Calcium hydroxide

ChemicalBook > CAS DataBase List > Calcium hydroxide

Chemical properties Uses Solubility in water (g/100ml) Identification test Content analysis Toxicity Usage limits Production method

Product Name: 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
Formula Weight: 74.09
MOL File: 1305-62-0.mol

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Calcium hydroxide Property

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)

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Safety

Hazard Codes: Xi,C
Risk Statements: 41-34-37/38
Safety Statements: 26-39-45-36/37/39-27
OEB: B
OEL: TWA: 5 mg/m3
RIDADR: 3262
WGK Germany: 1
RTECS: EW2800000
F: 34
TSCA: Yes
HS Code: 2825 90 19
HazardClass: 8
PackingGroup: III
Hazardous Substances Data: 1305-62-0(Hazardous Substances Data)
Toxicity: LD50 orally in rats: 7.34 g/kg (Smyth)

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Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Danger

Hazard statements

H315Causes skin irritation

H318Causes serious eye damage

H335May cause respiratory irritation

Precautionary statements

P261Avoid breathing dust/fume/gas/mist/vapours/spray.

P264Wash hands thoroughly after handling.

P264Wash skin thouroughly after handling.

P271Use only outdoors or in a well-ventilated area.

P280Wear protective gloves/protective clothing/eye protection/face protection.

P302+P352IF ON SKIN: wash with plenty of soap and water.

P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

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N-Bromosuccinimide Price

Sigma-Aldrich

Product number: 239232
Product name: Calcium hydroxide
Purity: ACS reagent, ≥95.0%
Packaging: 2.5kg
Price: $220
Updated: 2024/03/01

Sigma-Aldrich

Product number: 1.02119
Product name: Calcium hydroxide
Purity: precipitated (≤ 0.0005% Al) EMPROVE? ESSENTIAL USP,FCC,E 526
Packaging: 0.5kg
Price: $215
Updated: 2024/03/01

Sigma-Aldrich

Product number: 1.02110
Product name: Calcium hydroxide
Purity: EMPROVE? ESSENTIAL, Ph. Eur., BP, JP, USP, FCC, E 526
Packaging: 1KG
Price: $79
Updated: 2024/03/01

Sigma-Aldrich

Product number: 1.02110
Product name: Calcium hydroxide
Purity: EMPROVE? ESSENTIAL Ph Eur,BP,USP,JP,FCC,E 526
Packaging: 25kg
Price: $240
Updated: 2024/03/01

Sigma-Aldrich

Product number: 1.02111
Product name: Calcium hydroxide
Purity: for the preparation of DIN 19266 pH standard buffer solutions
Packaging: 25g
Price: $307
Updated: 2024/03/01

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Calcium hydroxide Chemical Properties,Usage,Production

Chemical properties

Calcium hydroxide is a soft white crystalline, odorless powder with an alkaline, bitter taste.

calcium hydroxide powder

Uses

1. Calcium hydroxide Used for preparing bleaching powders, hard water softeners and the disinfecting and clarifying agents of tap water , as well as in building industry
2. Used for pharmacy. Used as rubber and oil industry additives. Used in lubricants for preventing coking, sludge deposition and anti-corrosion. Used as hard water softeners, disinfectants, antacids and so on.
3. Used as analytical reagents, carbon dioxide absorbents, as well as in organic synthesis
4. Used for making bleaching powder, hard water softener, depilatory, disinfectant, acid stop agent, astringent and various calcium salts.
5. Use for carbon dioxide examination and gas absorption. Used for leather hair removal, insecticide and water treatment.

Solubility in water (g/100ml)

Dissolved grams in 100 ml of water at different temperatures (° C):
0.189 g/0°C; 0.182g/10°C; 0.173 g/20°C; 0.16 g/30°C; 0.141g /40℃
8.6 x 10-2g/80 °C; 7.6 x 10-2g/90 °C

Identification test

Mix the sample with 3 to 4 times amount of water to form a uniform paste. Stand for clarification and the transent supernatant is alkaline for the litmus test.
Mix 1g of the sample with 20 ml of water, and add sufficient acetic acid to form solution. The calcium salt test (IT-10) is positive.

Content analysis

Accurately weigh about 1.5g of sample into a beaker and then gradually add 30ml of dilute hydrochloric acid (TS-117). After the sample is fully dissolved, transfer the mixture into a 500ml volumetric flask. Flush the beaker and transfer the lotion into the volumetric flask too. Then dilute to the mark with water and mix fully. Take 50.0ml of the above solution into an appropriate container and add 50.0ml of water. Add in turn 30ml of 0.05ml/L disodium EDTA, 15ml of sodium hydroxide solution (TS-224) and 300mg hydroxynaphthol blue indicator with a 50ml burette under stirring (preferably with a magnetic stirrer), and then continue titrating to the blue end. Per mL of 0.05 ml/L of EDTA disodium corresponds to 3.705 mg of calcium hydroxide.

Toxicity

ADI no restricting (FAO/WHO, 2001).
LD50 7300 mg/kg (mouse, oral).
Corrosive, weaker than lime.
GRAS (FDA, §182.1205, §184.1205, 2000).
The dust or suspension droplets of calcium hydroxide have a stimulating effect on the mucous membrane, which can cause sneezing and coughing. As alkali, it can also saponify the fat, absorb water from the skin, dissolve protein, as well as stimulate and corrode the organization. Moreover, the inhalation of lime dust may cause pneumonia.
The maximum allowable concentration of calcium hydroxide is 5 mg/m3. Once Inhaling dust, people can inhale water vapor, codeine and Judah auning, or paint mustard cream at the chest; when calcium hydroxide coming into the eyes, people should rinse the eyes as soon as possible with the running water and followed by 5% ammonium chloride solution or 0.01% CaNa2-EDTA solution, and then add 0.5% tetracaine solution dropwise. While working, people should wear dustproof fiber work clothes, gloves and dust-proof glasses to protect the respiratory organs, and paint grease ointment to prevent dust inhalation.

Usage limits

GB 2760-96: processing aids, GMP.
FAO/WHO (1984): butter and whey cream, 2g/kg (only used for adjust Ph value, calculate on anhydrous substance); grape juice and its concentrated juices (physical method for anticorrosion) baby food, edible caseinate, according to GMP.
In Japan, the maximum amount is 1.84% (calcium 1%).

Production method

Lime slaking method: first calcine limestone into calcium oxide, and the selected calcium oxide is slaked with water by the ratio of 1: (3~3.5). Then the generated calcium hydroxide solution is purified and separated to remove slag, and then centrifuged for dehydration. After further dried at 150~300℃, the above products is screened (120 mesh or more) to obtain the finished calcium hydroxide.
CaCO3 → CaO + CO2↑
CaO + H2O → Ca(OH) 2

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, a weak base, has many diverse uses. Among the most important ones are:Flocculants; Paints And Sealants; Mortar; Portland Cement Mortar; Lime Plaster
Other uses that have occurred in industry include:
An alkali used as a lye substitute (NaOH) in no-lye hair relaxers.

A chemical depilatory agent found in Nair .
A calcium supplement in mineral fortified baby formulas.
A chemical reagent used to form a long-lasting fungicide.
In “reef-aquariums” for adding bio-available calcium in solution for calcium-using animals such as algae, snails, tube worms and corals and also to increase the alkalinity of the water.
In the tanning industry for neutralization of acid, the liming of hides and skins and the flocculation of resultant wastewater.
In the oil industry for the manufacture of oil additives (salicatic, sulphatic, fenatic).
In the chemical industry for manufacture of calcium stearate.
In the food industry for processing water (for alcoholic and soft drinks).
Used in the separation of sugar from sugar cane in the sugar industry.
Used in the processing of Norwegian “Lutefisk”. Dried cod fish is soaked in a mixture of slaked lime and soda to produce a soft-fleshed fish fillet that is steamed or baked and served with potato “Lefse”.
In the manufacture of brake ? pads, ebonite and pesticides.
In dentistry, it is used as dressing in paste form used for antimicrobial effect during a dental root canal procedure. Calcium hydroxide is known to have a strong antimicrobial effect and is a boneregeneration stimulant.
In the production of metals, lime is injected into the waste gas stream to neutralize acids, such as fluorides and chlorides prior to being released to atmosphere.

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.

Uses

Calcium Hydroxide is a general food additive made by adding water to calcium oxide (lime). it has poor water solubility with a solubility of 0.185 g in 100 g of water at 0°c. the ph of a water solution at 25°c is approximately 12.4. it is used to promote dispersion of ingre- dients in sauces, creamed spinach, and a frozen pea/potato dish. it is used at 0.1% to stabilize the potassium iodide of iodized salt, and it is used as a neutralizer for soured cream prior to buttermaking. it is also termed hydrated lime, calcium hydrate, and slaked lime.

Production Methods

Calcium hydroxide is manufactured by adding water to calcium oxide, a process called slaking.

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).

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.

Flammability and Explosibility

Not classified

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

First aid

If this chemical gets into the eyes, remove anycontact lenses at once and irrigate immediately for at least30 min, occasionally lifting upper and lower lids. Seekmedical attention immediately. If this chemical contacts theskin, remove contaminated clothing and wash immediatelywith soap and water. Seek medical attention immediately. Ifthis chemical has been inhaled, remove from exposure,begin rescue breathing (using universal precautions, including resuscitation mask) if breathing has stopped and CPR ifheart action has stopped. Transfer promptly to a medicalfacility. When this chemical has been swallowed, getmedical attention. Give large quantities of water and inducevomiting. Do not make an unconscious person vomit.Medical observation is recommended for 24-48 h afterbreathing overexposure, as pulmonary edema may bedelayed. As first aid for pulmonary edema, a doctor orauthorized paramedic may consider administering acorticosteroid spray.

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

CALCIUM CARBONATE Calcium oxide METALLURGICAL COKE

Preparation Products

Calcium-based grease CALCIUM5INOSINATE 4-Hydroxybenzamidine hydrochloride CALCIUM IODIDE HYDRATE CALCIUM BROMATE Calcium formate Calcium Alginate Calcium thiocyanate CALCIUM GLUTAMATE Calcium Stearyl-2-Lactylate Calcium hypophosphite 4-Bromopyrimidine CALCIUM5'-GUANYLATE 2-CHLORO-6-HYDROXYBENZALDEHYDE Calcium bromide MOLECULAR SIEVES Vicnna lime 1,2:3,4-Di-O-isopropylidene-D-galactopyranose Calcium nitrate CALCIUM GLYCEROPHOSPHATE Sodium hypophosphite 4-Pyrimidinol Calcium peroxide Calcium tungstate Calcium Propionate Calcium 5'-ribonucleotide STEVIA HEXAMETHONIUM BROMIDE Calcium 2-ethylhexanoate Calcium nitrite Calcium iodate Calcium bisulfite Lamepon A Calcium bis(2-hydroxy-4-(methylthio)butyrate) SODIUM HYPOPHOSPHITE MONOHYDRATE CARBOXYMETHYLCELLULOSE CALCIUM Calcium bis(cyclohexylsulphamate) Tetrachloropropene CALCIUM SACCHARIN Phosphoric acid, calcium salt (1:)

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Shanghai QianYan Bio-technology Co., Ltd

Tel: 02781293128
Email: orders@biochemsafebuy.com
Country: China
ProdList: 9923
Advantage: 55

Shandong Xiya Chemical Co., Ltd.

Tel: 4009903999 13395398332
Fax: 0539-6365991
Email: sales@xiyashiji.com
Country: China
ProdList: 20806
Advantage: 60

Grader reagent

Tel: 18221735425
Email: sales@xinpingchem.com
Country: China
ProdList: 9942
Advantage: 58

Beijing Solarbio Science & Tecnology Co., Ltd.

Tel: 010-50973130 4009686088
Email: 3193328036@qq.com
Country: China
ProdList: 29785
Advantage: 68

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View Lastest Price from Calcium hydroxide manufacturers

Hebei Weibang Biotechnology Co., Ltd

Product: Calcium hydroxide 1305-62-0
Price: US $10.00/KG
Min. Order: 100KG
Purity: 99%
Supply Ability: 100 mt
Release date: 2024-11-21

Shaanxi Dideu Medichem Co. Ltd

Product: Calcium hydroxide 1305-62-0
Price: US $0.10/KG
Min. Order: 1KG
Purity: 99.0%
Supply Ability: 1000Tons
Release date: 2024-08-21

Shaanxi Dideu Medichem Co. Ltd

Product: Calcium hydroxide 1305-62-0
Price: US $0.00-0.00/KG
Min. Order: 1KG
Purity: 99.0%
Supply Ability: 10000KG
Release date: 2024-08-16

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