Description
Specifications Table
Product Name – Sodium thiosulfate, 5H2O AnalaR NORMAPUR® ACS
Quantity/Pack Size – 500 g
Form – Crystalline powder
Grade – ACS Reagent
Application – Titration, iodine analysis, dechlorination, photography
Product Overview
Sodium thiosulfate pentahydrate (Na₂S₂O₃·5H₂O) AnalaR NORMAPUR® ACS is a high-purity, laboratory-grade chemical designed for demanding analytical and research applications. This crystalline powder meets the stringent American Chemical Society (ACS) specifications, ensuring exceptional consistency, minimal impurities, and reliable performance in critical procedures. Its stable composition makes it particularly suitable for redox titrations, where precise stoichiometric reactions are essential for accurate iodine or chlorine quantification. The pentahydrate form offers enhanced solubility in water, facilitating quick dissolution and homogeneous solutions for volumetric analysis. Beyond analytical chemistry, its reducing properties are leveraged in photographic development to neutralize excess silver halides, preventing image degradation. The AnalaR NORMAPUR® certification guarantees traceability and adherence to international quality standards, while the tightly controlled manufacturing process minimizes heavy metal contaminants and particulate matter. Store in a cool, dry environment to preserve its efficacy, as exposure to air or moisture may lead to gradual decomposition. This reagent is compatible with standard glassware and most aqueous systems, though incompatibilities with strong acids or oxidizing agents should be noted. For researchers requiring reproducible results in quantitative analysis, this ACS-grade sodium thiosulfate delivers the purity and performance needed for confidence in experimental outcomes.
FAQs
1. What is the shelf life of sodium thiosulfate pentahydrate when stored properly?
When stored in a tightly sealed container away from moisture and direct sunlight, sodium thiosulfate pentahydrate retains its stability for up to 2–3 years. Over time, exposure to air may cause slight efflorescence or decomposition, so resealing the pack after each use is recommended.
2. Can this ACS-grade sodium thiosulfate be used for iodine titration in food analysis?
Yes, this reagent is highly suitable for iodine titration in food analysis due to its ACS-grade purity, which ensures minimal interference from impurities. It provides sharp endpoint detection when paired with starch indicators, making it ideal for determining vitamin C or oxidizing agent concentrations.
3. Is this product compatible with plastic labware, or should only glass be used?
While sodium thiosulfate solutions are generally compatible with most plastic labware like PP or HDPE, prolonged storage in plastic may risk leaching or adsorption. For long-term storage or critical applications, borosilicate glass is preferred to maintain solution integrity and avoid potential contamination.
4. How does the AnalaR NORMAPUR® certification differ from standard reagent grades?
The AnalaR NORMAPUR® certification indicates a higher purity level than general reagent grades, with stricter controls on trace impurities, heavy metals, and insolubles. This grade is validated for compliance with ACS specifications, ensuring consistency in analytical and research applications where precision is paramount.
5. What precautions should be taken when handling sodium thiosulfate in powder form?
Always wear gloves, safety goggles, and a lab coat when handling the powder to avoid skin or eye irritation. Work in a well-ventilated area or fume hood, as inhalation of fine particles may cause respiratory discomfort. In case of spillage, sweep up the powder carefully and avoid generating dust.
