procedure:
1. cut 3 strips of coffee filter. be sure that the strips are much narrower
and slightly taller than the drinking glasses.
2. in the center the strips, about 3 cm from one end, place a dot of the
marker to be tested. the dots should be about 0.2 cm in diameter and
dark enough to be dearly visible.
3. place about 2 cm of water in each glass.
4. tape the unmarked end of each strip to the center of a pencil so that
the strip hangs down when the pencil is held horizontally.
5. carefully insert the strips into the glasses, dotted end down. the dot
must be above the water, and the sides of the coffee filters cannot
touch the sides of the glasses.
6. let the setup stand for 20 minutes. follow procedure 8 as your setup
stands.
7. record your observations after 20 minutes in the table below. measure
d in cm) for the solvent. measure the d. (in cm) for each color that
you see on the coffee filter (there may not be three). calculate the r
for each color using the equation in the introduction section.
8. repeat steps 1-7, except place about 2 cm of isopropyl alcohol
(rubbing alcohol) in each glass instead of water.
9. clean up your work area.
data:
marker color
marker color
d.
colors
d
r
d.
colors
solvent:
water
d. r
d
colors
d
r
d. colors
d. rd colors
d, r
d
colors dr
solvent:
isopropyl
alcohol
(rubbing
alcohol)