Calcium hydroxide
- CAS No.
- 1305-62-0
- Chemical Name:
- Calcium hydroxide
- Synonyms
- Ca(OH)2;HYDRATED LIME;SLAKED LIME;LIME WATER;carboxide;CARBIDE LIME;CALCIUM HYDRATE;Calciumhydroxid8;Calcium Hydroxide Topical Solution;calvit
- CBNumber:
- CB9853016
- Molecular Formula:
- CaH2O2
- Molecular Weight:
- 74.09
- MOL File:
- 1305-62-0.mol
- MSDS File:
- SDS
- Modify Date:
- 2024/8/17 21:30:02
| Melting point | 580 °C |
|---|---|
| Boiling point | 2850 °C |
| Density | 2.24 g/mL at 25 °C (lit.) |
| storage temp. | Store at +5°C to +30°C. |
| solubility | 1.7g/l |
| form | Solid |
| pka | 12.6[at 20 ℃] |
| color | White |
| Odor | Odorless |
| PH Range | 12.4 |
| PH | 11.27(1 mM solution);12.2(10 mM solution);12.46(100 mM solution); |
| Water Solubility | 1.65 g/L (20 ºC) |
| Sensitive | Air Sensitive |
| Merck | 14,1673 |
| Solubility Product Constant (Ksp) | pKsp: 5.26 |
| Exposure limits |
ACGIH: TWA 5 mg/m3 OSHA: TWA 15 mg/m3; TWA 5 mg/m3 NIOSH: TWA 5 mg/m3 |
| Stability | Stable. Incompatible with strong acids. |
| CAS DataBase Reference | 1305-62-0(CAS DataBase Reference) |
| NIST Chemistry Reference | Calcium dihydroxide(1305-62-0) |
| EPA Substance Registry System | Calcium hydroxide (1305-62-0) |
SAFETY
Risk and Safety Statements
| Symbol(GHS) |   GHS05,GHS07 |
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Signal word | Danger | |||||||||
| Hazard statements | H315-H318-H335 | |||||||||
| Precautionary statements | P261-P264-P271-P280-P302+P352-P305+P351+P338 | |||||||||
| Hazard Codes | Xi,C | |||||||||
| Risk Statements | 41-34-37/38 | |||||||||
| Safety Statements | 26-39-45-36/37/39-27 | |||||||||
| RIDADR | 3262 | |||||||||
| OEB | B | |||||||||
| OEL | TWA: 5 mg/m3 | |||||||||
| WGK Germany | 1 | |||||||||
| RTECS | EW2800000 | |||||||||
| F | 34 | |||||||||
| TSCA | Yes | |||||||||
| HS Code | 2825 90 19 | |||||||||
| HazardClass | 8 | |||||||||
| PackingGroup | III | |||||||||
| Toxicity | LD50 orally in rats: 7.34 g/kg (Smyth) | |||||||||
| NFPA 704 |
|
Calcium hydroxide price More Price(37)
| Manufacturer | Product number | Product description | CAS number | Packaging | Price | Updated | Buy |
|---|---|---|---|---|---|---|---|
| Sigma-Aldrich(India) | 450146 | Calcium hydroxide 99.995% trace metals basis | 1305-62-0 | 5G | ₹7815.65 | 2022-06-14 | Buy |
| Sigma-Aldrich(India) | 450146 | Calcium hydroxide 99.995% trace metals basis | 1305-62-0 | 25G | ₹19604.08 | 2022-06-14 | Buy |
| Sigma-Aldrich | 31219 | Calcium hydroxide puriss. p.a., reag. Ph. Eur., ≥96% | 1305-62-0 | 100G | ₹3712.98 | 2022-06-14 | Buy |
| Sigma-Aldrich(India) | 31219 | Calcium hydroxide puriss. p.a., reag. Ph. Eur., ≥96% | 1305-62-0 | 100G | ₹3712.98 | 2022-06-14 | Buy |
| Sigma-Aldrich | 31219 | Calcium hydroxide puriss. p.a., reag. Ph. Eur., ≥96% | 1305-62-0 | 500G | ₹10792.53 | 2022-06-14 | Buy |
Calcium hydroxide Chemical Properties,Uses,Production
Description
Calcium Hydroxide is a colorless crystal or white powder, obtained when CaO (called lime or quicklime) is mixed, or “slaked” with water. It can also be precipitated by mixing CaCl2 andNaOH.The nameof the natural,mineral formis “portlandite”. It is a relatively rare mineral, known from some volcanic, plutonic, and metamorphic rocks. It has also been known to be formed in burning coal dumps.
Chemical Properties
Calcium hydroxide occurs as a white or almost white, crystalline or granular powder. It has a bitter, alkaline taste. Calcium hydroxide readily absorbs carbon dioxide to form calcium carbonate.
Physical properties
Soft white crystalline powder; hexagonal; density 2.34 g/cm3; slightly bitter taste; loses water when heated at elevated temperatures (580°C); slightly soluble in water; Ksp 1.2x10-14; aqueous solution alkaline; soluble in glycerol and acids; insoluble in alcohol.
Uses
calcium hydroxide is an inorganic base used to adjust the pH of a product, it can also serve as a topical astringent and alkali in solutions or lotions. It can burn the skin and eyes.
Definition
Lime water: A solution of calcium hydroxide in water. If carbon dioxide is bubbled through lime water a milky precipitate of calcium carbonate forms. Prolonged bubbling of carbon dioxide turns the solution clear again as a result of the formation of soluble calcium hydrogencarbonate (Ca(HCO3)2).
Production Methods
Calcium hydroxide is manufactured by adding water to calcium oxide, a process called slaking.
General Description
Odorless white granules. Sinks in water.
Air & Water Reactions
Water soluble. The amount of heat generated by hydrolysis may be large.
Reactivity Profile
The nitroparaffins, nitromethane, nitropropane, etc. form salts with inorganic bases such as Calcium hydroxide . The dry salts are explosive [Chem. Eng. news 30:2344 1952]. Bases are chemically similar to sodium hydroxide (NaOH) or sodium oxide (Na2O). They neutralize acids exothermically to form salts plus water. When soluble in water they give solutions having a pH greater than 7.0. Mixing these materials with water can generate troublesome amounts of heat as the base is dissolved or diluted. Bases react with certain metals (such as aluminum and zinc) to form oxides or hydroxides of the metal and generate gaseous hydrogen. Bases may initiate polymerization reactions in polymerizable organic compounds, especially epoxides). They may generate flammable and/or toxic gases with ammonium salts, nitrides, halogenated organics, various metals, peroxides, and hydroperoxides. Materials of this group often serve as catalysts. A strong base. Forms caustic solution in water [Merck 11th ed. 1989].
Hazard
Skin, eye, and upper respiratory tract irri- tant, avoid inhalation.
Health Hazard
Dust irritates eyes, nose and throat.
Agricultural Uses
Calcium hydroxide, [Ca(OH)2], also called slaked lime
or hydrated lime, is a white solid that dissolves
sparingly in water. It is manufactured by adding water to
calcium oxide, a process that emits heat and is known as
slaking.
Calcium hydroxide is a cheap alkali, used for
neutralizing the acidity of acid soils and in the
manufacture of mortar, white wash, bleaching powder
and glass. It is an excellent absorbent for carbon dioxide
to produce insoluble calcium carbonate and has a
neutralizing value of 179%, compared to 100% of pure
calcium carbonate.
Pharmaceutical Applications
Calcium hydroxide is a strong alkali and is used as a pharmaceutical
pH adjuster/buffer and antacid in topical medicinal ointments,
creams, lotions, and suspensions, often as an aqueous solution (lime
water). It forms calcium soaps of fatty acids, which produce
water-in-oil emulsions (calamine liniment), and it is also used as a
topical astringent.
Calcium hydroxide is a common cosmetic ingredient in hairstraightening
and hair-removal products, and in shaving preparations.
1) In dentistry, it is used as a filling agent and in dental pastes
to encourage deposition of secondary dentine. Calcium hydroxide
was traditionally used as an escharotic in Vienna Paste.
Safety Profile
Mildly toxic by ingestion. A severe eye irritant. A skin, mucous membrane, and respiratory system irritant. Mutation data reported. Causes dermatitis. Dust is considered to be a significant industrial hazard. A common air contaminant. Violent reaction with maleic anhydride, nitroethane, nitromethane, nitroparaffins, nitropropane, phosphorus. Reaction with polychloiinated phenols + potassium nitrate forms extremely toxic products. See also CALCIUM COMPOUNDS
Safety
Calcium hydroxide is used in oral and topical pharmaceutical
formulations. It is mildly toxic by ingestion. In the pure state,
calcium hydroxide is a severe skin, eye, and respiratory irritant, and
it is corrosive, causing burns. Typical exposure limits are TVL
5 mg/m3 in air.
LD50 (mouse, oral): 7.3 g/kg
LD50 (rat, oral): 7.34 g/kg
Potential Exposure
Calcium hydroxide is used in agriculture and in fertilizer manufacture; it is used in the formulation of mortar, plasters, and cements; it is used as a scrubbing and neutralizing agent in the chemical industry. For making insecticides, acaricides, and products to control arthropods
storage
Calcium hydroxide should be stored in an airtight container, in a cool, dry, well-ventilated place. Calcium hydroxide powder may be sterilized by heating for 1 hour at a temperature of at least 1608℃.
Shipping
UN3262 Corrosive solid, basic, inorganic, n.o.s., Hazard class: 8; Labels: 8-Corrosive material, Technical Name required
Purification Methods
Heat analytical grade calcium carbonate at 1000o during 1hour. Allow the resulting oxide to cool and add slowly to water. Heat the suspension to boiling, cool and filter through a sintered glass funnel of medium porosity (to remove soluble alkaline impurities). Dry the solid at 110o and crush it to a uniformly fine powder. [Ehrlich in Handbook of Preparative Inorganic Chemistry (Ed. Brauer) Academic Press Vol I p 934 1963.]
Incompatibilities
Incompatible with strong acids, maleic anhydride, phosphorus, nitroethane, nitromethane, nitroparaffins, and nitropropane. Calcium hydroxide can be corrosive to some metals.
Waste Disposal
Landfill or admixture with acid industrial wastes prior to lagooning
Regulatory Status
GRAS listed. Accepted for use as a food additive in Europe. Included in the FDA Inactive Ingredients Database (intravenous and subcutaneous injections; oral suspensions and tablets; topical emulsions and creams). Included in parenteral preparations licensed in the UK.
Calcium hydroxide Preparation Products And Raw materials
Raw materials
Preparation Products
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