Question

S->SO2->H2SO3->Na2SO3​

Answer 1

S + O2 = SO2

SO2 + H2O = H2SO3

2NaOH + H2O + SO2 = Na2SO3 + 2H2O

Answer 2

The given sequence represents a chemical reaction pathway involving sulfur dioxide (SO2), sulfur trioxide (SO3), sulfurous acid (H2SO3), and sodium sulfite (Na2SO3). Each compound in the sequence is related to the previous one through chemical reactions. Here's a breakdown of the reactions:

1. Sulfur dioxide (SO2): This is a gas formed when elemental sulfur (S) reacts with oxygen (O2) during combustion or other oxidation processes. Equation: S + O2 -> SO2

2. Sulfur dioxide to sulfurous acid (H2SO3): Sulfur dioxide dissolves in water (H2O) to form sulfurous acid. Equation: SO2 + H2O -> H2SO3

3. Sulfurous acid to sodium sulfite (Na2SO3): Sulfurous acid can react with sodium hydroxide (NaOH) to form sodium sulfite, a salt. Equation: H2SO3 + 2NaOH -> Na2SO3 + 2H2O

Overall, the sequence represents the transformation of sulfur dioxide into sodium sulfite through the intermediate formation of sulfurous acid.