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Abstract

Protocol

Representative Results

Materials

Chemistry

Electrolytic Cells

Published: Not Published

  1. Preparation of the Laboratory

    Here, we show the laboratory preparation for 10 students working in pairs, with some excess. Please adjust quantities as needed.

    • Put on a lab coat, splash-proof safety glasses, and nitrile gloves. You'll prepare a concentrated solution of copper sulfate in sulfuric acid, which must be prepared in a fume hood. Be sure to keep plenty of baking soda available in order to neutralize spills.
    • Make 6 L of copper sulfate in sulfuric acid solution. Place a large magnetic stir bar inside a 6-L Erlenmeyer flask. Set the flask on the stir plate, but don't turn on the stir setting yet.
    • Carefully, pour approximately 250 mL of sulfuric acid into a 400-mL beaker.
    • Use a graduated cylinder to measure 250 mL of sulfuric acid and transfer it to the flask.
    • Measure 5 L of very hot tap water and transfer it to the flask as well. Be aware that the solution will get very hot.
    • Turn on the stir setting and let the solution mix.
    • Weigh 2.2 kg of copper sulfate and add it incrementally to the flask, allowing each addition to dissolve before adding the next.
    • Once the copper sulfate has dissolved, add another liter of hot tap water to the flask.
    • As the solution is stirring, obtain a 10-L carboy and label it as 'Concentrated CuSO4’.
    • Carefully transfer the homogeneous solution from the flask into the carboy. Rinse the flask with 2 more liters of hot water and pour the solution into the carboy.
    • Store the capped carboy in a corrosives cabinet until you are ready to begin the lab.
    • Each group will need 50 mL of acetone, so be sure to have enough for all groups. Note: Acetone is highly flammable; therefore, it should be stored in a flammables cabinet until the lab class.
    • Each group will need a 1 x 9 cm strip of copper sheet. The copper sheet is already pre-cut, so count out the number of strips needed--one for each group.
    • Obtain a roll of 18-gauge copper wire and cut it into 3-in long pieces. Each group will need one piece, so cut as many as is needed.
    • Cut a sheet of emery paper into 1 by 2-inch pieces. Each group will also need one 10-ohm resistor, so set out a container of those in a common area along with the copper sheet, copper wire, and emery paper.
    • Provide a labeled 20-L container in the hood for organic waste.
    • Set out the following equipment and glassware at each lab station (suggested that students work in pairs):
       1    Stir plate
       2    Disposable pipettes
       1    Stir bar
       1    Current probe and data acquisition system
       1    Flash drive
       2    50-mL beaker
       1    250-mL beaker
       1    Watch glass
       1    1.5-V battery
       3    Electrical wires with alligator clips
       1    Brass key

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What is the fundamental chemical reaction in electrochemistry?

The fundamental reaction in electrochemistry is the redox, reduction-oxidation, reaction. The oxidizing agent gains electrons in the reduction half-reaction while the reducing agent loses electrons in the oxidation half-reaction.

What are the major components in an electrolytic cell?

An electrolytic cell is composed of a reaction chamber contain.......

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  • Stir plate
    5
  • Disposable pipette
    10
  • Stir bar
    5
  • Current probe
    5
  • Data acquisition system
    5
  • Flash drive
    5
  • 250-ml beaker
    5
  • 50-ml beaker
    10
  • Watch glass
    5
  • 1.5 V battery
    5
  • 12 in electrical wire with alligator clips on each end
    15
  • Brass key
    5
  • 125 mL squeeze bottle of DI water
    5
  • 10-ohm resistor
    5
  • Emery paper (1 in x 2 in)
    5
  • 18-gauge copper wire (3-in pieces)
    5
  • Copper Sheet (1 cm x 9 cm)
    5
  • Weighing boats
    10
  • Acetone
    300 mL
  • Copper sulfate
    3 kg
  • Concentrated sulfuric acid
    300 mL
  • 400-mL beaker
    3
  • 6-L Erlenmeyer flask
    1
  • Large magnetic stir bar
    1
  • Stir plate
    1
  • 250-mL graduated cylinder
    1
  • 2-L graduated cylinder
    1
  • Top loading balance
    1
  • Analytical balance
    Dependent on lab size
  • Large powder funnel
    1
  • 10-L carboy
    1
  • Wire cutter
    1
  • Scissors
    1
  • Baking soda
    1 kg

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