POTASSIUM DISULFATE
Potassium pyrosulfate
CAS: 7790-62-7
Molecular Formula: K2O7S2
POTASSIUM DISULFATE - Names and Identifiers
POTASSIUM DISULFATE - Physico-chemical Properties
| Molecular Formula | K2O7S2 |
| Molar Mass | 254.32 |
| Density | 2.28 g/mL at 25 °C (lit.) |
| Melting Point | 325 °C |
| Water Solubility | MAY DECOMPOSE |
| Solubility | Soluble in water (25.4 g/l) at 20°C. |
| Appearance | Colorless crystal |
| Specific Gravity | 2.28 |
| Color | White |
| Odor | Odorless |
| Merck | 14,7664 |
| PH | 0.8 (50g/l, H2O, 20℃) |
| Storage Condition | no restrictions. |
| Stability | Stable. Incompatible with strong acids, strong bases. |
| Sensitive | Hygroscopic |
| MDL | MFCD00011385 |
| Use | Chemical analysis used as an acidic solvent, steel analysis used as Electrolytic metal inclusion agent |
POTASSIUM DISULFATE - Risk and Safety
| Hazard Symbols | C - Corrosive |
| Risk Codes | 34 - Causes burns |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36/37/39 - Wear suitable protective clothing, gloves and eye/face protection. S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) |
| UN IDs | UN 3260 8/PG 2 |
| WGK Germany | 3 |
| HS Code | 2833 29 80 |
| Hazard Class | 8 |
| Packing Group | II |
POTASSIUM DISULFATE - Upstream Downstream Industry
| Raw Materials | Sulfuric acid Potassium Sulphate Potassium hydroxide |
POTASSIUM DISULFATE - Nature
Open Data Verified Data
colorless crystals or frit. Melting point about 325 °c; d 280. Deliquescence. Soluble in water, the solution was strongly acidic.
Last Update：2025-06-10 22:55:16
POTASSIUM DISULFATE - Preparation Method
Open Data Verified Data
sulfuric acid was added to powdered potassium sulfate, and after completion of the reaction at a certain temperature, the reaction mixture was cooled.
Last Update：2025-06-10 22:55:16
POTASSIUM DISULFATE - Introduction
It's hygroscopic. Easily soluble in water, the aqueous solution is strongly acidic. Commodities are often a mixture of nearly 70% potassium pyrosulfate 30% potassium bisulfate.
Last Update：2022-10-16 17:28:52
POTASSIUM DISULFATE - Application
Open Data Verified Data
inclusion agents used as electrolytic metals in steel analysis. It is used as an acidic solvent in analytical chemistry.
Last Update：2025-08-19 16:24:40
POTASSIUM DISULFATE - Reference Information
| pH range of acid-base indicator discoloration | 1 - 2 at 25.5g/l at 25°C |
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| Use | chemical analysis for acidic solvents, steel analysis was used as an inclusion agent for Electrolytic metal acidic solvent for chemical analysis. Steel was analyzed as an inclusion agent for electrolytic metals. |
| production method | 1. The powdery potassium sulfate is added with sulfuric acid, and after the reaction is completed at a certain temperature, the reaction is cooled to 50-60 ° C. And caked, and then sealed and preserved. 2. Burning potassium hydrogen sulfate can generate potassium pyrosulfate. 250g of potassium hydrogen sulfate was placed in a porcelain dish having a volume of 320, and heated to 340 °c in a muffle furnace. After 30min, the temperature was raised to-°c. Potassium bisulfate begins to decompose and foam, and water vapor emerges. When bubbling was stopped and white SO3 gas was generated, it was indicated that the polycondensation process of KHSO4 was completed. The resulting melt was transferred to a porcelain mortar, cooled to 50-60 °c, crushed while hot, and quickly transferred into the mill bottle and sealed with paraffin. 3. The potassium hydrogen sulfate is heated to 250 ℃, maintained for 30min, heated to 320~340 ℃, and decomposed: when bubbles are stopped and sulfur trioxide vapor appears, the heating is continued for 5~10min to stop burning, potassium pyrosulfate was obtained by cooling to 50-60 °c and crushing the melt, and sealed for storage. |
Last Update：2024-04-10 22:29:15
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View History
POTASSIUM DISULFATE
Vanadium(II) chloride
DIFLUOROACETIC ACID
2-Hydroxy Phosphonoacetic Acid
Magnesite dust
Vanadium(II) chloride
DIFLUOROACETIC ACID
2-Hydroxy Phosphonoacetic Acid
Magnesite dust
Raw Materials for POTASSIUM DISULFATE