Chemistry Reference
In-Depth Information
8. Add 3 to 4 drops of concentrated sulfuric acid to the test tube and
stir gently.
9. Stopper the test tube and place in the test-tube rack.
Figure 2
To smell the substance in a test tube, wave your hand over
the tube toward your nose.
10. Repeat steps 5 through 10 with test tubes 2, 3, and 4, using the
acids and alcohols listed on Data Table 2.
11. Place all four test tubes in the hot water bath for about 5 minutes
(min).
12. After 5 min, remove the test tubes from the hot water and allow
them to cool for 1 to 2 min in the test tube rack.
13. Remove the stoppers and add 8 to 10 drops of 5 percent baking
soda solution to each test tube to react with the excess acid and
make the scent of the esters more evident.
14. While holding the test tube about 12 in. (30.5 cm) from your face,
gently wave the scent of each test tube toward your nose until you
can smell the ester. (Do not place your nose directly above the test
tube.)
15. Record the scent of each ester in Data Table 2.
Analysis
1. Research the four esters that you chose to create in this lab. Draw
their chemical structures in your science notebook.
2. How were the scents of the
reagents
(acids and alcohols) different
from the scents of the
products
(esters) in this lab?
