ChemCom Water Purification and Mixture Separation Purpose: - To “purify” a water sample and calculate the percentage of pure water in a mixture. Prelab Notes: The most effective “green” technologies often model systems already in place in nature. The water cycle is nature’s way of “purifying” water. Impure water samples contain suspended matter (large chunks you can see) and dissolved matter (tiny particles you cannot see). Conductivity is used in this lab to measure water’s purity. Pure water does not conduct electricity. The more impurities present, the more a water sample conducts electricity. QuickTime™ and a TIFF (Uncompressed) decompressor are needed to see this picture. Decant – To carefully pour off the top layer of a mixture. Filtrate – The liquid collected after filtration. Clean Glassware is important here!!!