Question

@wolfe8

Answer 1

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 clearly 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 Df (in cm) for the solvent. Measure the Ds (in cm) for each color that you see on the coffee filter (there may not be three). Calculate the Rf 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
Solvent: water Df Colors Ds Rf Df Colors Ds Rf Df Colors Ds Rf





Solvent: isopropyl alcohol (rubbing alcohol) Df Colors Ds Rf Df Colors Ds Rf Df Colors Ds Rf

Answer 2

So you just need to get coffee filters and rubbing alcohol from the store.