. Ironically, SO2 could be extracted from gas emissions by passing it through a solution of sulfite ion, SO3^2_.

(a) Assuming sulfite ion acts as a base and the sulfur dioxide is present in water initially as sulfurous acid, write an acidbase reaction between the species.

(b) Devise a scheme by which dilute sulfur dioxide in an emission gas could be captured by an aqueous solution of sulfite ion,

and later released as a concentrated stream of SO2.