Name | Calcium hydroxide |
Synonyms | Slaked lime CARBIDE LIME calcium hydrate Calciumhydroxid8 Calcium Hydroxde dihydroxycalcium Calcium hydroxide calcium dihydroxide CALCIUMHYDROXIDE,TECHNICAL Calcium Hydroxide, Powder, Reagent CALCIUMHYDROXIDE,POWDER,REAGENT,ACS CALCIUMHYDROXIDE,POWDER,USP,EP,BP,JP CALCIUMHYDROXIDE,TECH(HYDRATEDLIM)(BULK |
CAS | 1305-62-0 |
EINECS | 215-137-3 |
InChI | InChI=1/Ca.2H2O/h;2*1H2/q+2;;/p-2/rCaH2O2/c2-1-3/h2-3H |
Molecular Formula | CaH2O2 |
Molar Mass | 74.09 |
Density | 2.24 g/mL at 25 °C (lit.) |
Melting Point | 580 °C |
Boling Point | 2850 °C |
Water Solubility | 1.65 g/L (20 ºC) |
Solubility | 1.7g/l |
Appearance | White powder |
Color | White |
Odor | Odorless |
Exposure Limit | ACGIH: TWA 5 mg/m3OSHA: TWA 15 mg/m3; TWA 5 mg/m3NIOSH: TWA 5 mg/m3 |
Solubility Product Constant(Ksp) | pKsp: 5.26 |
Merck | 14,1673 |
pKa | 12.6[at 20 ℃] |
PH | 11.27(1 mM solution);12.2(10 mM solution);12.46(100 mM solution); |
Storage Condition | Store at +5°C to +30°C. |
Stability | Stable. Incompatible with strong acids. |
Sensitive | Air Sensitive |
MDL | MFCD00010901 |
Physical and Chemical Properties | fine white powder. relative density 2.24 soluble in acid, ammonium salt, glycerol, insoluble in water, insoluble in alcohol. |
Use | Used in the preparation of bleaching powder, hard water softener and tap water Disinfection clarifier and construction industry |
Risk Codes | R41 - Risk of serious damage to eyes R34 - Causes burns R37/38 - Irritating to respiratory system and skin. |
Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S39 - Wear eye / face protection. S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) S36/37/39 - Wear suitable protective clothing, gloves and eye/face protection. S27 - Take off immediately all contaminated clothing. |
UN IDs | 3262 |
WGK Germany | 1 |
RTECS | EW2800000 |
FLUKA BRAND F CODES | 34 |
TSCA | Yes |
HS Code | 2825 90 19 |
Hazard Class | 8 |
Packing Group | III |
Toxicity | LD50 orally in rats: 7.34 g/kg (Smyth) |
white crystalline powder. Tasteless. Usually contains trace amounts of water. d 2. 08~2. 34. Soluble in acid, glycerol, sucrose, ammonium chloride solution, water-soluble, insoluble in ethanol. The pH of the saturated aqueous solution at 25 °c was 12.4. In air, carbon dioxide is readily absorbed into calcium carbonate.
The limestone is calcined into calcium oxide, mixed with water and digested in a certain proportion to obtain calcium hydroxide solution, which is purified and separated to remove impurities and then dehydrated, then, it may be dried at 150 to 300 °c.
Analytical reagents. It is used as an absorbent for acid gases such as carbon dioxide, hard water softener, disinfectant, antacid, buffer, neutralizer, curing agent, etc., and can also be used as an additive for rubber, medicine, and petrochemical products.
rat oral LD50:7340mg/kg. It is a strong alkaline substance with stimulating and corrosive effects. Inhalation of dust, the respiratory tract is strongly irritating, and may cause Pneumonia. Eye contact also has a strong irritation, can cause burns. The maximum allowable concentration is 5mg/m3. Staff should be well protected, if accidentally enter the eyes, should immediately rinse with water. Store in a cool, dry, well-ventilated warehouse.