Description: Sulfur dioxide gas is prepared by burning sulfur in a large flask of oxygen, containing a small amount of base and indicator. As the sulfur dioxide dissolves in the water, the indicator changes color.

This demonstration is also available on video and on JCE Software "Chemistry Comes Alive!" Vol. 1 CD-Rom.

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Source: Shakhashiri, B.Z. Chemical Demonstrations: A Handbook for Teachers of Chemistry

Year or vol: 2 page: 184

Keywords: Sulfur Dioxide, Hydrogen Sulfide, Potassium Permanganate, Potassium Dichromate