Difference between revisions of "Calcium hydroxide"
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== Description == | == Description == | ||
| − | A soft, white, alkaline powder. Calcium hydroxide, or slaked lime, is made by grinding quicklime ([ | + | A soft, white, alkaline powder. Calcium hydroxide, or slaked lime, is made by grinding quicklime ([[calcium oxide]]) with water; this forms a fine-grain precipitate. Calcium hydroxide absorbs carbon dioxide from the air forming [[calcium carbonate]]. It is used as a component in hydraulic cements because it will set underwater. Calcium hydroxide is also used to dehair hides, to kill insects, as a preservative in water paints and as a neutralizing agent in paper pulp solutions. A saturated solution of calcium hydroxide, called [[limewater]], has a pH of 12.4. |
== Synonyms and Related Terms == | == Synonyms and Related Terms == | ||
| − | calcium dihydroxide; slaked lime; calcium hydrate; lime hydrate; caustic lime; limewater | + | calcium (II) hydroxide; calcium dihydroxide; slaked lime; calcium hydrate; lime hydrate; caustic lime; limewater; milk of lime |
| − | == | + | == Risks == |
| − | Soluble in | + | * Skin contact causes irritation. |
| + | * Fisher Scientific: [https://beta-static.fishersci.com/content/dam/fishersci/en_US/documents/programs/education/regulatory-documents/sds/chemicals/chemicals-c/S25225.pdf SDS] | ||
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| + | == Physical and Chemical Properties == | ||
| + | |||
| + | Soluble in glycerol, acids. Slightly soluble in water. pH = 12.4 (saturated solution)Insoluble in alcohols. | ||
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| − | == | + | == Resources and Citations == |
| − | + | * Wikipedia: [https://en.wikipedia.org/wiki/Calcium_hydroxide Calcium hydroxide] Accessed Sept 2022 | |
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| − | + | * T.Schaeffer, V.Blythe-Hill, J.Druzik "Aqueous Light Bleaching of Paper: Comparison of Calcium Hydroxide and Magnesium Bicarbonate Bathing Solutions" JAIC, 35:219-238, 1996. | |
* Richard S. Lewis, ''Hawley's Condensed Chemical Dictionary'', Van Nostrand Reinhold, New York, 10th ed., 1993 | * Richard S. Lewis, ''Hawley's Condensed Chemical Dictionary'', Van Nostrand Reinhold, New York, 10th ed., 1993 | ||
Latest revision as of 10:59, 14 September 2022
Description
A soft, white, alkaline powder. Calcium hydroxide, or slaked lime, is made by grinding quicklime (Calcium oxide) with water; this forms a fine-grain precipitate. Calcium hydroxide absorbs carbon dioxide from the air forming Calcium carbonate. It is used as a component in hydraulic cements because it will set underwater. Calcium hydroxide is also used to dehair hides, to kill insects, as a preservative in water paints and as a neutralizing agent in paper pulp solutions. A saturated solution of calcium hydroxide, called Limewater, has a pH of 12.4.
Synonyms and Related Terms
calcium (II) hydroxide; calcium dihydroxide; slaked lime; calcium hydrate; lime hydrate; caustic lime; limewater; milk of lime
Risks
- Skin contact causes irritation.
- Fisher Scientific: SDS
Physical and Chemical Properties
Soluble in glycerol, acids. Slightly soluble in water. pH = 12.4 (saturated solution)Insoluble in alcohols.
| Composition | Ca(OH)2 |
|---|---|
| CAS | 1305-62-0 |
| Melting Point | 580 (dec) |
| Density | 2.08-2.34 |
| Molecular Weight | mol. wt. = 74.1 |
Resources and Citations
- Wikipedia: Calcium hydroxide Accessed Sept 2022
- T.Schaeffer, V.Blythe-Hill, J.Druzik "Aqueous Light Bleaching of Paper: Comparison of Calcium Hydroxide and Magnesium Bicarbonate Bathing Solutions" JAIC, 35:219-238, 1996.
- Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
- The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983
- G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 505
- Matt Roberts, Don Etherington, Bookbinding and the Conservation of Books: a Dictionary of Descriptive Terminology, U.S. Government Printing Office, Washington DC, 1982
- Hermann Kuhn, Conservation and Restoration of Works of Art and Antiquities, Butterworths, London, 1986
- The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998
- Book and Paper Group, Paper Conservation Catalog, AIC, 1984, 1989