Determining Gas Volume in Experimental Setup
How can a student determine the volume occupied by a gas in a 125 ml flask?
A student needs to determine the volume occupied by a gas in a 125 ml flask using the experimental setup described in the procedure. The student measures the volume of the flask to be 156 ml to the top of the flask. The student measures the volume of the flask with a stopper in it to be 135 ml. The student performs the experiment by reacting the strip of magnesium with 5 ml of HCl solution. What is the volume of the flask occupied by the hydrogen gas?
Answer:
The volume of the flask occupied by H₂ is 130 mL.
Given the experimental setup where a student measures the volume of a flask to be 156 ml to the top of the flask and 135 ml with a stopper in it, we can calculate the volume of the flask occupied by the hydrogen gas.
Since magnesium reacts with HCl and releases H₂ gas which will occupy the entire volume of the flask, we can determine the volume of the flask occupied by H₂ gas by subtracting the volume of HCl solution used (5 ml) from the volume of the flask with the stopper in it (135 ml).
Therefore, the volume of the flask occupied by H₂ gas is calculated as follows:
Volume occupied by H₂ = Volume with stopper - Volume of HCl solution Volume occupied by H₂ = 135 ml - 5 ml = 130 mlSo, the volume of the flask occupied by the hydrogen gas is 130 ml in this experimental setup.