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Other names
Monothiophosphoric acid
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Identifiers | |
3D model (JSmol)
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ChemSpider | |
PubChem CID
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UNII | |
CompTox Dashboard (EPA)
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Properties | |
H3PO3S | |
Molar mass | 114.061 |
Appearance | colorless |
Acidity (pKa) | 1.79, 5.42, 10.08[1] |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Thiophosphoric acid is an inorganic compound with the chemical formula H3PO3S. Structurally, it is the acid derived from phosphoric acid with one oxygen atom replaced by sulfur atom, although it cannot be prepared from phosphoric acid. It is a colorless compound that is rarely isolated in pure form, but rather as a solution. The structure of the compound has not been reported, but two tautomers are reasonable: S=P(−OH)3 and O=P(−OH)2(−SH).