Question

Hi guys! Are any of you familiar with the Hydrogen Gas Collection lab where you measure the molar volume of H2 gas from the reaction of Mg metal w/ HCl?

Answer 1

Materials and Apparatus:

100 mL graduated cylinder 400 mL beaker (filled to 300 mL mark with distilled water)
ring stand one-hole stopper (fitted for gas tube)
utility clamp 1000 mL beaker (filled with tap water)
thermometer 10 mL graduated cylinder
barometer magnesium ribbon
safety goggles cotton thread
3.00 M HCl 100 mL beaker (filled with distilled water)

I don't understand these parts:

1) Measure and record the current room temperature and barometric pressure in the data table.
2) Mass a small piece of magnesium ribbon and record this mass in the data table.
3) Obtain a piece of thread about 15 cm long. Tie one end of the thread around the piece of magnesium ribbon, leaving about 10 cm of thread free. Bend the ribbon so that it will easily fit into the graduated cylinder.
4) Obtain about 10 mL of 3.00 M HCl. Carefully pour the HCl into the 100-mL graduated cylinder.
5) Tilt the graduated cylinder slightly. Using the 100 mL beaker of water, slowly fill the gas-measuring graduated cylinder with water. Try to avoid mixing the acid and water as much as possible.
6) Lower the piece of magnesium ribbon 4 or 5 cm into the graduated cylinder. Drape the thread over the edge of the tube and insert the one-hole stopper into the cylinder to hold the thread in place.