Testing for Gases
What are the General Tests for Sulfur Dioxide Gas?
1) Sulfur dioxide gas, SO2(g) 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.
What is the 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)
How is Sulfur Dioxide Gas Collected?
Sulfur dioxide gas is more
dense than air
and can be
collected by downward delivery or by using a gas syringe.
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