0.1 Molar Sodium Thiosulphate: Properties, Preparation, and Applications
Introduction
Sodium thiosulphate, also known as sodium hyposulphite, is a chemical compound with the formula Na2S2O3. It is a colorless, crystalline solid with a sweet, salty taste. Sodium thiosulphate is widely used in various industries, including photography, medicine, and water treatment. In this article, we will focus on 0.1 molar sodium thiosulphate, its properties, preparation, and applications.
Properties of 0.1 Molar Sodium Thiosulphate
Physical Properties
- Appearance: Colorless, crystalline solid
- Molecular Weight: 158.11 g/mol
- Solubility: Highly soluble in water, slightly soluble in ethanol
- Density: 1.667 g/cm³
Chemical Properties
- pH: 6.5-7.5 (1% solution)
- Reducing Agent: Sodium thiosulphate is a strong reducing agent, capable of reducing iodine and other oxidizing agents.
- Stability: Stable under normal storage conditions, but may decompose when exposed to air, light, or heat.
Preparation of 0.1 Molar Sodium Thiosulphate
To prepare 0.1 molar sodium thiosulphate, follow these steps:
Materials
- Sodium thiosulphate pentahydrate (Na2S2O3·5H2O)
- Distilled water
Procedure
- Weigh 15.8 grams of sodium thiosulphate pentahydrate into a 1-liter volumetric flask.
- Add approximately 800 mL of distilled water to the flask.
- Stir until the solid is completely dissolved.
- Add more distilled water to the flask to reach a final volume of 1 liter.
- Mix well and transfer the solution to a clean container.
Applications of 0.1 Molar Sodium Thiosulphate
Photography
- Sodium thiosulphate is used as a fixer in photographic processing to remove unexposed silver halides from film and paper.
Medicine
- It is used as an antidote for cyanide poisoning, as it can react with cyanide to form a harmless compound.
Water Treatment
- Sodium thiosulphate is used to remove chlorine from water, making it safe for use in aquariums and swimming pools.
Conclusion
In conclusion, 0.1 molar sodium thiosulphate is a versatile chemical compound with a wide range of applications. Its unique properties make it an essential component in various industries, including photography, medicine, and water treatment. By following the preparation procedure outlined above, you can easily prepare 0.1 molar sodium thiosulphate for your specific needs.
