Reaction of Magnesium with Hydrochloric Acid
To develop a method for measuring the volume of gas generated in a reaction between Mg and HCl.
To develop a relationship between the mass of magnesium reacted and the volume of hydrogen generated.
To acquire an understanding of limiting reactants.
|plastic bin||rubber hose||glass bend||1.0 M HCl|
|100 mL graduated cylinder||test tube (25 x 200 mm)||5.00 mL pipet||0.5 g Mg ribbon|
|ringstand and clamp||1-hole rubber stopper||pipet filler||tap water|
Avoid skin contact with hydrochloric acid. Wear goggles at all times. Rinse skin thoroughly if contact is made. Hydrogen gas is flammable.
You will work in groups of 3-4, assigned at random or by the professor. One member of the group will be assigned as a project manager; one as a computer operator; one or two as a laboratory technician. See the group work page for more information.
Design an apparatus that will enable you to collect and measure the volume of hydrogen gas generated using only materials found in the list above. To facilitate speedy collection of data, your group may choose to set up two separate sets of equipment. Check your system(s) for leaks or cracks. React eight different masses of magnesium in the range of 0.01 g to 0.10 g with exactly 5.00 mL of 1.0 M HCl in eight separate trials. To the extent possible, try to spread the masses of magnesium evenly over the entire range 0.01 g to 0.1 g. Use an analytical balance to record the masses. For each trial, collect the hydrogen gas until there is no more than one bubble produced per minute, then record the mass of Mg you used and the volume of hydrogen generated, and make a note if any magnesium metal remains. Repeat any suspicious trials
Guidelines for Writing Laboratory
The laboratory report for this experiment will be a group report. All members of the group should contribute in some way to the writing of the report. You will need to include a title, a detailed procedure, results, discussion and conclusion, and references. After the references, also include the answers to questions 4 and 6 above. The answers to the other questions should be incorporated into your results or discussion, as appropriate.
As this is a group report, please include a table at the end showing the percent contribution of each group member on the entire lab, including the report.
Follow your instructor's directions for submitting the lab report. You may be allowed to submit this report by paper, by the D2L dropbox, or by email (using a filename convention of Lastname1 Lastname2 Etc Limiting and a subject line in your email of "Chem 1061: Limiting Reactant Lab").