Potassium bisulfate
- CAS No.
- 7646-93-7
- Chemical Name:
- Potassium bisulfate
- Synonyms
- KHSO4;POTASSIUM HYDROGEN SULFATE;POTASSIUM BISULPHATE;POTASSIUM HYDROGEN SULPHATE;Kaliumhydrogensulfat;POTASSIUM HYDROGEN SULPHATE pure;salenixum;Potassium bisuL;POTASSIUM BISULFATE;monopotassiumsulfate
- CBNumber:
- CB9370612
- Molecular Formula:
- HKO4S
- Molecular Weight:
- 136.16884
- MDL Number:
- MFCD00011404
- MOL File:
- 7646-93-7.mol
- MSDS File:
- SDS
- TDS File:
- TDS
| Melting point | 214 °C(lit.) |
|---|---|
| Boiling point | decomposes [STR93] |
| bulk density | 1140kg/m3 |
| Density | 2.32 g/mL at 25 °C(lit.) |
| storage temp. | Store at +5°C to +30°C. |
| solubility | H2O: 1 M at 20 °C, clear, colorless |
| form | Solid |
| color | White |
| Specific Gravity | 2.322 |
| PH | 1 (50g/l, H2O, 20℃) |
| Water Solubility | soluble |
| Sensitive | Hygroscopic |
| Merck | 14,7613 |
| Stability | Stable. Moisture sensitive. |
| InChI | 1S/K.H2O4S/c;1-5(2,3)4/h;(H2,1,2,3,4)/q+1;/p-1 |
| InChIKey | CHKVPAROMQMJNQ-UHFFFAOYSA-M |
| SMILES | [K+].OS([O-])(=O)=O |
| CAS DataBase Reference | 7646-93-7(CAS DataBase Reference) |
| FDA UNII | 1J1K03241F |
| EPA Substance Registry System | Potassium bisulfate (7646-93-7) |
| UNSPSC Code | 12352302 |
| NACRES | NB.24 |
SAFETY
Risk and Safety Statements
| Symbol(GHS) |   GHS05,GHS07 |
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Signal word | Danger | |||||||||
| Hazard statements | H303-H314-H335 | |||||||||
| Precautionary statements | P501-P260-P271-P264-P280-P312-P303+P361+P353-P301+P330+P331-P363-P304+P340+P310-P305+P351+P338+P310-P403+P233-P405 | |||||||||
| target organs | Respiratory system | |||||||||
| PPE | Eyeshields, Faceshields, Gloves, type P3 (EN 143) respirator cartridges | |||||||||
| Hazard Codes | C | |||||||||
| Risk Statements | 34-37 | |||||||||
| Safety Statements | 26-36/37/39-45 | |||||||||
| RIDADR | UN 2509 | |||||||||
| WGK Germany | 1 | |||||||||
| RTECS | TS7200000 | |||||||||
| F | 3 | |||||||||
| TSCA | TSCA listed | |||||||||
| HS Code | 2833 29 80 | |||||||||
| HazardClass | 8 | |||||||||
| PackingGroup | II | |||||||||
| Storage Class | 8B - Non-combustible corrosive hazardous materials | |||||||||
| Hazard Classifications | Eye Dam. 1 Skin Corr. 1B STOT SE 3 |
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| Toxicity | LD50 orally in Rabbit: 2340 mg/kg | |||||||||
| REACH Registrations | Active | |||||||||
| Limited Quantities | 1 Kg (2.2 lbs) (solid) | |||||||||
| Excepted Quantities | Max Inner Pack (30g or 30ml) and Max Outer Pack (500g or 500ml) | |||||||||
| NFPA 704 |
|
Potassium bisulfate price More Price(52)
| Manufacturer | Product number | Product description | CAS number | Packaging | Price | Updated | Buy |
|---|---|---|---|---|---|---|---|
| Sigma-Aldrich | 223476 | Potassium bisulfate reagent grade | 7646-93-7 | 500g | $204 | 2026-04-30 | Buy |
| Sigma-Aldrich | 1.04885 | Potassium hydrogen sulfate for analysis EMSURE? Reag. Ph Eur | 7646-93-7 | 500g | $167 | 2026-04-30 | Buy |
| Sigma-Aldrich | 223476 | Potassium bisulfate reagent grade | 7646-93-7 | 1kg | $257 | 2026-04-30 | Buy |
| Sigma-Aldrich | 1.04885 | Potassium hydrogen sulfate for analysis EMSURE? Reag. Ph Eur | 7646-93-7 | 25kg | $8310 | 2026-04-30 | Buy |
| TRC | TRC-P699080-5G | Potassium Hydrogen Sulfate | 7646-93-7 | 5g | $84 | 2026-06-03 | Buy |
Potassium bisulfate Chemical Properties, Uses, Production
Chemical Properties
Potassium bisulfate, also known as potassium hydrogen sulfate and potassium acid sulfate, KHS04 is water soluble, white deliquescent crystals,which melt at 214°C. Potassium bisulfate dissolved in water undergoes ionization to form K+, H+, SO42-. It is used in wine making, fertilizer manufacture, and as a flux and food preservative.
Uses
Potassium hydrogen sulfate is used in the conversion of tartrates to bitartrates in wine. It serves as a disintegrating agent in analytical chemistry and as an intermediate in the preparation of potassium persulfate by electrolysis. It is also employed in the manufacturing of fertilizers.
Application
Potassium bisulfate may be used:
As a catalyst for the preparation of butyl paraben from p-hydroxybenzoic acid and n-butyl alcohol.
As a promoter for the synthesis of 3,4-dihydropyrimidin-2(1H)-one derivatives via Biginelli reaction in ethylene glycol.
As an acid catalyst for the synthesis of ethyl tert-butyl ether (ETBE) from ethanol and tert-butyl alcohol via reactive distillation.
As a dehydrating agent for the synthesis of pyruvic acid from tartaric acid.
Preparation
Potassium bisulfate is typically made by heating potassium sulfate (K2SO4) with sulfuric acid. The acid provides the hydrogen needed to convert the salt (K2SO4) to the corresponding acid salt (KHSO4).
General Description
Potassium hydrogen sulfate is a colorless crystalline solid with a sulfur odor. It may cause illness from ingestion. If heated to high temperatures it may emit toxic fumes. It is used as flux in analysis of ores and siliceous Compounds.
Air & Water Reactions
Fused salt is deliquescent, Soluble in water, yielding a corrosive acidic solution.
Reactivity Profile
Acidic salts, such as Potassium bisulfate , are generally soluble in water. The resulting solutions contain moderate concentrations of hydrogen ions and have pH's of less than 7.0. They react as acids to neutralize bases. These neutralizations generate heat, but less or far less than is generated by neutralization of inorganic acids, inorganic oxoacids, and carboxylic acid. They usually do not react as either oxidizing agents or reducing agents but such behavior is not impossible. Many of these compounds catalyze organic reactions.
Health Hazard
TOXIC; inhalation, ingestion or skin contact with material may cause severe injury or death. Contact with molten substance may cause severe burns to skin and eyes. Avoid any skin contact. Effects of contact or inhalation may be delayed. Fire may produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause pollution.
Fire Hazard
Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes. Some are oxidizers and may ignite combustibles (wood, paper, oil, clothing, etc.). Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated.
Safety Profile
Moderately toxic by ingestion. A corrosive irritant to the skin, eyes, and mucous membranes. When heated to decomposition it emits toxic fumes of SOx and K2O. Can form an explosive mixture. See also SULFATES.
Purification Methods
Crystallise it from H2O (1mL/g) between 100o and 0o. It is also formed when a warm solution of K2SO4 in conc H2SO4 is cooled down.
Potassium bisulfate Preparation Products And Raw materials
Raw materials
Preparation Products
1of5
| Supplier | Tel | Country | ProdList | Advantage | |
|---|---|---|---|---|---|
| Langfang Ganyao Technology Co., LTD | 0316-2617888 17301291189 | bjjhtyhg@163.com | China | 478 | 58 |
| Hangzhou Bingochem Co., Ltd. | 0571-87658025 | sales@bingochem.com | China | 21532 | 58 |
| Tianjin Jinhui Taiya Chemical Reagent Co., Ltd | 022-59582624 18622766592 | 2163746375@qq.com | China | 271 | 58 |
| Meryer (Shanghai) Chemical Technology Co., Ltd. | 4006356688 18621169109 | market03@meryer.com | China | 40202 | 62 |
| Alfa Aesar | 400-6106006 | saleschina@alfa-asia.com | China | 30103 | 84 |
| Energy Chemical | 400-0056266 | sales8178@energy-chemical.com | China | 44850 | 61 |
| Adamas Reagent, Ltd. | 400-6009262 15618770481 | yhx@titansci.com | China | 14098 | 59 |
| Shandong Xiya Chemical Co., Ltd | 13355009207 13355009207 | 3007715519@qq.com | China | 18722 | 57 |
| China Langchem Inc. | 0086-21-58956006 | China | 7798 | 57 | |
| Tianjin heowns Biochemical Technology Co., Ltd. | 400 638 7771 | sales@heowns.com | China | 14412 | 57 |
View Latest Price from Potassium bisulfate manufacturers
| Image | Update time | Product | Price | Min. Order | Purity | Supply Ability | Manufacturer | |
|---|---|---|---|---|---|---|---|---|
 |
2026-09-02 | Potassium bisulfate
7646-93-7
|
$1.00-50.00 | 1KG | 99% | 30 ton/month | Henan Fengda Chemical Co., Ltd | |
 |
2026-08-21 | Potassium bisulfate
7646-93-7
|
$1.00 | 1kg | 99% | 300tons | Hebei Dangtong Import and export Co LTD | |
 |
2026-05-28 | Potassium bisulfate
7646-93-7
|
$30.60 | 1KG | 99% | 5000kg | Hebei Chuanghai Biotechnology Co,.LTD |
-
- Potassium bisulfate
7646-93-7
- $1.00-50.00
- 99%
- Henan Fengda Chemical Co., Ltd
-
- Potassium bisulfate
7646-93-7
- $1.00
- 99%
- Hebei Dangtong Import and export Co LTD
-
- Potassium bisulfate
7646-93-7
- $30.60
- 99%
- Hebei Chuanghai Biotechnology Co,.LTD
