Reference no: EM132554032

1. Obtain three galvanized washers. Using the supplied ruler, measure and record (in tabular form into your lab notebook) the dimensions of each washer (pictures are a great idea here). Record the mass of each washer using the analytical balance. Record a physical description of each washer.

Be sure you have a way to tell which washer has which mass as you proceed with the experiment.

2. Make sure the reactions are performed in the fume hood. Place about 10 mL of 3 M hydrochloric acid in a small beaker. Place one washer in the acid and let it react for about 5 minutes (until the vigorous bubbling stops). Continually swirl the beaker during the reaction. Using forceps, carefully remove the washer, rinse with distilled water, and make sure it is completely dry. Record the new mass of the washer in your table. Using the ruler, re-measure the thickness and the diameter of each washer. Is there a measureable difference?

3. Dispose of the reaction mixture by pouring the used material into the unwanted materials container in the center fume hood.

4. Repeat Steps 2 and 3 with your other two washers.

5. Dispose of your washers in the beaker labeled "used washers."

1. Would these procedural changes cause the calculated thickness of the zinc coating to be higher, lower, or the same as the "actual" thickness? Briefly explain.