* Sulfurous acid is unstable in water. When sulfur dioxide (SO₂) dissolves in water, it forms sulfurous acid. This reaction is reversible, meaning the sulfurous acid can decompose back into sulfur dioxide and water.
* No new compound forms. The combination of sulfurous acid and water essentially results in a solution of sulfur dioxide in water, with the sulfurous acid existing in an equilibrium state.
Here's the chemical equation:
SO₂ (g) + H₂O (l) ⇌ H₂SO₃ (aq)
So, while you can mix sulfurous acid and water, it doesn't produce a new compound. The mixture remains as a solution of sulfurous acid in water.
