Uploaded October 2019 | Updated September 2026, 2 weeks ago
The molar volume of hydrogen gas is determined in this experiment. A small length of Mg ribbon is held in place using wire in a 1-hole rubber stopper. The stopper is fixed onto a eudiometer that has 6 M HCl (red) at the bottom and tap water filled to the brim. When the eudiometer is inverted the HCl slowly (at first) mixes with the water leading to progressively faster reaction with the Mg until the reaction is completed. The amount of hydrogen gas can then be calculated.
Errors: There are a few errors here worth noting. The level in the tube should be at the water level in the beaker. This can be done by transferring the eudiometer to a bucket or other larger water container. The pressure of the steam in the eudiometer should also be considered and can be determined by looking up a chart of vapor pressures at the measured temperature.
The molar volume of hydrogen gas is determined in this experiment. A small length of Mg ribbon is held in place using wire in a 1-hole rubber stopper. The stopper is fixed onto a eudiometer that has 6 M HCl (red) at the bottom and tap water filled to the brim. When the eudiometer is inverted the HCl slowly (at first) mixes with the water leading to progressively faster reaction with the Mg until the reaction is completed. The amount of hydrogen gas can then be calculated.
Errors: There are a few errors here worth noting. The level in the tube should be at the water level in the beaker. This can be done by transferring the eudiometer to a bucket or other larger water container. The pressure of the steam in the eudiometer should also be considered and can be determined by looking up a chart of vapor pressures at the measured temperature.
