Ink Chromotography

Topics: Color, Cotton swab, Water Pages: 2 (519 words) Published: May 2, 2013
Ink chromatography
items needed:
M&Ms® (4 different colors)
Rubbing alcohol
Coffee filters (2)
plastic cups (2)
paper plate
Table salt
cotton swabs (4)
Measuring cups/spoons
2-liter bottle
Coffee filters usually are round, but it's easier to compare your results if the paper is rectangular. So your first task is to cut the coffee filter into a rectangle measuring three cm by nine cm. You will need two of these strips to complete the lab.

Space four drops of water (or however many colors you are testing) equally distant on a piece of foil or plate. Position one candy of each color on the drops. Give the color about a minute to come off into the water. Dispose of the candy.

Using a pencil draw a line one cm from the edge of one end of one strip of paper. Make four pencil dots (one for each color of candy you will be examining) along this line, about 0.5 cm apart. Underneath each dot, label the color of the candy you will test on that spot. You won't have space to write the whole color name, so try abbreviations like B for blue, G for green, etc.

Before you complete the rest of the lab, make a prediction of the components you expect to see from each candy color. Dip a toothpick or cotton swab into one sample of colored water and dab the color onto the pencil dot for that color. Use a clean toothpick for each color. Try to keep each dot as small as possible. Allow the filter paper to dry, and then go back and add more color to each dot, repeating this step a total of three times for each color.

Prepare the salt solution by mixing 1/8 teaspoon of salt and three cups of water in a clean pitcher or 2-liter bottle. Stir or shake the solution until it is dissolved. Pour the salt solution into a clean tall glass so that the liquid level is 1/4 inch

Tape the strip to a pencil and rest the pencil on top of the jar so that the strip hangs into the jar.Have the end of the chromatography strip just touching the...
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