Benzenesulfonic acid monohydrate
Benzenesulfonic acid monohydrate (CAS: 26158-00-9), formula C₆H₅SO₃H · H₂O, is a strong organic acid supplied by Tech Serve Solutions with a molecular weight of 176.19. This crystalline solid serves as a versatile intermediate in various chemical syntheses. It is commonly employed in the production of dyes, detergents, and pharmaceuticals, acting as a catalyst or reactant. TSS provides this compound with an assay of 97% for research and industrial applications.

Dye Synthesis
Benzenesulfonic acid monohydrate is a key intermediate in the synthesis of various azo dyes and other colourants. Its sulfonic acid group can be readily functionalised or used to impart water solubility to dye molecules.
Detergent Production
This compound finds application in the production of surfactants and detergents. The hydrophobic benzene ring combined with the hydrophilic sulfonic acid group forms the basis of many effective cleaning agents.
Pharmaceutical Intermediates
It serves as a building block in the synthesis of specific pharmaceutical compounds. The sulfonic acid moiety can be incorporated into drug structures or used in derivatisation processes.
Catalysis
As a strong organic acid, benzenesulfonic acid monohydrate can function as an acid catalyst in various organic reactions, such as esterifications and alkylations.
| Molecular weight | 176.19 |
|---|---|
| Linear formula | C6H5SO3H · H2O |
| Assay | 97% |
| Melting point | 42-49 °C(lit.) |


Hazard statements
- H302Harmful if swallowed
- H314Causes severe skin burns and eye damage
Precautionary statements
- P280Wear protective gloves, clothing and eye/face protection
- P305IF IN EYES
- P310Immediately call a POISON CENTER or doctor
| Protective equipment | Eyeshields, Faceshields, full-face particle respirator type N100 (US), Gloves, respirator cartridge type N100 (US), type P1 (EN143) respirator filter, type P3 (EN 143) respirator cartridges |
|---|---|
| Transport (UN / ADR) | UN 2585 8/PG 3 |
| Water hazard class (WGK, DE) | 1 |
| Hazard codes (EU) | C |
| Risk statements (R) | 20/21/22-34 |
| Safety statements (S) | 26-27-36/37/39-45 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is Benzenesulfonic acid monohydrate used for?
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Benzenesulfonic acid monohydrate is used in chemical synthesis, particularly in the production of dyes, detergents, and pharmaceutical intermediates. It can also serve as an acid catalyst.
What are the CAS number and formula for Benzenesulfonic acid monohydrate?
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The CAS number is 26158-00-9 and the formula is C₆H₅SO₃H · H₂O.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies Benzenesulfonic acid monohydrate with an assay of 97%. This is a technical grade and not represented as USP/BP/EP.
How should Benzenesulfonic acid monohydrate be handled safely?
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This compound is corrosive and harmful if swallowed, inhaled, or in contact with skin. Handle with appropriate personal protective equipment, including eye protection, gloves, and respiratory protection. Ensure adequate ventilation.
Is Benzenesulfonic acid monohydrate shipped internationally?
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Yes, Tech Serve Solutions is a specialist global supplier and exporter of fine chemicals, and can handle international shipping for Benzenesulfonic acid monohydrate.
How can I request a quote or sample?
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Please contact our sales team via the website or direct email to request a quote or sample for Benzenesulfonic acid monohydrate.
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