Objective: The objective is to determine the volume, of one mole of hydrogen gas at STP using experimental data, known mathematical relationships, and a balanced chemical equation.
The goal of this lab is to find the volume of one mole of hydrogen at STP. The experimenters will be working with hydrochloric acid and magnesium to find the objective. The acid in this lab will react to the magnesium and cause the water in the eudiometer to rise because of the reaction. The final volume should be 49.92mL.A Key theory to know for this lab is Avogadro’s hypothesis. This statesthat “equal volumes of gases at the same temperature and pressure contain the same number of molecules regardless of their chemical nature and physical properties. Molar volume is the volume (22.4 L) occupied by a mole of a substance at STP. The chemical equation for this lab is magnesium plus hydrochloric acid yields to hydrogen gas plus magnesium chloride. The combined gas law explains the relationship among the pressure, temperature, and volume of an enclosed gas. Also the combined gas law allows you to do calculations for situations in which only the amount of gas is constant. All of these scientific terms you will have to know to successful perform this lab
Obtain all the materials needed for this lab. (Safety is important, lab involves hydrochloric acid)
Using scissors cut a piece of around 100cm magnesium ribbon
Then with the stopper, attach the piece of Mg onto to the loop of the stopper.
Then, set up the ring stand
Next, fill a 1000mL beaker with 900mL of water and place it on the ring stand.
Then, fill 5mL of 5M HCL and place this into the eudiometer. (Handle with care).
With the eudiometer, slowly fill it with water. Try to avoid mixing the acid and the water.