Molekula
Potassium hydrogen sulfate
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
Potassium hydrogen sulfate is a strong acid salt used in chemical synthesis, pH adjustment, and as a catalyst in organic reactions. Its documented applications also include acting as a flux for ores and siliceous materials, producing fertilizers and soil amendments, and use in winemaking. It appears as a white crystalline solid and is highly hygroscopic. Available in 100g, 1kg, and 5kg packaging, it has a molecular weight of 136.17 g/mol, a CAS number of 7646-93-7, and should be stored at ambient temperatures. It is classified as dangerous due to its corrosive nature. Molekula supplies Potassium hydrogen sulfate 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 — $93.40 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/ off white crystalline powder |
| Heavy metals | ≤0.002% |
| Identification | Conforms to reference |
| Chloride (Cl-) | ≤0.002% |
| Assay | 98.0 - 102.0% |
| Iron (Fe) | ≤0.002% |
| Calcium (Ca) | ≤0.02% |
| Ammonium (NH4+) | ≤0.002% |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Transport Class | 8 |
| Packing Group | II |
| Acidity | Acid |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Solubility (other solvents) | Freely soluble in water, insoluble in ethanol |
Source: PubChem CID 516920 (EU Food Improvement Agents)
Identification
| Property | Value |
|---|---|
| SKU | 19700986 |
| CAS Number | 7646-93-7 |
| IUPAC Name | potassium hydrogen sulfate |
| EC Number | 231-594-1 |
| Molecular Formula | KHSO4 |
| Molecular Weight | 136.17 |
| Exact Mass | 135.9233 |
| SMILES | OS(=O)(=O)[O-].[K+] |
| InChIKey | CHKVPAROMQMJNQ-UHFFFAOYSA-M |
| InChI | InChI=1S/K.H2O4S/c;1-5(2,3)4/h;(H2,1,2,3,4)/q+1;/p-1 |
| PubChem CID | 516920 |
| UN Number | UN2509 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 2833.29.5190 |
| Tariff Code | 2833298080 |
Safety & GHS
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Corrosive
GHS05
-
Health Hazard
GHS07
Hazard statements
- H290 May be corrosive to metals
- H314 (sub cat. 1B) Causes severe skin burns and eye damage
- H335 May cause respiratory irritation
Precautionary statements
- P260 Do not breathe dust/fume/gas/mist/vapours/spray
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P301+330 IF SWALLOWED: Rinse mouth. Do NOT induce vomiting
- P304+312 IF INHALED: Call a POISON CENTER or doctor/physician if you feel unwell
- 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
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, Portuguese, 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
- Caswell No. 682C
- EPA Pesticide Chemical Code 005605
- INS NO.515(II)
- Monopotassium hydrogen sulfate
- Potassium acid sulfate
- Potassium bisulfate
- Potassium hydrogen sulfate, solid
- Potassium hydrosulfate (KHSO4)
- Sal enixum
- Sulfuric acid, monopotassium salt
Frequently asked questions
What is potassium hydrogen sulfate used for?
It is commonly used as a reagent in analytical chemistry and in the production of other potassium salts.
What is the chemical formula and molecular weight of potassium hydrogen sulfate?
The formula is KHSO4 and the molecular weight is 136.17 g/mol.
How should potassium hydrogen sulfate be stored?
It should be stored at ambient temperature, away from moisture and incompatible materials.
What grade is available for potassium hydrogen sulfate?
It is available in reagent grade and technical grade, depending on the application.
Can Molekula supply potassium hydrogen sulfate in bulk?
Yes, Molekula can supply potassium hydrogen sulfate in bulk quantities; please contact sales for details.
What documentation comes with an order of potassium hydrogen sulfate?
Each order includes a Certificate of Analysis and Safety Data Sheet (SDS) with the shipment.
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.