What is an ink Done? - Chromatography
Using the technique of chromatography to separate the components of a commercial ink
Chromatography Experiments For Kids Theoretical Basis:
Biologists, physicians and chemists often need to separate the components of a mixture as a prelude to their identification. Chromatography is a technique of separation of substances based on the different speeds at which it moves each, through a porous medium, washed by a solvent in motion. We will apply this technique to separate the pigments used in a commercial ink.
Materials needed for chromatography experiment for kids:
• A strip of filter paper or porous (you can use the role of the fi lter a coffee or end cut-out of ink, a sheet of paper)
• Markers or pens of different colors
• A glass
• A little alcohol
1. Cut a strip of porous paper having a 4 cm wide and a height slightly higher than the glass.
2. Wrap one end of a pen (you can fix it with duct tape) so that the other end reaches the bottom of the glass.
3. Paint a black spot with a marker at the free end of the strip, about 2 cm from the edge. Try to be intense, but that does not occupy much space.
4. In the bottom of the glass, pour alcohol to a height of about 1 cm.
5. Place the strip inside the vessel so that the end is submerged in alcohol, but the stain out of it.
6. You can cover the glass to prevent the alcohol to evaporate.
7. See what happens: As the alcohol goes up along the strip, it drags the different pigments containing the ink stain. Since not all are drawn with the same speed, after a while are colored stripes.
8. Repeat the test using water instead of alcohol.
9. Again, but now uses a strip of notebook paper and alcohol. If desired, repeat the experiment using different colors of ink, so discover their component pigments.
Chromatography Experiments For Kids Verification:
• How many colors can count spots along the strip of paper?
• What happens if you use water instead of alcohol?
• What happens if you use a strip of paper in your notebook?
The inkblot is separated into its components because the color we see is the result of a mixture of different pigments, which were separated by chromatography technique.
Because water is a solvent ink does not separate the different pigments as does alcohol. Similarly, the sheet of notebook paper, not being a porous material that alcohol is not conducive to drag the different pigments in the ink. We hope that you are being home experiments like these