Testing for Gases
The Test for Sulfur Dioxide Gas, SO2(g).
1) Sulfur dioxide gas has no colour.
2) Sulfur dioxide gas smells like burnt matches.
dioxide gas turns moist
litmus paper from blue to red
and moist universal indicator paper to red - it is acidic.
4) Sulfur dioxide gas will put out a lit splint.
Specific Test for Sulfur Dioxide Gas.
dioxide gas turns acidified
potassium dichromate(VI) solution from orange to green.
Chromium is reduced from (VI) to (III).
sulfur sulfuric chromium(III) potassium
dichromate(VI) + dioxide + acid sulfate + sulfate + water.
K2Cr2O7(aq) + 3SO2(g) + H2SO4(aq) Cr2(SO4)3(aq) + K2SO4(aq) + H2O(l)
Collecting Sulfur Dioxide Gas.
Sulfur dioxide gas is more
dense than air
be collected by downward delivery or using a gas syringe.
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