Calcium Hydroxide CAS#1305-62-0
High Solubility: Calcium hydroxide is slightly soluble in water, and its solubility decreases with the increase of temperature. It can be dissolved in glycerol and acid, but insoluble in ethanol, which supports its application in water treatment and chemical preparation.
Stable Alkalinity: The saturated aqueous solution of calcium hydroxide shows strong alkalinity with pH value around 12.4. It will react with carbon dioxide in the air to form calcium carbonate, so it needs to be sealed to maintain its performance.
Versatile Uses: It is widely used for flue gas desulfurization, wastewater pH adjustment, soil improvement and building materials production.
Crystalline Form & Hygroscopic Nature: This material is supplied as a white powdery solid with hygroscopic property and is easy to absorb carbon dioxide from air, which requires sealed storage and careful operation.
Calcium Hydroxide, characterized by the molecular formula Ca(OH)₂, presents as a white powdery solid with hygroscopic properties. It is slightly soluble in water (1.73 g/L at 20°C), soluble in glycerol and acid, while insoluble in ethanol. Its saturated aqueous solution has a pH of 12.4, and it will gradually carbonize when exposed to air. The substance is corrosive to eyes, skin and respiratory tract, and is used for acid neutralization, flue gas desulfurization, soil acid amelioration and calcium salt manufacturing.
Calcium Hydroxide Chemical Properties
| Item | Specification |
|---|---|
| Melting point | 580 °C (loss of water) |
| Density | 2.24 g/cm³ |
| Refractive index | 1.574 |
| Storage temp | Store below +30°C |
| Solubility | Slightly soluble in water; soluble in glycerol and acid; insoluble in ethanol |
| Form | Powder |
| Color | White |
| Odor | Odorless |
| PH | 12.4 (saturated aqueous solution, 20℃) |
| Water Solubility | 1.73 g/L (20 º C) |
| Sensitive | Hygroscopic, sensitive to carbon dioxide in air |
| Stability | Stable under sealed condition; carbonizes on exposure to air |
Calcium Hydroxide Safety Information
| Item | Specification |
|---|---|
| Hazard Codes | Xi |
| Risk Statements | 36/38 |
| Safety Statements | 26-39 |
| WGK Germany | 1 |
| HS Code | 25220000 |
| Packing | 25kg woven bag / jumbo bag |
This compound is employed as a neutralizing agent for acidic wastewater and flue gas desulfurization, a raw material for the production of calcium salts and building mortar. It also functions in agriculture to neutralize acidic soil, serves as a filler for rubber and coatings, and is utilized as a food processing additive under food grade standard. Additionally, it finds application in leather tanning, sewage sludge treatment and construction plaster production.
