The molar volume (in units of litres per mole) is the same for all gases at the same temperature and pressure - Scottish Highers Chemistry - Question 10 - 2018

To measure the molar volume of gases, follow these steps:

1. Setup the Apparatus: Use a gas syringe for accurate measurement of gas volume. Connect the gas syringe to the delivery tube, ensuring it's sealed with a stopper to prevent gas escape.

2. Chemical Reaction: Choose an appropriate reaction where gaseous products are formed. For example, react hydrochloric acid with zinc to produce hydrogen gas: $ext{Zn (s) + 2 HCl (aq) } \rightarrow ext{ ZnCl}_2 (aq) + ext{ H}_2 (g)$

3. Conduct the Experiment: Add hydrochloric acid to the flask and introduce zinc. As the reaction occurs, the hydrogen gas produced will fill the gas syringe.

4. Measure the Volume of Gas Collected: Once the reaction is complete, note the volume of gas that has been displaced in the gas syringe. This value indicates the molar volume.

5. Repeat with Different Gases: To compare molar volumes, repeat the procedure using other gases produced from different reactions, such as reacting sodium carbonate with hydrochloric acid for CO2 or using a cylinder of hydrogen.

By using the same apparatus and conditions, the molar volume of different gases can be effectively compared.