Sulfur dioxide
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de:Schwefeldioxid es:Dióxido_de_azufre fr:Dioxyde de soufre nl:Zwaveldioxide ja:二酸化硫黄 sv:Svaveldioxid zh:二氧化硫
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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 |
|
SI units were used where possible. Unless otherwise stated, standard conditions were used. | |
Sulfur dioxide (or Sulphur dioxide) has the chemical formula SO2. The gas is irritating to the lungs and is frequently described as smelling of burning sulphur.
It is produced by volcanoes and in various industrial processes. In particular, poor-quality coal and petroleum contain sulfur compounds, and generate sulfur dioxide when burned: the gas reacts with water and atmospheric oxygen to form sulfurous acid (H2SO3) and thus Acid rain.
Sulfur dioxide is sometimes used as a preservative in alcoholic drinks.
The word equation for the acid rain reaction:
sulfur dioxide + water = hydrogen sulfite
H2SO3 is also called "hydrogen sulfite" or "sulfurous acid".
See also:
External links
- Food Intolerance Network - Sulphite factsheet
