Question

S==>SO2==>H2SO3==>NaSO3==>SO2

Answer 1

S + O2 = SO2
SO2 + H2O = H2SO3
H2SO3 + NaOH = NaHSO3 + H2O
2NaHSO3 = H2O + SO2 + Na2SO3

Answer 2

Chemical Reactions: S -> SO2 -> H2SO3 -> NaSO3 -> SO2

The given chemical reaction sequence is as follows: S -> SO2 -> H2SO3 -> NaSO3 -> SO2.

Let's break down each step of the reaction sequence:

1. S -> SO2: - The first step involves the conversion of sulfur (S) to sulfur dioxide (SO2). - The reaction can be represented as: S + O2 -> SO2. - This reaction occurs when sulfur reacts with oxygen gas. - The balanced equation for this reaction is: 2S + 3O2 -> 2SO2.

2. SO2 -> H2SO3: - In the second step, sulfur dioxide (SO2) reacts with water (H2O) to form sulfurous acid (H2SO3). - The reaction can be represented as: SO2 + H2O -> H2SO3. - This reaction is an example of an acid-base reaction, where SO2 acts as an acid and H2O acts as a base. - The balanced equation for this reaction is: SO2 + H2O -> H2SO3.

3. H2SO3 -> NaSO3: - In the third step, sulfurous acid (H2SO3) reacts with sodium hydroxide (NaOH) to form sodium sulfite (Na2SO3). - The reaction can be represented as: H2SO3 + 2NaOH -> Na2SO3 + 2H2O. - This reaction is an example of a neutralization reaction, where an acid reacts with a base to form a salt and water. - The balanced equation for this reaction is: H2SO3 + 2NaOH -> Na2SO3 + 2H2O.

4. NaSO3 -> SO2: - In the fourth step, sodium sulfite (Na2SO3) decomposes to form sulfur dioxide (SO2). - The reaction can be represented as: 2Na2SO3 -> 2Na2O + 3SO2. - This reaction is an example of a decomposition reaction, where a compound breaks down into simpler substances. - The balanced equation for this reaction is: 2Na2SO3 -> 2Na2O + 3SO2.

Please note that the given reaction sequence is a simplified representation, and there may be other intermediate steps or reactions involved in a real-world scenario.

I hope this explanation helps! Let me know if you have any further questions.