Which species is amphoteric?

Which species is amphoteric?

A species which is amphoteric can behave either as an acid or as a base. In your case, it will be HSO3^-, but not for the reasons you might think. For instance, it won’t react with H+ to make H2SO3, since H2SO3 doesn’t exist in molecular form.
base:
HSO3^- + H+ <==> H2O + SO2(g)
Acid:
HSO3- + OH- <==> HOH + SO3^2-
======= Follow up =========
A.S. has made the “H2SO3” mistake. When we way “sulfurous acid” we must realize that there are no molecules of H2SO3 present. Sulfurous acid, like carbonic acid, is a fictitious acid, and doesn’t exist in the molecular form in solution.
Sulfurous acid:
SO2(g) + H2O <==> H+ + HSO3^-
Carbonic acid:
CO2(g) + H2O <==> H+ + HCO3^-

amphoteric – can either gain H+ or loose H+
so ans is e.HSO3-
HSO3- —–> H+ + SO3 2- ( acidic)
HSO3- + H+ ——> H2SO3 (basic)
edit – although H2SO3 has not been detected in solution but the molecule has been detected in gas phase
edit – ok thank-you so much for correcting me ….i will try to give better answer next time ….thanks

Leave a Comment