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Sodium Thiosulphate 250G is a high-purity laboratory-grade chemical reagent supplied by IBEX SCIENCES. Based at their central distribution hub in New Anarkali, Lahore, they supply this 250-gram pack size of crystalline powder to educational institutes, chemical research facilities, and medical diagnostic laboratories throughout Pakistan. This specific packaging configuration offers an optimal volume for controlled volumetric analysis and routine laboratory assays without the risks of long-term environmental degradation.
To confirm current stock availability, get an immediate price estimate, or request a formal material safety data sheet (MSDS), you can reach out directly to their Lahore trading office.
Chemical Profile & Laboratory Applications
Sodium Thiosulphate (Na₂S₂O₃), typically provided as the pentahydrate crystalline form (Na₂S₂O₃⋅5H₂O), serves several critical analytical workflows:
- Iodometric Titrations: It serves as a standard reducing agent for measuring concentrations of oxidizing substances. It reacts quantitatively with elemental iodine (I₂), causing a sharp color shift from deep blue-black to colorless when paired with a starch powder indicator.
- Dechlorinating Agent: Widely utilized in water analysis and microbiology applications to instantly neutralize residual chlorine in municipal or industrial water samples, ensuring chemical neutral baselines for downstream culturing.
- Photographic Fixing & Media Prep: Historically recognized as a photographic “hypo” fixer, it helps dissolve unexposed silver halides. In modern microbiology setups, it functions as a sulfur source within selective agar formulations to detect hydrogen sulfide production.
- Storage Protocols: The pentahydrate crystals are efflorescent in warm, dry air and deliquescent in moist conditions. The container must remain tightly sealed and stored in a cool, well-ventilated chemical cabinet to protect against clumping and degradation.
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