Bisulfite ion (IUPAC-recommended nomenclature: hydrogen sulfite) is the ion HSO3. Salts containing the HSO3 ion are termed bisulfites also known as sulfite lyes. For example, sodium bisulfite is NaHSO3.


Bisulfite salts are typically prepared by treatment of alkaline solutions with excess sulfur dioxide::SO2 + NaOH → NaHSO3

HSO3 is the conjugate base of sulfurous acid, H2SO3::H2SO3 unicode|⇌ HSO3 + H+Sulfurous acid is not an isolable compound and does not appear to exist in solution either. An equilibrium that is much more consistent with spectroscopic evidence is given ::SO2 + H2O unicode|⇌ HSO3 + H+

HSO3 is a weakly acidic species with a p"K"a of 6.97. Its conjugate base is the sulfite ion, SO32−::HSO3 unicode|⇌ SO32− + H+


Most evidence suggests that the proton in bisulfite ion is located on sulfur, giving rise to "C"3v symmetry. There is, however, some evidence from 17O NMR spectroscopy to suggest that two tautomeric forms of HSO3 exist in dynamic equilibrium, one having "C"3v symmetry (protonated at sulfur) and other "C"s symmetry (protonated at oxygen) [D. A. Horner, R. E. Connick, "Inorg. Chem." 25, 2414-7 (1986).] . The "C"3v structure is supported by X-ray crystallography and, in aqueous solution, by Raman spectroscopy (ν(S–H) = 2500 cm−1).


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  • bisulfite — ● bisulfite nom masculin Hydrogénosulfite MHSO3, où M désigne un métal alcalin. bisulfite n. m. CHIM Sulfite acide dérivant de l acide sulfureux et renfermant un atome d hydrogène. ⇒BISULFITE, subst. masc. CHIM. Synon. de sulfite acide. Bisulfite …   Encyclopédie Universelle

  • Bisulfite — Bisulfite,   veraltete Bezeichnung für Hydrogensulfite, Schwefelverbindungen …   Universal-Lexikon

  • bisulfite — [bī sul′fīt΄] n. an acid sulfite containing the monovalent negative radical HSO3 …   English World dictionary

  • Bisulfite — Représentation de la structure la plus courante de l ion bisulfite en solution et à l état solide …   Wikipédia en Français

  • bisulfite — /buy sul fuyt/, n. Chem. a salt of sulfurous acid, containing the HSO3 group; an acid sulfite; a hydrogen sulfite, as sodium bisulfite, NaHSO3. Also, bisulphite. [1885 90; BI 1 + SULFITE] * * * …   Universalium

  • bisulfite — (ˈ)bī+ noun Etymology: French, from bi bi (I) + sulfite : an acid sulfite (as potassium bisulfite KHSO3) : a hydrogen sulfite see bi I4 …   Useful english dictionary

  • bisulfite — noun Etymology: French, from bi + sulfite Date: circa 1846 an acid sulfite …   New Collegiate Dictionary

  • bisulfite — noun The univalent group HSO, or any salt containing it …   Wiktionary

  • bisulfite — A salt or ion of HSO3−. * * * bi·sul·fite or chiefly Brit bi·sul·phite .fīt n an acid sulfite * * * bi·sul·fite (bi sulґfīt) an acid sulfite …   Medical dictionary

  • bisulfite — n. salt of sulfuric acid …   English contemporary dictionary

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