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Phosphonic acid

Names IUPAC namePhosphonic acidSystematic IUPAC namePhosphorous acidOther names Dihydroxyphosphine oxideDihydroxy(oxo)-λ-phosphane Dihydroxy-λ-phosphanone Orthophosphorous acid Oxo-λ-phosphanediol Oxo-λ-phosphonous acid Metaphosphoroic acidIdentifiers CAS Number13598-36-23D model (JSmol)HP(O)(OH)2: Interactive imageP(OH)3: Interactive imageChEBICHEBI:44976ChEMBLChEMBL1235291ChemSpider10449259ECHA InfoCard100.033.682EC Number237-066-7Gmelin Reference1619 KEGGC06701PubChemCID107909RTECS numberSZ6400000UNII35V6A8JW8EUN number2834 CompTox Dashboard(EPA)DTXSID2049715InChIInChI=1S/H3O3P/c1-4(2)3/h4H,(H2,1,2,3)Key: ABLZXFCXXLZCGV-UHFFFAOYSA-NInChI=1/H3O3P/c1-4(2)3/h4H,(H2,1,2,3)Key: ABLZXFCXXLZCGV-UHFFFAOYAFSMILESHP(O)(OH)2: OP(=O)OP(OH)3: OP(O)OProperties Chemical formulaH3PO3Molar mass81.99 g/mol Appearance white solid deliquescentDensity1.651 g/cm (21 °C) Melting point73.6 °C (164.5 °F; 346.8 K) Boiling point200 °C (392 °F; 473 K) (decomposes) Solubility in water310 g/100 mL Solubilitysoluble in ethanolAcidity (pKa) 1.3, 6.7 Magnetic susceptibility (χ)−42.5·10 cm/mol Structure Molecular shapepseudo-tetrahedral Hazards Occupational safety and health (OHS/OSH): Main hazardsskin irritant GHS labelling: PictogramsSignal wordDangerHazard statementsH302, H314Precautionary statementsP260, P264, P270, P280, P301+P312, P301+P330+P331, P303+P361+P353, P304+P340, P305+P351+P338, P310, P321, P330, P363, P405, P501NFPA 704 (fire diamond) 301Safety data sheet (SDS) Sigma-AldrichRelated compounds Related compoundsH3PO4 (i.e., PO(OH)3)H3PO2 (i.e., H2PO(OH))Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).Nverify ( ?)

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