Chemistry Labs

Copper Lab

Name _________________________

Lab Partner ____________________

Description: You will start off with copper metal and through a series of reactions, you

will observe several copper compounds. In the last reaction, you will return

your copper compound back to copper metal.

Goals: Observe different types of chemical reactions.

To retain as much copper as possible through the reactions

DAY 1

Reaction # 1 Cu + HNO3 NO2 + H2O + Cu(NO3)2

Procedure:

1) Weigh out 1.5 grams of copper. Put into a small beaker (250mL)       Record your value

2) Measure out 20.0 mL of 6 M nitric acid. CAUTION CORROSIVE!!!

3) Put names on a watch glass. Make sure that the watch glass will sit on top of the beaker without falling in.

4) IN THE FUME HOOD, add the nitric acid and cover with the watch glass. Observe.

 

Questions:

1) Balance the above reaction _______________________________________

2) Describe the reaction you observed _______________________________________

_______________________________________

_______________________________________

3) The bubbling is due to which product? 

_______________________________________

_______________________________________

4) Why is the fume hood used? _______________________________________

5) Write out the formula of the copper product made _______________________________________

6) Write out the name of the copper product made _______________________________________

7) My beginning mass of copper is: _________grams.

 

 

 

DAY 2

Reaction #2

We will now take this copper substance and add sodium hydroxide to it. Write out the equation and balance it. It is a double replacement reaction, where the sodium and the copper will exchange places. (Copper stays +2)

______________________________________

Procedure:

1) Test the pH of the solution in your beaker using litmus paper, determine if the solution is basic or acidic.

What is the pH of the sodium hydroxide? _______

2) Put the beaker of copper (II) nitrate in an ice bath (DO NOT ALLOW WATER TO ENTER SOLUTION WITH COPPER)

3) Measure out 20.0 mL of 6 sodium hydroxide.

4) Add sodium hydroxide. Litmus paper should turn basic.

Questions:

1) Describe, qualitatively, the reaction that took place ______________________________________

2) What is the name and formula of the copper product you now have in your beaker? ____________________________

3) Why do you think the ice bath was used? ______________________________________

 

 

 

DAY 3

Reaction #3

1) What is the name and formula of the copper product in you beaker? ______________________________________

2) Today you will decompose your copper compound with heat.

    Which reaction type will this be?         ______________________________________

3) Write out the full equation for the reaction you will be completing today and balance it: 

______________________________________

           

Procedure:

1) Add 100.0 mL of distilled water to the copper substance

2) Heat gently while stirring. The reaction is complete when no more blue is visible. Add more NaOH if it does not turn black after 5 minutes of heating.

3) Decant twice, be careful not to lose any of your copper.

Decanting Procedure: Add approximately 30 - 50 mL of warm distilled water, stir, allow to settle, and then pour off the wash water.

 

Questions:

1) Describe, qualitatively, the reaction that took place: ______________________________________

______________________________________

2) What is the name and formula of the copper product? ______________________________________

3) Describe the appearance of your copper product:             ______________________________________

4) What is the purpose of decanting thoroughly? ______________________________________

 

DAY 4

Reaction #4

1) Today you will add hydrochloric acid to your copper product.

What type of reaction will this be? ______________________________________

2) Write out the complete reaction that you will be completing today and balance it: ______________________________

Procedure:

1) Decant any excess wash water remaining from yesterday.

2) Add 50.0 mL of 6M hydrochloric acid and stir slowly for approximately 2 - 5 minutes.

 

Questions:

1) Qualitatively describe the above reaction ______________________________________

2) What is the name and formula of the new copper compound you have? ______________________________________

3) The copper atoms are present, why are they not visible to you? ______________________________________

 

Reaction #5

1) Now you will add aluminum wire to your copper compound.

What type of reaction will this be? ______________________________________

2) Write out the complete reaction that you will be completing today and balance it: ______________________________

Procedure:

1) Add approximately 1.5 grams of aluminum wire to your copper. Cover your beaker with your watch glass. Do this reaction in the FUME HOOD!

Questions:

1) What is the name and formula of the copper product you have made? ______________________________________

2) Qualitatively, describe the reaction: ______________________________________

 

DAY 5

Reaction #6

Today you will clean the copper you have retrieved

Procedure:

Remove any excess aluminum wire left.

Decant twice with hot, distilled water.

Decant with acetone CAUTION: Do not heat acetone!!!

Weigh a clean watch glass

Record the mass of the watch glass _________________grams.

Transfer all of the copper to the watch glass.

Allow copper to dry overnight in the fume hood.

 

DAY 6

Weigh the watch glass and copper.

Mass of copper retrieved ______________________ grams.

Describe the appearance of your copper ______________________________________

Find the percent error of your retrieval:

Original Copper Mass Observed Copper Mass * 100 = % error

Percent Error is ________%

Questions:

List five errors leading up to copper loss. Explain when and how each error may have occurred.

    ________________________________
    ________________________________
    ________________________________
    ________________________________
    ________________________________

2) How does this lab attempt to illustrate the Law of Conservation of Matter? ________________________________

Chemistry Labs