MHS AP Chemistry
Activities of Mn & Cu
  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.
Data
Results
(label)
initial mass of clean manganese  __________ 
_____
final mass of manganese
__________
_____
mass of manganese lost
 __________ 
 _____ 
moles of manganese lost
__________
_____
mass of filter paper
__________
_____
mass of filter paper + copper
__________
_____
mass of copper produced
__________
_____
moles of copper produced
__________
_____
mole ratio of Cu:Mn (whole number)
__________

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.
 

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