Sodium Thiosulphate Pentahydrate
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Sodium thiosulfate (Na2S2O3) is an inorganic compound that is commonly used as a photographic fixer, as well as in medical and industrial applications. It is a white crystalline powder that is soluble in water and has a mild odor. In photography, sodium thiosulfate is used to remove unexposed silver halide from photographic prints and negatives, making the image permanent. In medicine, it is used as an antidote for cyanide poisoning, and in industrial applications, it is used as a reducing agent, a dechlorinating agent, and in water treatment processes.
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Sodium Thiosulphate Pentahydrate
In the laboratory, Sodium Thiosulphate Pentahydrate is primarily used for the following purposes:
- Titration Agent: It is commonly used in iodometric titrations to determine the concentration of certain substances, particularly for quantifying iodine and chlorine.
- Chemical Analysis: It serves as a reagent for various analytical procedures, including the analysis of metal ions and the determination of dissolved oxygen in water samples.
- Photographic Processing: It is used as a fixer to dissolve unreacted silver halides from photographic film or paper, ensuring the stability and durability of the developed image.
- Gold Extraction: It acts as a leaching agent in the extraction of gold from ores, providing an environmentally friendly alternative to cyanide.
- Starch Indicator: In combination with starch, it helps to visualize the endpoint in iodometric titrations, turning blue-black in the presence of iodine.
When handling Sodium Thiosulphate Pentahydrate in the laboratory, it is important to follow these safety precautions:
- Personal Protective Equipment (PPE):
- Gloves: Wear appropriate gloves to prevent skin contact.
- Eye Protection: Use safety goggles to protect your eyes from splashes.
- Lab Coat: Wear a lab coat to protect your skin and clothing.
- Ventilation:
- Ensure that the area is well-ventilated to avoid inhalation of any dust or vapors.
- Handling and Storage:
- Avoid contact with skin, eyes, and clothing.
- Store in a cool, dry place away from incompatible substances like strong acids.
- Keep the container tightly closed when not in use.
- Spill and Leak Procedures:
- Clean up spills immediately using appropriate protective equipment.
- Sweep up the material and place it in a suitable container for disposal.
- Avoid generating dust and ensure proper ventilation during cleanup.
- First Aid Measures:
- Inhalation: Move the person to fresh air. If breathing is difficult, seek medical attention.
- Skin Contact: Wash the affected area with plenty of soap and water. Remove contaminated clothing.
- Eye Contact: Rinse thoroughly with water for at least 15 minutes and seek medical attention if irritation persists.
- Ingestion: Do not induce vomiting. Rinse mouth with water and seek medical advice immediately.
- Disposal:
- Dispose of in accordance with local, regional, and national regulations. Avoid releasing it into the environment.
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