paulo1913 Posted December 10, 2007 Share Posted December 10, 2007 What is polarity and how is it related to chromatography? Link to comment Share on other sites More sharing options...
Fred56 Posted December 10, 2007 Share Posted December 10, 2007 Chromatography is a rather large discipline in lab work. A simple chromatography example would be putting a spot of ink on a tissue and wetting it -the ink runs as the water 'spreads' along the tissue paper, because the paper 'attracts' it. Water is a polar liquid: it has a slight dipole moment. Look up "dipole moment". Water (H-O-H) has it because electrons tend to stay closer to the heavier oxygen nucleus, and the two protons (hydrogen nuclei) tend to have a slight positive charge. So, a central moment, and two external moments, of charge, a dipole. Lots of chemicals also have -OH groups, ones that don't tend not to mix with ones that do, and so on. And there are a lot more polar 'groups' that organic molecules can have hanging off them. Link to comment Share on other sites More sharing options...
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