| Potassium bisulfate | |
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Potassium hydrogen sulfate |
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Other names
Potassium acid sulfate |
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| Identifiers | |
| CAS number | 7646-93-7 |
| PubChem | 516920 |
| EC number | 231-594-1 |
| UN number | 2509 |
| RTECS number | TS7200000 |
| Properties | |
| Molecular formula | KHSO4 |
| Molar mass | 136.169 g/mol |
| Density | 2.245 g/cm3 |
| Melting point |
197 °C, 470 K, 387 °F |
| Boiling point |
Dec. > 300 °C |
| Solubility in water | 490 g/L |
| Hazards | |
| MSDS | External MSDS |
| EU Index | 016-056-00-4 |
| EU classification | Corrosive (C) |
| R-phrases | R34, R36, R37, R38 |
| S-phrases | (S1/2), S26, S36/37/39, S45 |
| LD50 | 2340 mg/kg-1 |
| Related compounds | |
| Related compounds | Sodium bisulfate |
| (verify) (what is: /?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) |
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| Infobox references | |
Potassium bisulfate is the potassium salt of bisulfate anion, with the molecular formula KHSO4. This compound is commonly used in the conversion of tartrates to bitartrates in wine. Potassium bisulfate is also used as a disintegrating agent in analytical chemistry.
A solution of potassium bisulfate behaves as if the two related compounds (K2SO4 and H2SO4) were side by side uncombined. Adding ethanol to a solution of potassium bisulfate precipitates out sulfate.
Mercallite, the mineralogical form of potassium bisulfate, occurs very rarely. Misenite is the other, more complex, potassium hydrogen sulfate.
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