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# What is the formula for the conjugate base for HSO3?

For bisulfite, ##HSO_3^-##, the conjugate base is sulfite ion, ##SO_3^(2-)##.

Sulfur dioxide dissolved in water gives sulfurous acid, ##H_2SO_3##. The conjugate base of this material is the original less a proton, i.e. ##HSO_3^(-)##, and the conjugate base of this material is ##SO_3^(2-)##.