inorganic sodium salt sulfide salt sodium sulfide (anhydrous) 77.952 78.04500 A sulfide salt with formula Na2S. The pentahydrate and (particularly) the nonahydrate are also known. In gel form, sodium sulfide is used to soften toenails to assist in trimming (and so relive pain) of ingrowing toenails. CAS:1313-82-2 CHEBI:76183 CHEBI:76208 GRVFOGOEDUUMBP-UHFFFAOYSA-N InChI=1S/2Na.S/q2*+1;-2 Na2S Na2S PMID:12793804 PMID:14848282 PMID:19810706 Reaxys:11323291 Wikipedia:Sodium_sulfide [Na+].[Na+].[S--] anh. sodium sulfide anhydrous sodium sulfide chebi_ontology disodium monosulfide disodium sulfide disodium sulfide sodium monosulfide sodium sulfide (anh.) sodium sulfuret sodium sulphide