CHM 100 – Introduction to Chemistry

Experiment # 14 – Chemical Reactions

REVISED INSTRUCTIONS…

Part A2

  This is an instructor DEMO performed under the fume hood.

Part B2

  This is an instructor DEMO.

Part C:  Replacement Reactions

1) Put 1mL of silver nitrate in a clean test tube.  Add a small piece of copper wire (~1cm long).  Allow a few minutes for reaction to occur.  Record your observations.

2) Put 1mL of dilute hydrochloric acid in a clean test tube.  Add a small piece of magnesium ribbon (~1cm long).  Record your observations.

3) Put 1mL of distilled water in a clean test tube.  Holding the test tube with a test tube holder, add 1 (small) piece of calcium metal.  Record your observations.

Part D:  Double Replacement Reactions 

  Instead of using test tubes, use spot plates…

1) To the first well, add 3 drops of silver nitrate.  To the second well, add 3 drops of mercury (II) nitrate.  To the third well, add 3 drops of aluminum nitrate.

2) Add 1 drop of potassium iodide to each of these 3 wells and record your observations.  Clean your spot plate.

3) Repeat step 1.  This time, add 1 drop of sodium phosphate to each of these 3 wells and record your observations.  Clean your spot plate.

Part E:  Neutralization Reactions

1) Obtain 3 test tubes.  Add 10 drops of nitric acid to the first test tube, 10 drops of sulfuric acid to the second, and 10 drops of phosphoric acid to the third. 

2) Add 1 drop of phenolphthalein to each test tube. 

3) With frequent stirring, add sodium hydroxide drop-wise to the first test tube until a permanent pink color change is observed. 

4) Repeat step 3 with the other 2 test tubes.

Part F:  Preparation of Copper from an Unknown Metal

  OMIT this part

*** Please return this sheet to your instructor at the end of the lab. ***

***  Thank you!  ***