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difference between SO2 and CO2 test

difference between SO2 and CO2 test

Grade:12th pass

3 Answers

Vasantha Kumari
askIITians Faculty 38 Points
8 years ago

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

Thanks & Regards,

Vasantha Sivaraj,

askIITians faculty

Vasantha Kumari
askIITians Faculty 38 Points
8 years ago

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

Thanks & Regards,

Vasantha Sivaraj,

askIITians faculty
Vasantha Kumari
askIITians Faculty 38 Points
8 years ago

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 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

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