Laboratory 4

1
Laboratory 4 Stoichiometry of Copper (II)
Chloride and Aluminum

• Purpose Determine the stoichiometry of
• CuCl2 (aq) Al (s) ? AlCl3 (aq) Cu (s)
• Materials Copper (II) chloride solution
• Aluminum (2.5 cm x 2.5 cm), 2 500 mL beakers,
  ring stand, filter paper, balance, thermometer

2
Laboratory 4 Stoichiometry of Copper (II)
Chloride and Aluminum

• Procedure
• Weigh the Al foil. Place 10 mL of the CuCl2
  solution in the one beaker and measure its
  temperature.
• 2. Write you group number and period on the
  filter paper. Weight it and record the mass.
• 3. Lightly crumple the foil and place in the
  beaker. You can push it under the surface with
  the thermometer. Lightly stir with the
  thermometer.

3
Laboratory 4 Stoichiometry of Copper (II)
Chloride and Aluminum

• Procedure (cont)
• 4. Measure the temperature every 30 secs.
• After 5 mins., filter out the solid in the
  beaker. Rinse with tap water to get all the
  solid out of the beaker.
• 6. Place the filter paper in the oven and the
  filtrate in the waste beaker
• 7. Thoroughly rinse the beakers, graduated
  cylinder, and glass funnel with tap water.
• 8. Weigh the filter paper tomorrow.

4
Laboratory 4 Stoichiometry of Copper (II)
Chloride and Aluminum
Observations before the chemical reaction
Mass of Aluminum (g)
Mass of Filter Paper (g)
Temperature after the aluminum is added
Time (min) Temperature (C) Time (min) Temperature (C)
0 2.5
0.5 3.0
1.0 3.5
1.5 4.0
2.0 4.5
Observations after the addition of the aluminum
Solid in the beaker
Liquid in the beaker
Mass of Filter Paper (g) Day 2
5
Laboratory 4 Stoichiometry of Copper (II)
Chloride and Aluminum

• Analysis
• Balance the equation, then use the mass of the
  aluminum to calculate the mass of copper
  theoretically produced. Compare this to the mass
  of copper determined by the experiment.