The chromatography lab follows the scientific method by having a control (the FDC dye), conducting multiple test for more precise data, and used different solvents to compare solubility of the dyes with each. From the nature of this lab we can assume that the dyes as well as the sovlents were all polar, because likes dissolve likes and NaCl is a polar molecule as it’s dissociated into ions. The qualitative data in this experiment would be that the separation of dyes into individual solutions from the original mixture. The quantitative date in this experiment is present through how far the dye moved compared to the solvent and the solvent front, and this can all be measured with a ruler. Here is a particle diagram to illustrate the dissociation process between the dye and the solvent.IMG_0389.JPG

This lab was strictly all physical changes because the action performed in this lab was dissolving which is a type of physical change. There could however be thought to be a chemical change because the dyes change colors, but in reality it is a physical change as the dyes never changed colors they were only separated into their original components from the mixture. This does strengthen our understanding of matter classification and separation techniques by showing the dye solutions were a homogeneous solution and that homogeneous solutions can be separated through dissociation.




About chriscatanach

I enjoy long walks on the beach and watching the sun set. I am in a long term relationship with math and science. The movies are what I consider a man-made heaven. Most of all I think my self out to be the fictional reincarnation of Jay Gatsby.
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2 Responses to Chromatography

  1. Miss Gardner says:

    If all the dyes were polar, then there would be no difference between the chromatograms of the NaCl and the alcohol. Wasn’t there a difference? How should this evidence modify your statement “From the nature of this lab we can assume that the dyes as well as the sovlents were all polar….”?

  2. As a correction I should have said that all the dyes and solvents where polar to a degree. This can be observed when we see that on the alcohol almost all dyes travel up the paper but some dyes travel farther then others, as compared to the NaCl solution few all dyes traveled up the paper to an extent but only a few traveled up to the solvent front. This is because the NaCl solution was completely polar and interacted with all dyes being able to dissolve all showing that all dyes had polar components,but only a few traveled all the way to the solvent front. Isopropel alcohol is also polar while being non-polar. The polar comes from the hydroxide anion OH(-1) found within the alcohol, and the rest of the chemical structure is non-polar. All dyes travel up at least halfway with the alcohol this is because the alcohol is able to react to both polar and non-polar dyes dissolving both. I will not discuss chromatography solution as it did not interact with the dyes. But I hope my correction helped answer your questions.

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