Does this mean that SO2 grabs an Oxygen out of every second OH(-) group present in the solution?

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1 Answer
Feb 10, 2016

Probably not. It means that the sulfur oxides are the acid anhydrides of common acids.


So what is an acid anhydride? It is the acid LESS the elements of water, #H_2O#. The acid anhydride of sulfuric acid #H_2SO_4# is #SO_3(g)#, the acid anhydride of sulfurous acid, #H_2SO_3# is #SO_2(g)#. Of course, these are formalisms, but they do help us to rationalize reactivity as an acid-base phenomenon when the sulfur oxides are dissolved in water.