Question

How to distinguish between carbon dioxide and sulphur dioxide

Answer 1

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difference between SO2 and CO2 test
3 years ago
Answers : (3)










SO2 is a colourless pungent gas which we can test as
follows:


1. Acidic dichromate paper ---orange to green

2. KIO3+ starch solution reagent---SO2 turns filter
paper moistened with KIO3 and starch soln blue.

Lime water reagent SO2 forms white ppt of CaSO3
with lime water.


CO2 being a colourless and odourless gas evolves with
effervescence.


The test reagent for CO2 is lime water or baryta
water.

It forms white turbidity with limewater due to insoluble CaCO3
formation.

Ca(OH)2+CO2 ®¯CaCO3+H2O


SO2 test


CO2 test

Answer 2

SO2 is a colourless pungent gas.
SO2 Test:
1. Acidic dichromate paper ---orange to green

2. KIO3+ starch solution reagent---SO2 turns filter paper moistened with KIO3 and starch solution blue.

Lime water reagent SO2forms white ppt of CaSO3 with lime water.
______________________________
CO2 test:
_______

CO2 being a colourless and odourless gas evolves with effervescence.

The test reagent for CO2 is lime water or baryta water.

It forms white turbidity with limewater due to insoluble CaCO3 formation.

Ca(OH)2+CO2 ®¯CaCO3+H2O