Chemistry Reference
In-Depth Information
Safety Note
please review and follow the safety guidelines at the
beginning of this volume.
Procedure
1. Answer Analysis questions 1 and 2.
2. Label five test tubes 1 through 5. Write the names of the five types
of toothpaste you will be testing on Data Table 1; the numbers on
the data table and the test tubes will correlate with the type of
toothpaste to be tested.
3. Place 1 to 2 ml of toothpaste into each of the designated test
tubes and place the tubes into a test-tube rack. Make notes on the
appearance and texture of each toothpaste on the data table.
4. Test the pH of toothpaste 1 by placing a strip of pH paper into the
test tube (or scooping a small amount out of the tube with a spatula
and testing the small sample). Compare the color of the strip to the
indicator card and record the pH of the solution on the data table
(see Figure 2). Repeat with samples 2 through 5.
indicator card
pH paper
Figure 2
Determine the pH of the substance tested by comparing
the color of the pH paper to the indicator card.
5. Test the fluoride content of toothpaste 1 by placing a fluoride test
strip into the test tube or by testing a small amount on a spatula.
Compare the test strip to the indicator card. Record the fluoride
content on the data table. Repeat with samples 2 through 5.
