Molekula
p-Toluenesulfonic acid monohydrate
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 2000 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
p-Toluenesulfonic acid monohydrate is a strong organic acid widely used as a catalyst in organic synthesis, a pH adjuster in pharmaceutical formulations, and a reagent in polymer manufacturing. Under the name toluene sulfonic acid, it also serves as an ingredient in cosmetic product formulations. It appears as a white crystalline solid with high solubility in water and polar solvents. This product has a CAS number of 6192-52-5, molecular formula CH3C6H4SO3H · H2O, and a molecular weight of 190.22 g/mol. It requires careful handling, marked with a Danger signal word for corrosive and hazardous properties, and is stored at ambient conditions. Molekula supplies p-Toluenesulfonic acid monohydrate from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
These pack sizes aren't a limit. Molekula manufactures, sources and repacks to order — if you need 500 kg and only see 1 kg listed, . We quote from grams to multi-tonne.
Need a different size? Add the nearest pack and change the size in your basket — we price it at the same rate per unit.
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1 kg — $108.20 per pack
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5 kg — $384.50 per pack
Need a different quantity or pack?
Tell us how much you need and when — drums, IBCs, sacks or a one-off bulk lot. We'll manufacture or source it and come back with a price.
Prices exclude VAT/sales tax and shipping.
Specifications
| Property | Value |
|---|---|
| Appearance | White/ light pink powder |
| Water (KF) | ≤ 13% |
| Identification (IR) | Conforms to Reference |
| Toluene Sulphonic acid | ≥ 88.0% |
| Total Acid | ≥ 97.2% |
| Sulfuric Acid | ≤ 0.3% |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Transport Class | 8 |
| Packing Group | III |
| Acidity | Acid |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Melting Point | 107 °C |
Source: PubChem CID 521998 (PAC Chemical Database)
Identification
| Property | Value |
|---|---|
| SKU | 22682449 |
| CAS Number | 6192-52-5 |
| IUPAC Name | 4-methylbenzenesulfonic acid;hydrate |
| Molecular Formula | CH3C6H4SO3H · H2O |
| Molecular Weight | 190.22 |
| Exact Mass | 190.03 |
| SMILES | CC1=CC=C(C=C1)S(=O)(=O)O.O |
| InChIKey | KJIFKLIQANRMOU-UHFFFAOYSA-N |
| InChI | InChI=1S/C7H8O3S.H2O/c1-6-2-4-7(5-3-6)11(8,9)10;/h2-5H,1H3,(H,8,9,10);1H2 |
| PubChem CID | 521998 |
| UN Number | UN2585 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 29041037 |
| Tariff Code | 2904100090 |
Safety & GHS
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Corrosive
GHS05
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Health Hazard
GHS07
Hazard statements
- H290 May be corrosive to metals
- H303 May be harmful if swallowed
- H314 (sub cat. 1C) Causes severe skin burns and eye damage
- H335 May cause respiratory irritation
- H412 Harmful to aquatic life with long lasting effects
Precautionary statements
- P261 Avoid breathing dust/fume/gas/mist/vapours/spray
- P273 Avoid release to the environment
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P303+361 IF ON SKIN (or hair): Remove immediately all contaminated clothing. Rinse with water/shower
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, Spanish.
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Synonyms
- 4-methylbenzene-1-sulfonic acid hydrate
- 4-methylbenzenesulfonic acid hydrate
- 4-Methylbenzenesulfonic acid monohydrate
- 4-methylbenzenesulphonic acid hydrate
- 4-toluenesulfonic acid monohydrate
- Benzenesulfonic acid, 4-methyl-, monohydrate
- p-toluenesulfonic acid hydrate
- p-Toluenesulphonic acid monohydrate
- para-toluenesulfonic acid monohydrate
- Toluene sulfonic acid
Frequently asked questions
What is p-Toluenesulfonic acid monohydrate commonly used for?
It is widely used as a catalyst in organic synthesis (e.g., esterification, polymerization), an acidifier in pharmaceuticals, and in the production of dyes, resins, and detergents.
What is the chemical formula and molecular weight of p-Toluenesulfonic acid monohydrate?
The formula is CH₃C₆H₄SO₃H · H₂O, and the molecular weight is 190.22 g/mol.
How should p-Toluenesulfonic acid monohydrate be stored?
Store in a tightly sealed container at ambient temperature, away from moisture and incompatible materials.
What grades of p-Toluenesulfonic acid monohydrate does Molekula supply?
Molekula supplies ACS reagent grade and technical grade p-Toluenesulfonic acid monohydrate.
Can Molekula supply p-Toluenesulfonic acid monohydrate in bulk quantities?
Yes, we offer bulk packaging options (e.g., 25 kg drums, 1-tonne containers) for industrial and large-scale applications.
What documentation is provided with an order of p-Toluenesulfonic acid monohydrate?
Each order includes a Certificate of Analysis (CoA), Material Safety Data Sheet (MSDS), and batch-specific documentation for traceability.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.