English Vocabulary Flash Cards - Chemical Formulas @ englishpdf.com and englishteststore.com File 123 HCO3− hydrogen carbonate ion HC3H5O3 lactic acid HC5H5N+ pyridinium ion HC6H7O6 ascorbic acid HC9H7O4 acetylsalicylic acid HC12H17ON4SCl2 thiamine hydrochloride or vitamin B1 hydrochloride HCl hydrochloric acid HClO hypochlorous acid