Iodometry
Titrating liberated iodine in dissolved-oxygen, chlorine and copper determinations.
Crystals
Laboratory Reagents · Extra Pure
Sodium Thiosulphate
Also known as Hypo, Sodium thiosulfate and Sodium hyposulphite
CAS7772-98-7
FormulaNa₂S₂O₃
MW158.11
PubChem24477
Sodium thiosulphate, minimum 98%, the standard titrant for iodometry.
Assay≥ 98%
GradeExtra Pure
MW158.11
ISO 9001:2015 certified supplier
Overview
About Sodium Thiosulphate
Sodium Thiosulphate is a white crystalline salt that is very soluble in water.
It is the standard titrant in iodometric analysis, a photographic fixer and a dechlorinating agent for water.
IdentityNa₂S₂O₃
- CAS number
- 7772-98-7
- Molecular formula
- Na₂S₂O₃
- Molecular weight
- 158.11
- PubChem CID
- 24477
- Appearance
- White crystals
- Grade
- Extra Pure
Technical specification
Specification, Extra Pure grade
Every batch is released against these limits. Ask for the specification sheet with your quote.
| # | Test | Specification |
|---|---|---|
| 01 | Appearance (colour) | White |
| 02 | Appearance (form) | Crystalline |
| 03 | pH (5% solution) | 6 to 8.5 |
| 04 | Calcium (Ca) | Not more than 0.01% |
| 05 | Heavy metals (as Pb) | Not more than 0.001% |
| 06 | Insoluble matter | Not more than 0.001% |
| 07 | Sulphide (S) | Not more than 0.0001% |
| 08 | Assay | Not less than 98% |
Need a tighter limit or an extra test? Send us your specification with your enquiry.
Specification sheet (PDF)
Applications
Where Sodium Thiosulphate is used
Photography
Fixing silver-halide photographs.
Dechlorination
Removing chlorine from water for aquaria, hatcheries and laboratories.
Packing
Sealed, labelled and ready to ship
Every container carries the product name, batch number, dates and hazard labels. Other pack sizes are available on request.
250 gSealed bottle
500 gSealed bottle
1 kgSealed bottle
Storage & handling
Store cool, dry and closed
- Keep in the original, tightly closed container in a cool, dry, well-ventilated place.
- Protect from moisture, heat and direct sunlight, and keep away from incompatible materials.
- Wear gloves and eye protection when handling and avoid raising dust.
Read the MSDS for full hazard, first-aid and disposal information.
Documents
Specification and safety documents
Ask for any of these and we will email them with your quote.
Questions
Frequently asked
Which pack sizes can I order?
250 g, 500 g and 1 kg packs as standard. Tell us if you need a different size or a repeat schedule.
Can you supply against our own specification?
Send your specification with your enquiry. Our team will confirm which limits we can meet before you order.
Do you ship outside India?
Yes. We hold an Import Export Code and supply both domestic and export buyers. Mention the destination country in your enquiry so we can quote the right packing and documents.
Enquire
Get a quote for Sodium Thiosulphate
Tell us the quantity, pack size and destination. We will confirm price, availability and lead time, and send the documents you need.
Phone & WhatsApp+91 77530 58907
Emailankur.agrawal@spacorporation.in