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580338_Replacement Reaction Stoichiometry_Q(1).docx

Single Replacement Reaction Stoichiometry and Percent Yield

Pre-laboratory Question

1. Write the balanced equation for the reaction of aluminum with copper(II) sulfate solution.

2. What is the mole ratio of the reactants to one another and what is the mole ratio of Al metal to Cu Metal?

3. How many moles of aluminum will be required to produce 0.45 moles of copper metal?

4. How many grams of aluminum will be required to produce 4.5 g of copper metal?

5. Based on the information in the procedure, why does the copper metal have to be completely dry before the yield is calculated?

Laboratory Questions

1. Describe the appearance of the copper(II) sulfate solution and the aluminum foil before the reaction starts.

2. Describe your observations of the solution during the reaction.

3. Describe the appearance of the solution and any solids after the reaction.

4. Describe the appearance of the solid after it is dried.

5. Was all of the copper(II) sulfate reacted in this lab? Explain your answer both with observations and calculations.

6. Identify the excess and limiting reactants.

7. Identify two aqueous substances that were washed away from the final solid.

8. If the solids were not washed before drying, how would this change the copper metal yield?

9. If the copper is not completely dried, how would this change the yield of copper metal?

10. Explain why the percent yield was not 100%. What are some sources of error?

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