Question

how is co2 gas tested in the laboratory​

Answer 1

if the solution of lime water turns milky then we can say that co2 is present

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Answer 2

To show the presence of CO2 in laboratory you have to do the following

1)Take freshly prepared limewater

2) Blow in it

3)You will see that it will convert in milky limewater

The Ca(OH) which is transparent when reacts with CO2 turns into CaCO3 which is opaque.

The Reaction is as follows

$caoh + co {}^{2} = caco {}^{3}$

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