Question

How will you verify the properties of carbon dioxide? 

Answer 1

Methods to verify the properties of carbon dioxide are:

1. By using limewater:
   Step 1: Take some limewater in a test tube.
   Step 2: Take some baking soda in another test tube and add lemon juice to it. Fit the bent tube over it.
   Step 3: Insert its other end into the lime water.
   Observations: We will observe that limewater turns milky as it comes in contact with the released gas in the form of effervescence. When limewater turns milky, it is confirmed that the effervescence released is of carbon dioxide gas.
   The reaction taking place:
   \[\ce{Ca(OH)2 + CO2 -> CaCO3 + H2O }\]
2. Sodium carbonate is formed when carbon dioxide is passed through an aqueous solution of sodium hydroxide.
   The reaction taking place:
   \[\ce{2NaOH + CO2 -> Na2CO3 + H2O}\]
3. Sodium bicarbonate is formed by passing CO₂ through an aqueous solution of sodium carbonate.
   The reaction taking place:
   \[\ce{Na2CO3 + H2O + CO2 -> 2NaHCO3}\]