Lab 11: Signs of Chemical Reactions

LAB 11: Signs of Chemical Reactions,

Balancing and Types of Reactions

Materials:

Vinegar (acetic acid), barium chloride, sodium sulfate, copper sulfate, iron filings, calcium carbonate, 4 test tubes, scoopula,  a spot plate. Pipettes 1 mL, 5 mL

Procedure:

1. CAUTION :   Barium chloride and copper sulfate are poisons.  No food or drinks are permitted in the lab.  This includes gum, water, etc.   Wash/clean spills immediately and report them to the teacher.   Goggles must be worn.

2.  PART A : Get four test tubes and rinse them out.    Label the tube in pencil on the frosting, BaCl2. Using a pippeter to measure,  fill one test tube  with approximately 1 mL of barium chloride solution.   

3.Using a pipeter to measure, Fill a second test tube  with approximately 1 mL Sodium sulfate solution.  Label the tube , Na2SO4

4. Before mixing them, Make an observation of each tube and record it in the results section.

5. Pour the barium chloride into the sodium sulfate. Make an observation and record it in the results.

6. Let the test tube sit in your rack for ten minutes and then make another observation and record it.

7. Clean Up: Pour the contents in the sink, rinse with water.

PART B : Using a pippeter,  Fill a test tube with approximately 1 mL copper sulfate solution.  Label the tube CuSO4.     Before mixing,     Make an observation and record it in results.

8. Obtain a small amount of iron filings,  measure   

1g , in a tray or spot plate.   Make and record an observation of them.

9. Pour the iron filings into the copper sulfate in the test tube.  Place the test tube in your rack. After ten minutes, make and record an observation of this tube.

10. Special Clean Up : Pour the copper sulfate into a beaker , decanting the copper sulfate off of the iron, and pour the iron filings onto a white tray or paper. Make and record an observation. 

11. The iron filings can go into the trash.

12. The copper sulfate goes into the beaker labeled "Liquid Waste"       

13. PART C : Use your 10 mL graduated cylinder to measure,  Fill a test tube with 2 mL of (vinegar) acetic acid, CH3COOH.  Label it "Acid"

14. Obtain a small amount ( TWO "rocks") of calcium carbonate , CaCO3  (solid) in a spot plate. Make and record an observation .

15. Use a scoopula to add the calcium carbonate to the test tube with the acetic acid.

16. Make and record an observation. Let the test tube sit for ten minutes. Make an additional observation. 

17. Clean Up: Decant the liquid into the sink.  Dump the rocks into the regular trash. ( NOT into the sink.)

Results and Observations: 

Your lab report should be hand-written.  Create your own data tables.

Here is a sample data table : Doc

Questions:

1. (From Part A) Describe the reaction of  barium chloride and sodium sulfate.  Use sentences and descriptive terms .

2. Write the balanced chemical equation for this reaction .

3. What type of reaction is this?

4. WEB : What is a use for each product in this reaction?

5. What sign indicated that a chemical reaction occurred?

6. ( From Part B)  Describe the reaction of copper sulfate and the iron filings , Fe+2.

7. Write the balanced chemical equation for this reaction.

8. What type of reaction is this?

9. What sign indicated that a chemical reaction has occurred?

10. (From Part C) Describe the reaction of calcium carbonate and acetic acid.

11. Write the balance equation for this reaction.

12. What type of reaction is it?

13. WEB : What is the common name for acetic acid?  What familiar items contain calcium carbonate?

14. What sign indicated that a chemical reaction occurred?