QUESTIONS (NOTE: You may have to do some Internet searching for some of t hese a

Question

QUESTIONS (NOTE: You may have to do some Internet searching for some of t hese answers!) d acetone are both polar solvents. This means they have a slight charge, so anything else that has a positive or negative charge on any part of t chromatography, travel further along the paper strip). he molecule will more readily dissolve in them (and, in If a molecule is non-polar (not charged) it will not dissolve in either of these solvents, and so will remain at or very close to the origin 1. Acetone is much less polar than water. Did this make a difference in the chromatograms (results) for the markers that you tested? Why do you think this may be the case? a etone. 2. Some of the markers that you used were water-soluble (and so easier to clean upl). Others were permanent markers. Did this make a difference in how they behaved in each of the solvents? What would that mean for cleaning up? na, it di+ have to atter because olvent 3. Could this techniques be used in forensics-at a crime scene, in analysis of a historical document, o other investigation? How might it be used? The Could tind Hinger Prints, also ticy l tnl the orisin of the lnk. Sub stance on han ds Internet or other sources used to answer the questions:

Explanation / Answer

Ans1)Water can dissolve polar solvents, but it is very weak at dissolving polar solvents. Further, the solvent must be able to travel up the paper to allow separation of pigments. The further up the paper a solvent can travel, the greater amount of resolution can be achieved. Therefore, polar solvents, especially water, travel more slowly and allow less resolution between pigments. Acetone gives a great middle ground for this rule because it is amphipathic. An amphipathic substance has both a polar end and a nonpolar end. Viewing at the structure of acetone, you can understand that it has a notable partial negative charge on the oxygen atom, a small positive charge on the carbonyl carbon, and it has two nonpolar alpha-carbons. It is, hence, polar but less polar than water, and it can dissolve nonpolar substances, as well. Its slight polarity allows it to dissolve polar substances, and the fact that it is less polar than water allows greater resolution between pigments on paper.

Ans2)Non-permanent markers are water soluble, but permanent markers are not. When solvents like Acetone are applied, the permanent marker can be removed easily.So it on using acetone, permanent markers can be cleaned.
Ans3) Since blood is polar, marks of blood stains can be removed with solvents like acetone. So other things can be taken into account like fingernails, DNA matching, fingerprints, the presence of any chemical in hand and shoes.

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