Description
Specifications Table
Product Name – Sodium thiosulfate, pentahydrate LR
Quantity/Pack Size – 500 g
Form – Crystalline powder
Grade – LR (Laboratory Reagent)
Application – Redox titrations, iodine titration, analytical chemistry
Product Overview
Sodium thiosulfate pentahydrate LR is a highly soluble, crystalline compound widely used in laboratory settings for its reliable reducing properties. This laboratory reagent-grade chemical ensures consistent performance in redox titrations, particularly in iodine-based reactions, where it acts as a titrant to determine oxidizing agent concentrations. Its stable pentahydrate form guarantees accurate stoichiometric calculations, making it indispensable for analytical chemistry applications. The compound’s high purity minimizes interference in sensitive assays, while its excellent water solubility allows for easy preparation of standard solutions. Whether used in volumetric analysis or as a dechlorinating agent, this LR-grade sodium thiosulfate delivers precision and reproducibility. Store in a cool, dry place to maintain its efficacy, and handle with standard lab safety protocols to ensure long-term stability.
FAQs
1. What is the shelf life of sodium thiosulfate pentahydrate LR?
When stored in a tightly sealed container away from moisture and direct sunlight, sodium thiosulfate pentahydrate LR retains its stability for up to 2–3 years. Over time, exposure to air may lead to efflorescence, but the chemical remains usable if dissolved properly.
2. Can this be used as a substitute for anhydrous sodium thiosulfate?
While both forms serve similar purposes, the pentahydrate variant contains water molecules, which must be accounted for in molar calculations. For applications requiring anhydrous conditions, adjustments to the quantity are necessary to achieve equivalent results.
3. How should I prepare a standard solution for titration?
Dissolve the required mass of sodium thiosulfate pentahydrate in freshly boiled and cooled distilled water to prevent bacterial growth. Standardize the solution against a primary standard like potassium dichromate for accurate concentration determination.
4. Is this compatible with acidic solutions?
Sodium thiosulfate decomposes in strongly acidic conditions, releasing sulfur dioxide and sulfur. For stable reactions, maintain a neutral to slightly alkaline pH, especially during titrations involving iodine or other oxidizing agents.
5. What precautions should I take while handling this chemical?
Wear protective gloves and goggles to avoid skin or eye irritation. Though non-toxic in typical lab quantities, ingestion or inhalation of dust should be avoided. Work in a well-ventilated area and follow standard lab disposal guidelines for any spills.
