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Sulfur dioxide preparation
Accepted Answer
Sulfur dioxide (SO2) can be prepared through various methods, including:
1. Burning sulfur: This is the most common method. Sulfur is burned in air, reacting with oxygen to form sulfur dioxide.
S(s) + O2(g) → SO2(g)
2. Reaction of sulfites with acids: Sulfites, such as sodium sulfite (Na2SO3), react with strong acids, such as hydrochloric acid (HCl), to produce sulfur dioxide, water, and a salt.
Na2SO3(aq) + 2HCl(aq) → SO2(g) + H2O(l) + 2NaCl(aq)
3. Roasting sulfide ores: When sulfide ores, like pyrite (FeS2), are heated in air, they decompose to produce sulfur dioxide and metal oxides.
4FeS2(s) + 11O2(g) → 2Fe2O3(s) + 8SO2(g)
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