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Solute To Dye Synthesis Lab Report

940 Words4 Pages

Fiona Young Ha Hoang and Joey Lu 12/11/15 Malik AP Chem 4th Prepare to Dye Introduction Chromatography is the separation of a mixture or substance by putting it in a solute with chromatography paper. Following with this lab, we take 3 colors of food dye (red, yellow, and blue) and test which solvent out of distilled water, acetone, ethanol, and 2-propanal would separate the molecules in the dyes the best. Prelab Part I The water creeps up the paper due to the adhesive and cohesive intermolecular bondings and forces, and also due to capillary action. The cornstarch polymer is bigger in size than the sodium bitartrate and sodium bicarbonate, which have a Na atom. All three structures are polar and have Hydrogen bonding. You could use the …show more content…

The Rf value describes the strength of the intermolecular bonds between the solute and the solvent. If the molecule had a very high affinity for the stationary phase it would make the Rf smaller, because it does not want to travel as far. The more time that it takes to travel, the larger the mobile phase is. The mobile phase describes how fast the molecule travel in chromatography. If you combine a polar solvent with a molecule that has a carbonyl group it would have a high Rf. The Rf would be bigger because there would be a larger intermolecular bonding. Purpose The purpose in this lab is to find out the chemical reactions surrounding a solvent in chromatography paper, and to see which solvent works best to separate the molecules in food …show more content…

The separation of the ink for us was very little because we did not have enough time to let the solvent travel completely. The choice of our solvents could be connected to the separation process by having some solvents been able to better separate a substance than others because they have similar polarity. The molecules interacted with the mobile phase, because they got pulled up the chromatography paper using the solute. . The solvent with the best green chemistry rating is water, because out of all the solvents, water creates the least lasting footprint on Earth and it also just has a simple hydrogen bonding. Water spent the most time in stationary phase because water is polar, and also because polar molecules tend to spend more time on the stationary phase than the less polar molecules. See “Data/Results/Observations” and “Analysis/Conclusion” above. Argumentation and Documentation The intermolecular forces and molecular structure of the molecules being separated determine the ideal solvent to use in chromatographic separation making sure that they each have the same

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