English Vocabulary Flash Cards - Chemical Formulas @ englishpdf.com and englishteststore.com File 116 FeO2H goethite FeO2H · n H2O limonite Fe(OH)2 iron(II) hydroxide Fe(OH)3 iron(III) hydroxide FeO4S ferrous sulfate FeO8H4P2 iron(II) dihydrogen phosphate FeP iron(III) phosphide FeS iron sulfide or iron(II) sulfide