Burning of Sulfur to Produce Sulfur Dioxide

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Summary

Sulfur is burned in a deflagrating spoon in a flask, forming sulfur dioxide in the synthesis reaction. The 11 thumbnail images summarize the content of the video. Click an image to see the image gallery.

Narration

Water and bromphenol blue indicator are stirred in a flask. Sulfur, an impurity of coal, is burned in a deflagrating spoon. When the spoon is inserted into the flask, sulfur dioxide is formed in the synthesis reaction. The gas dissolves, forming aqueous sulfurous acid. The formation of the acid is indicated by the color change of the solution.

Discussion

A flask contains water and bromphenol blue indicator. A sample of yellow powdered sulfur in a deflagrating spoon is ignited until it burns spontaneously in air with a light blue flame. The burning sulfur is then inserted into the flask. The sulfur reacts with oxygen in the flask to form sulfur dioxide gas, which then dissolves in the water, forming sulfurous acid. The solution turns to a yellow color, indicating the acid formation. As more gas dissolves in solution, the solution becomes more acidic.

S(s) + O2(g) → SO2(g) (exothermic)

SO2(g) + H2O(l) → H2SO3(aq)

Keywords

Acids / Bases | Descriptive Chemistry | Applications of Chemistry | Oxidation / Reduction | Precipitation / Solubility

These ChemEd DL Resource Groups Include This Video

Reactions of Sulfurous Acid
Acid Base Reactions of Sulfur Dioxide
Acid Base Reactions
Reactions in Aqueous Solutions
Atmospheric Pollution
Atmosphere
Properties of Gases


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