Complete Single Replacement Reaction Stoichiometry Q PDF

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Single Replacement Reaction Stoichiometry

Jonathan Silva

10/22/2020

1

Data Activity 1 1. Write the balanced equation for the reaction of aluminum with copper(II)

sulfate solution. 2AI(s)+3CuSO4(aq) —> 3Cu(s)+AI2((SO4)3(aq) 2. What is the mole ratio of the reactants to one another and what is the mole ratio of Al metal to Cu Metal? 2:3 3.

How many moles of aluminum will be required to produce 0.45 moles of copper metal? 2*0.45/3=0.3 moles of AI

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

metal? 2*27/3*63.5=0.283 5. Based on the information in the procedure, why does the copper metal have

to be completely dry before the yield is calculated? The mass of the liquid is not included with the measurement.

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2

Data Table 1 Balanced Chemical Equation: Answer

Show Your Work

Volume of 1 M CuSO4

100.0mL

Measured with a cylinder

Mass of Al foil

1.56g

Weighed

Moles CuSO4

0.1 moles

moles=Molarity*Volume

Moles of Al

0.0578

Mol= mass/molarmass

Moles Cu Product based on Starting CuSO4

63.55

Moles Cu Product based on Starting Al

1.52

Limiting Reactant

AI

Theoretical Yield of Cu in Moles

1mol/cu

Theoretical Yield of Cu in grams

6.35g

Actual Yield of Cu in grams

6.76g

Percent Yield of Cu

72%

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3 6. Describe the appearance of the copper(II) sulfate solution and the aluminum foil before the reaction starts. It was a bright clear blue liquid, like the blue gatorade drinks but the aluminum foil was a shining piece of silver. 7. Describe your observations of the solution during the reaction. It began to become hot and started smoking as I was stirring it. 8. Describe the appearance of the solution and any solids after the reaction. It became sand at the bottom of the beaker. 9. Describe the appearance of the solid after it is dried. A Brown copper color 10. Was all of the copper(II) sulfate reacted in this lab? Explain your answer both with observations and calculations. 11. Identify the excess and limiting reactants. CuSo4 was the excess reactant and the AI was the limiting 12. Identify TWO aqueous substances that were washed away from the final solid. CuSo4 and AI2(So4)3 are both aqueous solutions 13. If the solids were not washed before drying, how would this change the copper metal yield? The impurities can mix with the copper and increase the weight 14. If the copper is not completely dried, how would this change the yield of copper metal? 15. Explain why the percent yield was not 100%. What are some sources of error?

It could have been that the sample was not fully dried up and still contained some water.

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