Results
Data
Mass of
Mass of
Mass of
Mass of
iron nails before the reaction
iron nails after the reaction
filter paper
filter paper and copper
_________
_________
_________
_________
Processing the Data
1. Determine the mass of iron that reacted (lost by the nails).
2. Use the mass of iron that reacted to determine the theoretical yield of
copper.
3. Determine the actual mass of copper produced.
4. Determine the percent yield of copper.
5. A. Which reactant is the limiting reagent? What evidence supports this?
B. Use calculations to determine the limiting reagent.
C. Calculate the mass of the excess reagent remaining after the reaction is
over.
6. Determine the number of grams of copper (II) chloride required to react with
all of the iron you put in the beaker (look at the mass of iron that you started
with).
Lab Calculation Question
You have performed the iron and copper (II) chloride experiment again.
Fe + CuCl2 → FeCl2 + Cu
Data
Mass
Mass
Mass
Mass
1.
2.
3.
4.
5.
of
of
of
of
iron nails before the reaction
iron nails after the reaction
filter paper
filter paper and copper
14.26g
11.01g
1.24g
5.13g
Determine the mass of iron that reacted.
Determine the theoretical yield of copper.
Determine the actual yield of copper.
Determine the percent yield of copper.
Determine the limiting reagent (show the calculation) and clearly state the
limiting reagent.
6. Determine the mass of the excess reagent that is left over at the end of the
reaction.
7. Determine the number of grams of copper (II) chloride required to react with all
of the iron.
Discussion
• What was the limiting reagent in this reaction? How did you
know it was limiting? Was one of the reactants left over at the
end of the reaction? Why would it be left over at the end of the
reaction?
• Was the percent yield 100%? (Reasons why % yield is not
100%?)
• Yellow residue on filter paper? What is it and how does it affect
your results?
• Black substance on filter paper? What is it and how does it
affect your results?
• Other errors? What is the error and how does it affect your
results?
Conclusion
• Reflects back to the purpose - state the answer (s)
• How could the experiment be improved if it was repeated?