Molekula
Sulfanilic acid
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
Sulfanilic acid is an aromatic sulfonic acid derivative used primarily as an intermediate in dye manufacturing, pharmaceuticals, and analytical chemistry. It serves as a key reagent in the synthesis of azo dyes, sulfa drugs, and various organic compounds. This white to off-white crystalline powder has a CAS number of 121-57-3, a molecular formula of 4-(H2N)C6H4SO3H, and a molecular weight of 173.19 g/mol. It is stable under ambient storage conditions but requires careful handling due to its warning-level hazards. Molekula supplies Sulfanilic acid 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.
Often bought together
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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100 g — £27.00 per pack ex VAT · £32.40 inc. VAT
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500 g — £38.00 per pack ex VAT · £45.60 inc. VAT
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1 kg — £57.60 per pack ex VAT · £69.12 inc. VAT
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 to grey powder |
| Assay | ≥99.0% |
| Moisture | ≤0.5% |
| Water insoluble matter | ≤0.1% |
| Aniline | ≤0.02% |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Acid |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Melting Point | 288 °C decomposes without melting |
| Solubility (other solvents) | Soluble in fuming hydrochloric acid |
| Vapour Pressure | 0.0000002 mmHg |
| pKa | pKa = 3.25 |
| log P (octanol/water) | -2.16 |
Source: PubChem CID 8479 (HSDB, Haz-Map)
Identification
| Property | Value |
|---|---|
| SKU | 18836625 |
| CAS Number | 121-57-3 |
| IUPAC Name | 4-aminobenzenesulfonic acid |
| EC Number | 204-482-5 |
| Molecular Formula | 4-(H2N)C6H4SO3H |
| Molecular Weight | 173.19 |
| Exact Mass | 173.0147 |
| SMILES | C1=CC(=CC=C1N)S(=O)(=O)O |
| InChIKey | HVBSAKJJOYLTQU-UHFFFAOYSA-N |
| InChI | InChI=1S/C6H7NO3S/c7-5-1-3-6(4-2-5)11(8,9)10/h1-4H,7H2,(H,8,9,10) |
| PubChem CID | 8479 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 29214222 |
| Tariff Code | 2921420090 |
Safety & GHS
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Health Hazard
GHS07
Hazard statements
- H315 Causes skin irritation
- H317 May cause an allergic skin reaction
- H319 Causes serious eye 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
- P302+352 IF ON SKIN: Wash with soap and water
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
- P308+313 IF exposed or concerned: Get medical advice/attention
- P333+313 IF skin irritation or a rash occurs: Get medical advice/attention
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-Aminobenzenesulfonic acid
- Aniline-4-sulfonic acid
- Aniline-p-sulfonic acid
- Aniline-p-sulphonic acid
- Kyselina sulfanilova
- p-Aminobenzenesulfonic acid
- p-Aminophenylsulfonic acid
- p-Anilinesulfonic acid
- Sulfanilsaeure
- Sulphanilic acid
Frequently asked questions
What is sulfanilic acid commonly used for?
Sulfanilic acid is primarily used in the production of dyes, pharmaceuticals (e.g., sulfonamides), and as a reagent in analytical chemistry for detecting nitrates and nitrites.
What is the molecular formula and molecular weight of sulfanilic acid?
The molecular formula is **4-(H₂N)C₆H₄SO₃H**, and the molecular weight is **173.19 g/mol**.
What is the recommended storage condition for sulfanilic acid?
Store sulfanilic acid at **ambient temperature** in a cool, dry place, away from direct sunlight and incompatible substances.
What grades of sulfanilic acid does Molekula supply?
Molekula supplies **analytical reagent (AR) grade** and **technical grade** sulfanilic acid, depending on application requirements.
Can Molekula supply sulfanilic acid in bulk quantities?
Yes, Molekula can supply sulfanilic acid in **bulk quantities** (minimum order quantities may apply—please contact sales for details).
What documentation comes with a sulfanilic acid order?
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.