| General | |
|---|---|
| Name | Sulfur dioxide |
| Chemical formula | SO2 |
| Appearance | Colourless gas |
| Physical | |
| Formula weight | 64.1 amu |
| Melting point | 198 K (-75 °C) |
| Boiling point | 263 K (-10 °C) |
| Density | 1.4 ×103 kg/m3 (liquid) |
| Solubility | 9.4 g in 100g water |
| Thermochemistry | |
| ΔfH |
-296.84 kJ/mol |
| ΔfH |
? kJ/mol |
| ΔfH |
? kJ/mol |
| S |
248.21 J/mol·K |
| S |
? J/mol·K |
| S |
? J/mol·K |
| Safety | |
| Ingestion | Relatively low toxicity, may cause nausea and vomiting. Long term hazards known. |
| Inhalation | Extreme irritation. |
| Skin | Hazardous when cryogenic or compressed. |
| Eyes | Hazardous when cryogenic or compressed. |
| More info | Hazardous Chemical Database (http://ull.chemistry.uakron.edu/erd/chemicals/8/7111.html) |
| SI units were used where possible. Unless otherwise stated, standard conditions were used. | |
It is produced by volcanoes and in various industrial processes. In particular, poor-quality coal and petroleum contains sulfur compounds, and generates sulfur dioxide when burned: the gas reacts with water and atmospheric oxygen to form sulfuric acid (H2SO4) - and thus Acid rain.
Sulfur dioxide is frequently used as a food additive: particularly as a preservative in alcoholic drinks.
Common misspelling and questions (FAQ)
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