Electroplating Metals

For our final lesson of Unit 1, the concept of electroplating metals was introduced by watching a short video featuring a garage-style setup with a guy who uses a spork and pickle juice to electroplate a part of his cart project:

After the video, we reviewed the Lesson 27 PowerPoint slide deck.  When we arrived at slide 7, students practiced the math skill of cross-multiplication to calculate how much of the materials in a 1.5 L stock solution are in a 200 mL sample of the stock solution.  Notes are provided below:

Students then received the Lesson 27 Worksheet and we worked through the front side, serving as the pre-lab for tomorrow.  An example of the marked up worksheet is shown below:


Update: 11/15 – We will be spending the day in the lab.  Students will work in groups of four, using the Electroplating Handout and the materials provided (1.5 V D-cell battery, battery holder, two aligator clips, beaker with 200 mL electroplating solution, and two nickels) to set up and conduct the lab.  Students who complete the lab efficiently will have the opportunity to extend their learning by modifying aspects of the lab using various teacher-supplied materials.

IMG_0105
Results of copper-plating nickel using a solution of copper sulfate, hydrochloric acid, and sulfuric acid in water. Both nickel balls were connected to 9V battery and immersed in CuSO4 solution. Nickel ball connected to negative battery terminal had bubbles form on exterior, then became copper-coated over time. Nickel ball connected to positive terminal did not appear changed.

Update: 11/16 – To complete Lesson 27, students were challenged to complete the task outlined below, with a group lab report (due tomorrow) documenting the experience and explaining the learning:

IMG_0106
Copper coil connected to negative 9-volt battery terminal became partially zinc-coated (zinc connected to positive terminal) when immersed in acetic acid (vinegar) for 5 minutes.  Copper coil bubbled while zinc appeared unchanged during the experiment.

Homework for this week:

  • Read Lesson 27 in the textbook.  Login via hs.saplinglearning.com and enter your username and password:
    • Username: wahps****s-####### (**** = first 4 letters of your last name and ####### = student number).  Remember to include the dash between s and #.
    • Password: S-####### (the S must be capitalized)
  • Work through the homework problems at the end of Lesson 27 and then verify accuracy with the Lesson 27 Homework Answers.
  • Write notes for Lesson 27 on the Chapter 5 Notes handout.
  • Come to class tomorrow prepared to ask questions about anything from Lesson 27 you do not yet fully understand.
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