What is sulfurous acid, and how does it relate to #SO_2#?

Answer 1

#underbrace(SO_2(g))_"sulfur dioxide" + H_2O(l) rarr underbrace(H_2SO_3(aq))_"sulfurous acid"#

Sulfur dioxide is the acid anhydride of sulfurous acid, i.e. #H_2SO_3-=SO_2+H_2O#. While sulfurous acid can be deprotonated, often we can treat it as water saturated with sulfur dioxide, i.e. as #H_2O*SO_2# (which is of course formally #H_2SO_3#), The smell is sulfurous, but many people (including me!) find it pleasant, and antiseptic.

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Answer 2

Natalie Anton

Sulfurous acid (H2SO3) is a weak acid that is created when sulfur dioxide (SO2) dissolves in water. When SO2 reacts with water, it produces sulfurous acid (H2SO3(aq) = SO2(g) + H2O(l)). Sulfurous acid is a step between the formation of stronger sulfuric acid (H2SO4) and sulfurous acid (H2SO3).

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.