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Cas Database |
| Name |
Calcium hydroxide |
EINECS | 215-137-3 |
| CAS No. | 1305-62-0 | Density | 2.24 g/cm3 |
| PSA | 40.46000 | LogP | -0.35360 |
| Solubility | 1.65 g/L (20 °C ) in water | Melting Point |
580 °C |
| Formula | Ca(OH)2 | Boiling Point | 2850 °C |
| Molecular Weight | 74.0927 | Flash Point | N/A |
| Transport Information | UN 1759 | Appearance | White powder |
| Safety | 26-39-45-36/37/39-27 | Risk Codes | 41-34 |
| Molecular Structure |
|
Hazard Symbols |
 Xi, C
|
| Synonyms |
Biocalc;Loeschkalk;Kemikal;Calkyl;Calcium Hydroxide, FCC, Low Aluminum Powder;calcium(II) hydroxide;hydralime;Calkyl (TN);Calcium hydroxide (JP14/USP);Limbux;Rhenofit CF;Milk of lime;hydrated lime;slaked lime;Calcium Hidroxide;white lime;Lime Water;Calbit;Super Microstar;Kalziumhydroxid; |
Article Data | 1 |
Calcium hydroxide Synthetic route
| Conditions | Yield |
|---|---|
| In solid matrix Irradiation (UV/VIS); heating of water, Ar (excess) and Ca at 465 - 550°C for 1 or 2 hin steel crucible in Ta furnace and cocondensation on mirrored Cu held at 15 K; photolysis of formed matrices with Xe or Hg lamp for 15 min to 2.5 h; reaction mechanisms described; not isolated; detn. by IR; mixture of HCaOH, HCaOCaH and Ca(OH)2 obtained; |
- 680-31-9
N,N,N,N,N,N-hexamethylphosphoric triamide
- 1305-62-0
calcium dihydroxide
- 2382-96-9
2-sulfanyl-1,3-benzoxazole
- 132438-89-2
2C7H4NOS(1-)*2C6H18N3OP*Ca(2+)*2H2O
| Conditions | Yield |
|---|---|
| In toluene | 90% |
Calcium hydroxide Consensus Reports
Calcium hydroxide (CAS NO.1305-62-0) is reported in EPA TSCA Inventory.
Calcium hydroxide Standards and Recommendations
OSHA PEL: TWA 5 mg/m3
ACGIH TLV: TWA 5 mg/m3
Calcium hydroxide Analytical Methods
For occupational chemical analysis use NIOSH: Calcium, 7020; Elements, 7300.
Calcium hydroxide Specification
Calcium hydroxide, with CAS number of 1305-62-0, can be called agriculturallime; Bell mine; bellmine; biocalc; Ca(OH)2; Calcium hydroxide (Ca(OH)2); calciumhydroxide(Ca(OH)2); calciumhydroxidechemicallime. It is an inorganic compound with the chemical formula Ca(OH)2. It is a colorless crystal or white powder and is obtained when calcium oxide (called lime or quicklime) is mixed, or "slaked" with water.
Preparation of Calcium hydroxide: Calcium hydroxide is produced commercially by treating lime with water: CaO + H2O → Ca(OH)2
In the laboratory it can be prepared by mixing an 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.
Uses of Calcium hydroxide:
1. Calcium hydroxide is used in the separation of sugar from sugar cane in the sugar industry and in the processing of Norwegian lutefisk.It also used for clearing a brine of carbonates of calcium and magnesium in the manufacture of salt for food and pharmacopoeia.
2. In dentistry, it is used as dressing in paste form used for anti-microbial effect during a dental root canal procedure. Calcium hydroxide is known to have a strong anti-microbial effect and is a bone-regeneration stimulant.
3. Calcium hydroxide is used as an acid suppressor in the production of metals. Lime is injected into the waste gas stream to neutralise acids such as fluorides and chlorides prior to being released to atmosphere.
4. In the beauty industry, used in relaxers for permanently straightening very curly hair.
When you are using this chemical, please be cautious about it as the following:
1. In case of contact with eyes, rinse immediately with plenty of water and seek medical advice;
2. Wear eye/face protection;
3. In case of accident or if you feel unwell, seek medical advice immediately (show label where possible);
4. Wear suitable protective clothing, gloves and eye/face protection;
5. Take off immediately all contaminated clothing;
You can still convert the following datas into molecular structure:
(1)InChI=1S/Ca.2H2O/h;2*1H2/q+2;;/p-2;
(2)InChIKey=AXCZMVOFGPJBDE-UHFFFAOYSA-L;
(3)Smiles[Ca](O)O;
The toxicity data is as follows:
| Organism | Test Type | Route | Reported Dose (Normalized Dose) | Effect | Source |
|---|---|---|---|---|---|
| mouse | LD50 | oral | 7300mg/kg (7300mg/kg) | Yakkyoku. Pharmacy. Vol. 32, Pg. 1477, 1981. | |
| rat | LD50 | oral | 7340mg/kg (7340mg/kg) | American Industrial Hygiene Association Journal. Vol. 30, Pg. 470, 1969. |
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