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Copy of Candy Chromatography
Transcript of Copy of Candy Chromatography
The dyes will spread out into different colors and rates depending on the M&M color.
What is chromatography? It’s a technique used to separate the various components in a mixture or solution. It works because the components of the mixture will differ in how much they stick to things or to each other and other substances.
Chromatography can be used to separate mixtures , based on molecular size or other chemical properties.
It can also be used to identify chemicals, for example crime scene samples like blood, drugs. Why is it used? Types of chromatography Paper Chromatography Paper Chromatography is a technique that involves placing a small dot or line of the sample solution onto a strip of chromatography paper. The paper is placed in a jar containing a small amount of solvent and sealed. As the solvent rises up and touches the paper the sample mixture rises up with the solvent. And therefore separates. Candy Chromatography Experiment Materials
• M&M or Skittles candies (1 of each color)
• Coffee filter paper
• A tall glass
• Table salt
• A pencil(a pen or marker is not good for this experiment)
• A ruler
• 6 toothpicks
• Aluminum foil
• An empty 2 liter bottle with cap Steps Cut your coffee filter paper into an 8cm x 8cm square. Draw 6 equally spaced dots with your pencil on the paper. Label each dot with a color name. E.g. Y for yellow, B for blue.
Next cut your aluminum foil 8 inch by 4 inch. Place 6 drops of water equally spaced on the aluminum foil. Then place color of candy in each of the drops. Wait for the color to come off the M&M and dissolve in the water. Remove the candy after. Next, take your toothpick and dampen one of them in one of the colors. Lightly touch the toothpick to its dot in the coffee filter paper. Repeat for each color Do this three times, each time waiting for the dots to dry. Then fold your coffee filter paper in an upright position When you finish that, take your empty liter bottle and make a salt solution. Do this by adding 3 cups of water and 1/8th a teaspoon of salt. Close cap and shake until the salt dissolves. Next, pour some of the salt solution in the glass, about a quarter of an inch. Then put the coffee filter paper in the solution. The dots shouldn’t be touching the water. Watch your results. What you should have seen? If you did everything correctly, you should have seen the salt solution climb up the coffee filter paper. It moves through the paper by a process called capillary action. As the solution climbs the paper and touches the dots, you will see the colors expanding into different colors and dyes. Why did this happen? This was an example of common paper chromatography. By using the solvent you were able to separate the many different colors in the M&M candies. The coffee filter paper was thin enough to show the separation of the dyes. Congratulations, you have just witnessed live chromatography.
Hazem El-Hammamy Islam Riad Mohamed
Lotfy Supervised By
Grade 11-C Conclusion The salt climbs up the filter paper, through a process called capillary action.
As the solution climbs up the filter paper. The color spots climb up the paper along with the salt solution, and some colors start to separate into different bands.
The dyes separate because some dyes stick more to the paper while other dyes are more soluble in the salt solution. These differences will lead to the dyes ending up at different heights on the paper