Calcium chloride dihydrate
| Formula | CaCl2 , 2H2O |
| Density | 1.82 g/cm3 |
| Molar mass | 147.01 g/mol |
| CAS number | 10035-04-8 |
| HS code | 28272000 |
| EC number | 233-140-8 |
| Storage (temprature) | Without limitation |
| SDS | Available |
| RTECS | EV9810000 |
| R phrase | R 36 |
| S phrase | S 22 -24 |
| Assay | 99.0 – 107.0 | % | |
| Description | Conforms | ||
| Solubility | Conforms | ||
| Identification | Conforms | ||
| pH(5% Water) | 4.5 – 9.2 | ||
| Iron,aluminium & phosphate | Conforms | ||
| Limit of magnesium & alkali salt | ≤ | 1 | % |
| Heavy metals | ≤ | 0.001 | % |
Calcium chloride dihydrate is a white crystalline salt commonly used for de-icing, dust control, and in laboratory and industrial applications as a drying and calcium source.
🏭⚗️ Production
Calcium chloride dihydrate is produced by the neutralization of hydrochloric acid with calcium carbonate or calcium hydroxide, followed by crystallization. Controlled evaporation of the solution yields the dihydrate form.
🔬 Properties
Calcium chloride dihydrate appears as a white, odorless crystalline solid. Its chemical formula is CaCl₂·2H₂O, and it has a molar mass of approximately 147.01 g/mol. It is highly soluble in water, hygroscopic, and has a melting point of around 176°C (with decomposition). It readily absorbs moisture from the air.
🧪 Applications
Calcium chloride dihydrate is used for ice and dust control on roads, as a desiccant in drying tubes, and in concrete acceleration. It also serves as a source of calcium ions in laboratories, wastewater treatment, and in food processing as a firming agent.
⚠️ Safety
Calcium chloride dihydrate may cause skin and eye irritation upon contact and can be harmful if swallowed in large amounts. It is hygroscopic and generates heat when dissolved in water, which may cause burns. Use of gloves and eye protection is recommended during handling. It should be stored in a tightly sealed container in a dry place.
