Introduction to Sodium Silicate Hydrate
Sodium silicate, commonly known as waterglass, is a compound with a wide range of industrial and commercial applications. Its chemical formula, Na2SiO3·9H2O, indicates that it is a hydrated form of sodium silicate, containing nine molecules of water for each molecule of sodium silicate.
Physical and Chemical Properties
Sodium silicate hydrate appears as a white, odorless, crystalline powder. It is soluble in water, forming a viscous solution that is alkaline in nature. The compound has a melting point of about 72.2°C and decomposes at higher temperatures, releasing water vapor.
Key Specifications
- Molecular Weight: The molecular weight of Na2SiO3·9H2O is approximately 284.20 g/mol.
- Solubility: Highly soluble in water, forming a thick, syrup-like solution.
- pH Level: The pH of a water solution is typically in the range of 11-12.5, indicating strong alkalinity.
Applications in Various Industries
Sodium silicate hydrate finds applications in numerous industries due to its unique properties.
In Detergents and Soaps
- Function: Acts as a builder to enhance the cleaning effectiveness of detergents.
- Benefits: Offers cost-effectiveness and environmental friendliness compared to phosphates.
In Cement and Concrete
- Usage: Used as a binding agent in cement and concrete mixtures.
- Advantages: Enhances durability and resistance to environmental factors.
In Paper Manufacturing
- Role: Serves as an adhesive and buffering agent in paper production.
- Effectiveness: Improves the strength and quality of paper products.
Advantages and Limitations
Advantages
- Eco-Friendly: Non-toxic and biodegradable, making it a green alternative in many applications.
- Versatility: Its wide range of applications showcases its versatility.
Limitations
- Corrosiveness: Alkaline nature can be corrosive to metals and harmful to skin on prolonged exposure.
- Storage Requirements: Needs to be stored in a cool, dry place to prevent caking and degradation.
Conclusion
Sodium silicate hydrate (Na2SiO3·9H2O) is a versatile compound with significant utility in various industrial sectors. Its unique properties, such as solubility in water and alkalinity, contribute to its widespread use, despite certain limitations. For detailed information about this compound, you can refer to this source.
Further Considerations
In future research or industrial applications, focusing on improving the compound's compatibility with various materials and reducing its corrosive nature could expand its utility even further.