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Sodium Thiosulphate (Thio)
Sodium Thiosulphate (Thio) (Product Code: SCL-973/229) is an analytical reagent grade salt used as the reducing titrant in iodometric titrations and in rate-of-reaction experiments in school and college chemistry laboratories. Known on the bench simply as "thio" or "hypo", it comes as a 500 gm pack with its MSDS and is a staple of any volumetric analysis kit in India. It is supplied by Jain Scientific Equipments Pvt Ltd (ScienceLab), Ambala, India.
Specifications
| Parameter | Detail |
|---|---|
| Product | Sodium thiosulphate ("thio", also called hypo) |
| Pack capacity | 500 gm |
| Grade | Analytical reagent |
| Safety documentation | Supplied with MSDS |
| Shelf life | Depends on the chemical, its grade and storage conditions; ask us for the expiry date of the batch you are quoted |
| Product code | SCL-973/229 |
| Supplied by | Jain Scientific Equipments Pvt Ltd (ScienceLab), Ambala, India |
What Is Sodium Thiosulphate Used For?
In iodometric titrations, an oxidising sample such as a copper(II) salt or potassium dichromate is treated with excess potassium iodide, and the iodine set free is titrated with thiosulphate from a burette. Starch is added only when the colour has faded to pale straw, and the end point is the sharp change from blue-black to colourless. Where a standard iodine solution is kept in the lab, thiosulphate is its natural partner for cross-checking strength, which is why it belongs in every titration kit for schools in India.
For reaction kinetics, students mix thiosulphate solution with dilute hydrochloric acid in a flask standing on a paper marked with a cross and time how long the precipitating sulphur takes to hide the mark; repeating the run at different concentrations or temperatures gives clear, plottable results. Thiosulphate itself is of low hazard, but acidified mixtures give off sulphur dioxide, so run the kinetics experiment in a well-ventilated room and rinse flasks promptly to remove the sulphur deposit.
Supplier
ScienceLab is the trading name of Jain Scientific Equipments Private Limited in Ambala, Haryana, India, which supplies Sodium Thiosulphate (Thio) to school laboratories, colleges, testing labs and distributors. Titration reagents such as this one can be quoted together with burettes, flasks and indicators for customers in India and international markets. Read more on the ScienceLab company profile.
Related Chemistry Lab Products
Items that pair with sodium thiosulphate in iodometry and kinetics practicals:
- Starch Powder — for preparing the end-point indicator
- Iodine Solution N/10 — a reference solution to titrate against
- Hydrochloric Acid Dilute — the acid used in the disappearing-cross experiment
- Iodine Flask — a stoppered flask that limits iodine loss during titration
- Burette Stand with Clamp & Bosshead — holds the burette steady for repeat titres
Our Chemistry Lab range lists further volumetric reagents and glassware.
Frequently Asked Questions
What does "Thio" mean in Sodium Thiosulphate (Thio)?
"Thio" is the usual laboratory shorthand for sodium thiosulphate. Older textbooks and photographers call the same salt hypo, so all three names on a requisition list refer to this one analytical reagent, listed here as Sodium Thiosulphate (Thio).
How long do Sodium Thiosulphate solutions stay reliable?
Prepared sodium thiosulphate solutions slowly decompose, partly through bacterial action, so make them with freshly boiled and cooled distilled water, keep them stoppered away from light and re-standardise them before any quantitative work.
When should starch indicator be added in a Sodium Thiosulphate titration?
Add starch near the end point, once the iodine colour has faded to pale straw yellow. Adding it too early in a sodium thiosulphate titration binds iodine tightly into the blue complex, which makes the end point drag.
Is Sodium Thiosulphate hazardous?
Sodium thiosulphate is of low toxicity, but it reacts with acids to form sulphur dioxide and a sulphur precipitate, so the kinetics experiment should run in a ventilated room. Follow the MSDS supplied with each pack for storage, first aid and disposal.
What is the shelf life of Sodium Thiosulphate (Thio)?
No fixed shelf life is stated, because shelf life depends on the chemical, its grade and storage conditions. For Sodium Thiosulphate (Thio), ask us for the expiry date of the batch you are quoted, and keep the solid in a closed container in a cool, dry place.
Who supplies Sodium Thiosulphate (Thio)?
Jain Scientific Equipments Pvt Ltd, which trades as ScienceLab in Ambala, Haryana, India, supplies Sodium Thiosulphate (Thio) in 500 gm packs of analytical reagent grade to schools, colleges, testing laboratories and distributors in India and international markets.
Can Sodium Thiosulphate be shipped outside India?
Yes, sodium thiosulphate is supplied to India and international markets. Send your destination country and the number of 500 gm packs via the contact page, and shipping can be quoted together with the reagent.
Request a Quote
For a quotation on Sodium Thiosulphate (Thio), contact our team or collect it with your other titration supplies in the enquiry cart.
Last updated: 24 September 2026
