Description
Specifications Table
Product Name – Sodium thiosulfate, 5-hydrate, crystal BAKER ANALYZED™ ACS reagent
Quantity/Pack Size – 500 g
Form – Crystalline powder
Grade – ACS reagent
Application – Titration, iodine analysis, redox reactions, photography
Product Overview
This sodium thiosulfate pentahydrate from BAKER ANALYZED™ is an ACS-grade reagent designed for high-precision laboratory applications. The crystalline form ensures excellent solubility in water (70 g/100 mL at 20°C) while maintaining stability under standard storage conditions. With a minimum assay of 99.0%, it meets rigorous analytical standards for redox titrations, particularly in iodine-iodide systems where its reducing properties provide accurate endpoint determination. The pentahydrate formulation offers consistent stoichiometry, eliminating variability in molar calculations. Its neutral pH (6.0-8.0 in 5% solution) prevents interference in sensitive assays. The reagent’s low heavy metal content (<5 ppm) and negligible chloride/sulfate impurities make it suitable for trace analysis. Packaged in a 500g resealable container, it combines bulk efficiency with protection against moisture absorption that could alter the hydrate composition. The crystalline structure facilitates precise weighing for volumetric solutions. As an ACS-certified product, it undergoes lot-specific testing for purity and performance, with documentation available upon request.
FAQs
1. What is the exact molecular formula of this sodium thiosulfate product?
The molecular formula is Na₂S₂O₃·5H₂O, representing the pentahydrate form with two sodium cations, two thiosulfate anions, and five water molecules per formula unit.
2. How does the ACS grade differ from technical grade sodium thiosulfate?
ACS grade meets American Chemical Society specifications with ≥99.0% purity, strict limits on heavy metals (≤5 ppm), and controlled impurities like chloride and sulfate, whereas technical grade typically has 98% purity with higher impurity tolerances.
3. Can this product be used for preparing standard solutions without further purification?
Yes, the ACS certification confirms it meets primary standard requirements for direct use in preparing 0.1N or 0.01N solutions without additional purification steps, provided proper handling procedures are followed.
4. What is the recommended storage temperature range for maintaining stability?
Store between 15-25°C in a tightly sealed container. Avoid temperatures above 40°C as the pentahydrate may begin losing water of crystallization, altering the effective concentration.
5. Does this product contain any anti-caking agents or additives?
No, this is a pure crystalline product without added anti-caking agents, flow aids, or other additives that could interfere with analytical applications.
