1. Read all directions first.  Make sure all masses are recorded to the nearest 0.0001g.  Use the analytical balance.
2. Scour a piece of manganese with iron wool until it seems shiny.
3. Determine the mass of the dry manganese.
4. Place the wire in a small beaker.  Add copper sulfate solution to cover manganese.  Observe.
5. Gently rinse the manganese off with a distilled water bottle.  Add more copper sulfate.  Repeat this step three or four times.  Make sure not to lose any of the precipitate.
6. Write your name on a piece of filter paper (in pencil) and record its mass.
7. Collect the precipitate, and rinse it thoroughly.  Set it aside to dry, or use the oven.
8. Dry the manganese and determine its mass.
9. When the filter paper is dry, record it mass.
10. Complete the data table below, including all appropriate labels.  Show ALL calculations on the back of this printout.

Questions

    1.    Which element was reduced?  Write the net reduction reaction.
 
 

    2.    Which element was oxidized?  Write the net oxidation reaction.
 
 

    3.    Write the balanced net reaction.
 
 
 

    4.    Briefly explain why your ratios were not exactly whole number equivalents.
 

[MHS AP Chem page]