The bisulfite ion is the HSO₃^- ion. It is the conjugate base of sulfurous acid, H₂SO₃. Salts containing the HSO₃^- ion are bisulfite [salt]s It is a weakly acidic substance which has a pKa of 6.97. In the field of chemistry, in the Brønsted-Lowry (protonic) theory of acids and bases, a conjugate base is the basic member, X-, of a pair of compounds that differ only by the presence or absence of a proton at a certain position. ... Sulfurous acid (or sulphurous acid in British spelling) is a name given to aqueous solutions of sulfur dioxide. ... In chemistry and biochemistry, acid dissociation constant, the acidity constant, or the acid-ionization constant () is a specific type of equilibrium constant that indicates the extent of dissociation of hydrogen ions from an acid. ...

HSO₃^- + H₂O → H₃O⁺ + SO₄^2- In chemistry, hydronium is the common name for the cation H3O+. // Nomenclature According to IUPAC ion nomenclature, it should be referred to as oxonium. ... In inorganic chemistry, a sulfate (IUPAC-recommended spelling; also sulphate in British English) is a polyatomic anion or a compound containing this group. ...

The bisulfite ion consists of a central sulfur atom, single bonded to three oxygens and a hydrogen.

Examples

• Sodium bisulfite, NaHSO₃

Sodium hydrogen sulfite or sodium bisulfite is a chemical compound with the chemical formula NaHSO3. ...

See also

• Sulfurous acid
• Sulfite
• Sulfate