antimony pentasulfide antimony pentasulfide antimony pentasulfide is an inorganic compound of antimony and sulfur, also known as antimony red. it is a nonstoichiometric compound with a variable composition. its structure is unknown. commercial samples are contaminated with sulfur, which may be removed by washing with carbon disulfide in a soxhlet extractor. antimony pentasulfide names other names antimony red identifiers cas number 1315-04-4 y 3d model (jsmol) interactive image chebi chebi:134733 chemspider 17615643 y echa infocard 100.013.869 ec number 215-255-5 pubchem cid 16683083 unii 1433f1i86n y comptox dashboard (epa) dtxsid8046583 inchi inchi=1s/5s.2sb ykey: ppkvrekqvqreqd-uhfffaoysa-n y smiles s=(=s)s(=s)=s properties chemical formula sb2s5 molar mass 403.82 g·mol−1 appearance red powder density 4.12 g/cm 3 melting point 135 °c (275 °f; 408 k) (decomposes) solubility in water insoluble solubility soluble in hcl, alkalis, ammonium hydrosulfide pharmacology atc code r05ca07 (who) hazards ghs labelling: pictograms signal word warning hazard statements h228, h302, h332, h411 precautionary statements p210, p240, p241, p261, p264, p270, p271, p273, p280, p301+p312, p304+p312, p304+p340, p312, p330, p370+p378, p391, p501 flash point flammable niosh (us health exposure limits): pel (permissible) twa 0.5 mg/m3 (as sb) rel (recommended) twa 0.5 mg/m3 (as sb) related compounds related compounds antimony(iii) sulfide except where otherwise noted, data are given for materials in their standard state (at 25 °c , 100 kpa). n verify (what is yn ?) infobox references production antimony pentasulfide can be produced by the reaction of antimony with sulfur at a temperature from 250-400 °c in an inert atmosphere. uses it may be used as a red pigment and is one possible precursor to schlippe's salt, na3sbs4·9h2o, which can be prepared according to the equation: 3 na2s + sb2s5 + 9 h2o → 2 na3sbs4·9h2o it is also used in the vulcanization of rubber to produce red rubber. physical chemistry like many sulfides, this compound liberates hydrogen sulfide upon treatment with strong acids such as hydrochloric acid. 6 hcl + sb2s5 → 2 sbcl3 + 3 h2s + 2 s analysis by mössbauer spectroscopy indicates that this compound is a derivative antimony(iii), explaining the production of antimony(iii) chloride, rather than antimony(v) chloride, upon acidification. it is, therefore, not analogous to the phosphorus(v) compound phosphorus pentasulfide.