SAT II Chemistry Exam Prep

Category - Multiple Choice

Which of the following is the correct molecular formula for sulfurous acid?
  1. SO42-
  2. H2SO3
  3. H2SO4
  4. H2S
  5. HS-
Explanation
Answer: H2SO3

This problem addresses the nomenclature of oxyacids. Sulfurous acid is related to the sulfite ion, SO32-. In the context of the question, there is only one compound that contains this structure. Thus, the molecular formula for sulfurous acid is H2SO3.
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