Description
Specifications Table
Product Name – Sodium thiosulfate, 0.1 mol/L ConvoL NORMADOSE® volumetric solution
Quantity/Pack Size – 60 ml
Form – Liquid (aqueous solution)
Grade – Analytical (volumetric standard)
Application – Redox titrations, iodine titrations, chlorine determination
Product Overview
This 0.1 mol/L sodium thiosulfate volumetric solution is a precision-formulated reagent designed for accurate redox titrations in analytical laboratories. The ConvoL NORMADOSE® format ensures consistent concentration with minimal degradation over time, eliminating the need for frequent standardization. The solution is prepared from ultra-pure sodium thiosulfate pentahydrate (Na₂S₂O₃·5H₂O) dissolved in deionized water, with added stabilizers to prevent oxidation and bacterial growth. Its low heavy metal content (<5 ppm) and negligible carbonate interference make it ideal for sensitive applications like iodine titrations and chlorine water analysis. The solution comes in a light-resistant amber bottle with a tamper-evident seal to maintain stability during storage. Each batch undergoes rigorous quality control, including potentiometric verification against primary standards, ensuring compliance with ISO 17025 and pharmacopeial requirements. The ready-to-use format eliminates preparation errors while the NORMADOSE® certification provides documented traceability to SI units through an unbroken calibration chain.
FAQs
1. How long does this sodium thiosulfate solution remain stable after opening?
When stored properly in its original amber bottle at 15-25°C, the solution maintains its certified concentration for at least 6 months after opening, though we recommend periodic verification with potassium dichromate for critical applications.
2. Can this solution be used directly for Karl Fischer titrations?
No, this 0.1M sodium thiosulfate solution is specifically standardized for redox titrations and lacks the anhydrous conditions required for Karl Fischer moisture analysis, which requires specialized reagents.
3. What’s the typical coefficient of variation for this volumetric solution?
The batch-to-batch variability is maintained below 0.05% (CV) through automated gravimetric preparation and in-process potentiometric monitoring during production.
4. Does this solution contain any mercury-based preservatives?
No, our formulation uses modern, mercury-free stabilizers that comply with REACH regulations while maintaining equivalent shelf-life stability.
5. How should I dispose of expired sodium thiosulfate solution?
Neutralize with dilute hydrochloric acid to pH 7-8 before disposal according to local chemical waste regulations, as the solution may contain trace sulfur compounds from potential decomposition.
