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Question
What is formed when sulphur dioxide reacts with water?What is the formula for the product?
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Solution
It reacts to form sulphurous acid H2SO3. Unlike Sulphuric acid H2SO4, sulphurous acid is a weak acid and only partially dissociates in solution
H2O + SO2 ⇌ H2SO3
H2SO3 + H2O ⇌ HSO3- + H3O+
Pure H2SO3 cannot however be isolated, as it decomposes back to sulphur dioxide gas & water if evaporation is attempted. The sulphite and bisulphite ions (conjugate bases) for the acid are however fairly common.
It reacts to form sulphurous acid H2SO3. Unlike Sulphuric acid H2SO4, sulphurous acid is a weak acid and only partially dissociates in solution
H2O + SO2 ⇌ H2SO3
H2SO3 + H2O ⇌ HSO3- + H3O+
Pure H2SO3 cannot however be isolated, as it decomposes back to sulphur dioxide gas & water if evaporation is attempted. The sulphite and bisulphite ions (conjugate bases) for the acid are however fairly common.
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