The acid formed by hydration of sulfur dioxide is....?

1 Answer
anor277
Jan 30, 2016

Is sulfurous acid, formally #H_2SO_3#.

Explanation:

You can still see these elaborate glass bubblers gathering dust in old laboratories that were expressly for this purpose.

#SO_2(g) + H_2O(l) rarr H_2SO_3(aq)#

This sulfurous acid is saturated #SO_2(aq)#, i.e. #SO_2*H_2O#. This is still an acidic oxide that may be reacted (and titrated) with hydroxide ion.

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