CALCIUM HYDROXIDE

Ca(OH)2, colorless crystal or white powder. It is prepared by reacting calcium oxide (lime) with water, a process called slaking, and is also known as hydrated lime or slaked lime. When heated above 580 degrees Celsius it dehydrates, forming the oxide. Like the oxide, it has many uses, e.g., in liming soil, in sugar refining, and in preparing other compounds. It is a strong base and is widely used as an inexpensive alkali, often as a suspension in water (milk of lime); it is used in leather tanning to remove hair from hides. It is used in whitewash, mortar, and plaster. It is only slightly soluble in water, about 0.2 grams per 100 cubic centimeters, so its solutions are weakly basic. Limewater is a clear, saturated water solution of calcium hydroxide. It is used in medicine to treat acid burns and as an antacid. Because calcium hydroxide readily reacts with carbon dioxide, CO2, to form calcium carbonate, a mixture of gases can be tested for the presence of CO2 by shaking it with limewater in a clear container; if CO2 is present, a cloudy calcium carbonate precipitate will form.

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The Columbia Encyclopedia, Sixth Edition Copyright© 2004, Columbia University Press. Licensed from Lernout & Hauspie Speech Products N.V. All rights reserved.

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Questia Books and Articles on: Calcium Hydroxide
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books on: Calcium Hydroxide  - 157 results

       More book Results: 1-10 11-20 21-30 31-40 41-50 >>  
 
1.
Old Master Prints and Drawings: A Guide to Preservation and Conservation
Book by Carlo James, Marjorie B. Cohn, Caroline Corrigan, Marie Christine Enshaian, Marie Rose Greca; Amsterdam University Press, 1997
Subjects: Drawing--Conservation And Restoration, Paper--Preservation, Prints--Conservation And Restoration
...immersion of the paper in a solution of calcium hydroxide, followed by a second immersion in a calcium bicarbonate bath, the last in order...sensitive to alkali, but far less than calcium hydroxide. In such cases, the authors suggest...
2.
Origins of Life on the Earth and in the Cosmos
Book by Geoffrey Zubay; Academic Press, 2000
Subjects: Life--Origin
...high pHs generated by calcium hydroxide led us to seek milder...situation in the presence of calcium hydroxide; it just...limitations of the magnesium hydroxide system, we used this...they were in parallel calcium hydroxide experiments...
3.
Basics of Environmental Science
Book by Michael Allaby; Routledge, 2000
Subjects: Environmental Sciences
...of limestone converts calcium carbonate to calcium oxide, or quicklime CaO , with the release...the subsequent addition of water produces calcium hydroxide Ca OH 2 , or slaked lime. Calcium oxide is used mainly in the chemical process...
4.
Halal Food Production
Book by Mian N. Riaz, Muhammad M. Chaudry; CRC Press, 2004
Subjects: Food Industry And Trade
...in Foods E-524 Sodium hydroxide Halal E-525 Potassium hydroxide Halal E-526 Calcium hydroxide Halal E-527...hydroxide Halal E-529 Calcium oxide Halal E-530 Magnesium...ferrocyanide Halal E-538 Calcium ferrocyanide Halal E-540...
5.
Teaching Chemistry with Models
Book by R. T. Sanderson; D. Van Nostrand, 1962
Subjects: Atoms--Models, Chemistry, Chemistry--Study and teaching
...from water, leaving the hydroxide ion, which is now a better...drawn from the water. The hydroxide ion then donates an electron pair to the positive calcium: CaO + H 2 O CAOH...this particular product "calcium hydroxide," but it is...
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journal articles on: Calcium Hydroxide  - 33 results

       More journal Results: 1-10 11-20 21-30 31-33 >>  
 
1.
Eye Exposure to Optical Radiation in the Glassblowing Industry: an Investigation in Southern Ontario
Journal article by Olanrewaju M. Oriowo, B. Ralph Chou, Anthony P. Cullen; Canadian Journal of Public Health, Vol. 91, 2000
Subjects: Calcium Compounds, Cobalt, Eyes & eyesight, Glass industry, Occupational health & safety, Ontario Canada, Oxides, Quartz, Radiation, Silicates, Sodium Hydroxide, soda lime
2.
The History and Practice of Shell Tempering in the Middle Atlantic: a Useful Balance
Journal article by Joseph M. Herbert; Southeastern Archaeology, Vol. 27, 2008
Subjects: Coastal plains, Historic buildings & sites, Museums, National parks
...and when cooled, the hygroscopic calcium oxide (or quick lime) that is...or slake) expand, and form calcium hydroxide (CaOH^sub 2^). If this occurs...It has also been suggested that calcium decomposition may be mitigated...
3.
Archaeology of an Early 20th Century Carcass Disposal Pit, Division of Veterinary Medicine, Iowa State College
Journal article by David J. Rapson, Matthew G. Hill, George W. Beran; Plains Anthropologist, Vol. 52, 2007
Subjects: Anatomy & physiology, Awards & honors, Campuses, Facilities planning, Field study, Historic preservation, Hospitals, Preventive medicine, Veterinary colleges
...effect of liming the pits, by adding either calcium oxide (lime) or calcium hydroxide (a.k.a. slaked lime), is not clear...deposit, either calcium oxide (lime) or calcium hydroxide (a.k.a. slaked lime), is provided by...
4.
When the Lights Go out in Cheshire
Journal article by Geoffrey L. Buckley, Nancy R. Bain, Donald L. Swan; The Geographical Review, Vol. 95, 2005
Subjects: Coal--Usage, Company towns--Energy use, Company towns--Natural resources, Electric power plants--Location, Electric power-plants--Location, Electric power--Evaluation, Electric utilities--Buildings and facilities, Electric utilities--Management, Environmental justice--Forecasts and trends, Power plants--Location
...clouds that had plagued the town the previous summer. The company intended to inject water, magnesium hydroxide, and calcium hydroxide at various stages of the combustion and pollution-control processes (Downing 2002a; Kelly 2002d...
5.
An Introduction to Semantic Modeling for Logistical Systems
Journal article by David L. Brock, Edmund W. Schuster, Stuart J. Allen, Pinaki Kar; Journal of Business Logistics, Vol. 26, 2005
Subjects: Logistics, Models, Semantics, Studies, Supply chains
...example from chemistry, a single element like Calcium (Ca) can become part of many different molecules such as calcium hydroxide (CaOH) or calcium chloride (CaCl) through chemical reactions...
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magazine articles on: Calcium Hydroxide  - 36 results

       More magazine Results: 1-10 11-20 21-30 31-36 >>  
 
1.
What's in an Antacid?
Magazine article by Tom Cramer; FDA Consumer, Vol. 26, January 1992
Subjects: Aluminum--Physiological aspects, Antacids--Composition, Calcium (Metal)--Physiological aspects, Calcium--Physiological aspects, Magnesium--Physiological aspects, Sodium--Physiological aspects
...form of calcium carbonate or calcium phosphate are potent and fast...Regular or heavy doses of calcium (more than five or six times...carbonate, glycinate, hydroxide, oxide, trisilicate, and...aluminum combinations.) Like calcium, magnesium may cause kidney...
2.
Now You Co2, Now You Don't a Radical Approach to Climate Change: Re-engineer the Earth So That Fossil Fuels Do Less Damage
Magazine article by Michael Behar; Popular Science, Vol. 267, August 2005
Subjects: Carbon dioxide, Climate change, Earth, Environmental impact, Fossil fuels
...molecules as they drifted past in the wind. Sodium hydroxide or calcium hydroxide--chemicals that bind with carbon dioxide...slowly reacted with other chemicals to create calcium carbonate, or limestone--the pinkish bands striping...
3.
Heading off Hair-Care Disasters
Magazine article by Michelle Meadows; FDA Consumer, Vol. 35, January 2001
Subjects: Hair colorings--Product defects and recalls, Hair dyes--Product defects and recalls, Hair relaxers, Hair--Relaxing, Toiletries industry--Product defects and recalls, United States. Food and Drug Administration--Reports
...if used incorrectly. Lye relaxers contain sodium hydroxide as the active ingredient. With "no lye" relaxers, calcium hydroxide and guanidine carbonate are mixed to produce guanidine hydroxide. Research has shown that this combination in...
4.
Diego Rivera: A Retrospective
Magazine article by Arthur C. Danto; The Nation, Vol. 243, July 19, 1986
Subjects: Artists, Mexican--Exhibitions, Mexican artists--Exhibitions, Mural painting and decoration--Exhibitions, Mural painting--Exhibitions, Rivera, Diego--Exhibitions
...endure. Washed onto damp plaster, pigment is absorbed by capillary action and a film of calcium hydroxide is formed which interacts with air to become calcium carbonate. Impervious so water, an indiferrent to light as tiles, physically one with...
5.
Cleaning Treasures: Safer Solvents for Restoring Frescoes
Magazine article by D. Castelvecchi; Science News, Vol. 171, May 19, 2007
Subjects: Cleaning agents--Usage, Cleaning compounds--Usage, Fresco painting--Management, Fresco painting--Protection and preservation, Solvents--Chemical properties, Solvents--Composition
...the Florence team favors the use of nanoparticles of calcium hydroxide, or slaked lime. These can also penetrate the paints...natural way of integrating them with the original, calcium carbonate-based paints. Ramon Carrasco, an archaeologist...
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newspaper articles on: Calcium Hydroxide  - 8 results

       More newspaper Results: 1-8 >>  
 
1.
Why Are Women Being Used as Guinea Pigs for Facial Fillers? of the 147 Face-Plumping Injectables Now Available, Just Seven Are Approved
Newspaper article; The Mail on Sunday (London, England), October 3, 2010
...use by the FDA are: Juvederm: Hyaluronic acid Perlane: Hyaluronic acid Restylane: Hyaluronic acid Radiesse: Calcium hydroxide Zyderm: Bovine collagen Sculptra: (not strictly speaking a filler - it stimulates bodys own collagen production...
2.
Why Are Women Being Used as Guinea Pigs for Facial Fillers? of 147 Plumping Injectables Now Available, Just Seven Are Approved
Newspaper article; The Daily Mail (London, England), October 5, 2010
...use by the FDA are: Juvederm: Hyaluronic acid Perlane: Hyaluronic acid Restylane: Hyaluronic acid Radiesse: Calcium hydroxide Zyderm: Bovine collagen Sculptra: (not strictly speaking a filler -- it stimulates bodys own collagen production...
3.
Smooth Operators; Pin-Perfect: But Which Hair-Removal Option Is Right for You?
Newspaper article; The Evening Standard (London, England), May 13, 2008
...ingredients means its a good option for people with sensitiveskin. Depilatory creams Use a mixture of sodium hydroxide and calcium hydroxide tomelt away the hair. Messy, smelly, can cause irritation and it last only aslong as shaving. Electrolysis...
4.
Dig This
Newspaper article; Evening Chronicle (Newcastle, England), November 11, 2006
...acidity or alkalinity of the soil). This figure can be adjusted by applications of lime, either white lime which is calcium hydroxide or yellow lime which is ground up dolomite or magnesium lime. The latter is less hazardous and tends to slow release...
5.
Medicine Cabinet Must-Haves
Newspaper article; Manila Bulletin, February 20, 2010
Subjects: Emergency medicine, Nonprescription drugs
...for medication. Good products to have on hand for heartburn include calcium carbonate, the active ingredient in TUMS or something that contains aluminum or magnesium hydroxide Treatment for diarrhea usually isn rsquo;t necessary, though you...
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encyclopedia articles on: Calcium Hydroxide  - 26 results

       More encyclopedia Results: 1-10 11-20 21-26 >>  
 
1.
Calcium Hydroxide
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
CALCIUM HYDROXIDE Ca(OH) 2 , colorless crystal or white powder. It is prepared by reacting calcium oxide (lime) with water, a process...a clear, saturated water solution of calcium hydroxide. It is used in medicine to...
2.
Sodium Hydroxide
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
SODIUM HYDROXIDE chemical compound, NaOH, a white...purity. The major use of sodium hydroxide is as a chemical and in the manufacture...carbonate (soda) is reacted with calcium hydroxide (slaked lime); calcium carbonate precipitates, leaving...
3.
Hydroxide
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
...litmus from red to blue. Alkali metal hydroxides such as sodium hydroxide are strong bases and are very soluble in water; alkaline earth metal hydroxides such as calcium hydroxide (slaked lime) are much less soluble...
4.
Calcium Oxide
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
...bleaching powder , calcium carbide, and calcium cyanamide; in water softeners; and...the flame of an oxyhydrogen torch. Calcium oxide is a basic anhydride, reacting with water to form calcium hydroxide ; during the reaction (slaking) much...
5.
Calcium
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
...of the periodic table . Calcium is chemically active...with water, forming the hydroxide. It combines with other...compounds. Although lime (calcium oxide) has been known since ancient times, elemental calcium was first isolated by Sir...
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