Download the above file into an empty folder in your “My documents” on your harddrive.

1. Right click this zip file andExtract All…
2. To start the application double click exe(Windows) or VLab (if you don’t see the .exe extension). Mac users click the vlab file.
3. An error message will appear, this is normal so just click OK.
4. Click File > Load Homework…
5. Choose Fully Stocked Lab.

You are now ready to begin. You may want to review the Help file to familiarize yourself with this application. You only need to download this lab once as it is used several time in this course.

Instructions for Oxidation States of Manganese Lab

1. Assemble your materials on the workbench:
   • Bottle KMnO₄₍s₎
   • Flask 10 M H₂SO₃₍aq₎
   • Flask 10 M NaOH₍aq₎
   • 4 × Flasks 10 M NaHSO₃₍aq₎
   • 4 × 600 mL beakers
   • Carboy of ddH₂O₍l₎
2. In a 600 mL beaker, create an aqueous solution of 0.01 M KMnO₄₍aq₎(be sure to explain how this is done and show your calculations in the materials and methods section). Right click on the beaker and select rename. Rename it “0.01 M KMnO₄₍aq₎”. Record your observations for this solution.
3. To each of three other 600 mL beakers, add 100 mL of the KMnO₄₍aq₎
4. Label one of the beakers, ‘acidified,’ the second beaker ‘basified,’ and the third beaker ‘control.’
5. Pour 100 mL of the 0.01 M solution of KMnO₄₍aq₎into each of the beakers.
6. To the beaker marked ‘acidified’ add 100 mL of 10 M H₂SO₃₍aq₎and 100 mL of 10 M NaHSO₃₍aq₎ Note the colour of each solution before adding it, and the colour of the final mixture.
7. To the beaker marked ‘basified’ add 100 mL of 10 M NaOH₍aq₎and 10 M NaHSO₃₍aq₎ Note the colour of the original solutions as well as the final mixure.
8. To the beaker marked ‘control’ add 200 mL of 10 M NaHSO₃₍aq₎ Note once again the colour of the original solution and of the final mixture.
9. Record any observations that you think are relevant — qualitative and quantitative – on the concentrations and pH. Remember to use the panel to the side for aqueous species data, and remember to click on “Solid” and note the mass of any solid species that may have evolved.