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When there is a murder, suspicious fire or hit-and-run accident, police and rescue workers aren't the only ones in on the investigation. Forensic scientists also play an important part. They will take samples collected at the scene and analyze them in a forensics laboratory. With a little ingenuity and some very high-tech equipment, forensic scientists can help law enforcement catch even the wiliest perpetrator. Forensic science is a discipline that applies scientific analysis to the justice system, often to help prove the events of a crime. Forensic scientists analyze and interpret evidence found at the crime scene. That evidence can include blood , saliva, fibers, tire tracks, drugs, alcohol , paint chips and firearm residue.
Crystallization is used to purify a solid. The process requires a suitable solvent.
A suitable solvent is one which readily dissolves the solid solute when the solvent is hot but not when it is cold. The best solvents exhibit a large difference in solubility over a reasonable range of temperatures. Lab Techniques
Use the proper solvent or solvents--test if necessary; a proper solvent will exhibit a big solubility difference over a small temperature range. For example, if you add 5 mL and approx.
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If some of the solid does not dissolve then If insoluble material, you can decant carefully transfer Lab Techniques into another flask leaving the insoluble material behind or filter. For both e and frinse filter paper with a small amount of hot solvent. Decolorization : Most organic compounds are colorless. Highly conjugated compounds eg, polar polymers will absorb light in the visible Lab Techniques of the spectrum and thus be "colored". If these highly polar, large molecules are impurities, they can be removed by use of finely granulated activated charcoal Norit.
DECOLORIZATION
Polar compounds eg, polar impurities adsorb to the charcoal which is insoluble in the solvent and can be filtered away from solution. Unfortunately, some of your compound will also adsorb if there is enough charcoal so the trick is to use just the right amount.
Usually, a very small amount of charcoal will suffice there is a lot of surface to these particles. The Norit is added in small amounts to the hot but not boiling solution until sufficient decolorization has occurred. The Norit can Lab Techniques filtered from the hot solution using fine Lab Techniques paper or a filter aid Celite which is spread on top of the filter paper. To do this, make a slurry of the Celite in any solvent. Wet the filter paper and apply suction to make it stick.
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Now carefully pour the Celite slurry onto the filter paper so it evenly covers it. Then apply the suction. You may discard the solvent from the filter flask or change filter flasks prior to filtering the Norit containing solution. For the Hirsch and Buchner funnels, use a piece Lab Techniques round filter paper which fits the funnel. A proper fit is a piece of paper that just covers the holes but does not touch the sides of the funnel ask for a demo. You will need to use reduced pressure, usually via a water Lab Techniques be certain that the TRAP is clean.]
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