristics of the larger quantity. ... Pumpjack pumping an oil well near Sarnia, Ontario Petroleum (from Greek petra – rock and elaion – oil or Latin oleum – oil ) or crude oil is a thick, dark brown or greenish liquid. ... Stearic acid, also called octadecanoic acid, is one of the useful types of saturated fatty acids that comes from many animal and vegetable fats and oils. ... The food industry is the complex, global collective of diverse businesses that together supply much of the food energy consumed by the world population. ... This article does not cite its references or sources. ... A soft drink is a drink that contains no alcohol. ... Brine is water saturated or nearly saturated with salt. ... Carbonate is an anion with a charge of -2 and an empirical formula of CO32-. An aqueous solution of carbon dioxide contains a minute amount of H2CO3, called carbonic acid, which dissociates to form hydrogen ions and carbonate ions. ... General Name, Symbol, Number magnesium, Mg, 12 Chemical series alkaline earth metals Group, Period, Block 2, 3, s Appearance silvery white Standard atomic weight 24. ... A Hupa man. ... Latin America consists of the countries of South America and some of North America (including Central America and some the islands of the Caribbean) whose inhabitants mostly speak Romance languages, although Native American languages are also spoken. ... Nixtamalization is the process whereby ripe maize grains are soaked and cooked in an alkaline solution, usually lime based, to cause the transparent outer hull, the pericarp, to separate from the grain. ... Petrochemicals are chemical products made from raw materials of petroleum (hydrocarbon) origin. ... A brake is a device for slowing or stopping the motion of a machine or vehicle, and to keep it from starting to move again. ... Ebonite is one of the earliest forms of plastic. ... This article does not cite its references or sources. ... A cropduster spreading pesticide. ... This page may meet Wikipedias criteria for speedy deletion. ... For other uses, see Fruit (disambiguation). ... A plate of vegetables Vegetable is a culinary term which generally refers to an edible part of a plant. ... A Dentist and Dental Assistant perform surgery on a patient. ... This article or section does not cite any references or sources. ...

Health risks

An overdose of calcium hydroxide can have dangerous symptoms, including: The term symptom (from the Greek meaning chance, mishap or casualty, itself derived from συμπιπτω meaning to fall upon or to happen to) has two similar meanings in the context of physical and mental health: Strictly, a symptom is a sensation or change in health function experienced by a patient. ...

  • Difficulty in breathing[citation needed]
  • Internal bleeding[citation needed]
  • Hypotension[citation needed]
  • Skeletal muscle paralysis, interference with actin-myosin system.
  • An increase in blood pH, which is damaging to the internal organs.[citation needed]

This article or section does not adequately cite its references or sources. ... In physiology and medicine, hypotension refers to an abnormally low blood pressure. ... The correct title of this article is . ...

External links

  • http://www.omri.org/CaOH_final.pdf
  • MSDS Data Sheet.


  1. ^ Temperature at which H2O vapor pressure reaches 101 kPa, Halstead, Moore, J.Chem.Soc (1957) 3873
  • Links to external chemical sources



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