Question 21
In pairs, follow the steps in Figure 5.14 to carry out this experiment. Use two different coloured inks: green and black (Figure 5.16). Before the experiment, think about the following: What is the purpose of the experiment?
Figure 5.14 procedure: Use porous paper such as filter paper; a suitable solvent (alcohol or water); the inks; a beaker, stick, pin, pencil and ruler. Draw the starting line on the porous paper using the pencil and ruler. Draw a dot on the starting line using the marker and secure the paper around the stick using the pin. Place the solvent in the beaker. Dip the bottom of the paper into the solvent. The starting line on the paper should be above the level of the solvent. Rest the stick on the beaker. Observe the separation as the solvent travels up the paper.
Caution: Alcohol is flammable, harmful when swallowed, and can cause irritation to the skin and eyes.
Figure 5.14 procedure: Use porous paper such as filter paper; a suitable solvent (alcohol or water); the inks; a beaker, stick, pin, pencil and ruler. Draw the starting line on the porous paper using the pencil and ruler. Draw a dot on the starting line using the marker and secure the paper around the stick using the pin. Place the solvent in the beaker. Dip the bottom of the paper into the solvent. The starting line on the paper should be above the level of the solvent. Rest the stick on the beaker. Observe the separation as the solvent travels up the paper.
Caution: Alcohol is flammable, harmful when swallowed, and can cause irritation to the skin and eyes.
