You are solvent if your
[PDF File]Working Safety with Solvents
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The more volatile a solvent is (turns into vapor), the more flammable it is. A solvent with a flashpoint of 100˚ F or less is designated “flammable” and ignites easily. If the flashpoint is more than 100˚ F, the solvent is called “combustible” and is more difficult to ignite. Flashpoint: the lowest temperature at which a solvent gives off
[PDF File]Solvents: Chemical Hazards in the Home
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Don’t wash your hands with solvents unless the con-tainer says you should. Shoes and clothes treated with solvent-containing products should be completely dry before you wear them. Eye Injury Solvent vapors and liquids can severely damage your eyes, particularly if you wear contact lenses. Lung Damage Breathing solvents is hard to avoid ...
[PDF File]Thin layer chromatography TLC
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Typically an effective solvent is one that gives Rf's in the range of 0.3 - 0.7. Note that the spotting solvent is simply used as a vehicle to transfer the material to be analyzed to the TLC plate. Once the transfer is made the spotting solvent evaporates. It has no effect on the separation. It is the development solvent that effects the ...
[PDF File]Laboratory Math II: Solutions and Dilutions
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1 liter with solvent. It is important to note that you do NOT add one liter of solvent to the 375 grams of the substance. The dry substance has a volume as well, and if you add a liter of solvent, your total volume will be greater than one liter and your concentration will be wrong.
[PDF File]Chapter 12: Recrystallization
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If your first choice of solvent is not a good recrystallization solvent, keep trying others. If you cannot find a single solvent that works, try a two solvent system (see section 9.3). B. Factors Other than Solubility to Consider If you find more than one solvent that satisfies the solubility criteria, consider the toxicity, flammability,
[PDF File]Thin Layer Chromatography (TLC) Guide
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Revise your choice of solvent system based on the results of your initial TLC. Make the solvent system more polar if you want a larger Rf or make it less polar if you want to decrease the Rf. Also, if there is "streaking" of your compound on the plate -basically you see large streaks instead of sharp circles - your sample is probably too ...
[PDF File]EXPERIMENT 2: Recrystallization and Melting Point ...
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1. What are the important solubility characteristics for a solvent for crystallization of an organic solid which is contaminated with a small amount of impurity? Remember you want to separate the desired solid from the contaminating impurities. 2. There are many opportunities during a recrystallization to lose crystals. How could you improve your
[PDF File]Trichloroethylene (TCE) Fact Sheet
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regulation GISO 5194), your employer must tell you if you are working with any hazardous substances, including TCE, and must train you to use them safely. If you think you may be exposed to hazardous chemicals at work, ask to see the Material Safety Data Sheets (MSDSs) for the products in your work area. MSDSs can be very hard to
[PDF File]CH 241 EXPERIMENT #1 WEEKS OF SEPTEMBER 10, 17, AND 24 ...
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that you try to maximize your yield. In general, you will choose a solvent in which your compound is quite soluble when the solvent is hot, and very much less soluble when that solvent is cold. In other words, you want a solvent that has a steep solubility vs temperature curve for your compound (solvent B in the graph below).
[PDF File]Experiment 6 — Thin-Layer Chromatography
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solvent. (3) Use your drawing to show how the Rf value is determined. Thin-layer chromatography (TLC) is an extremely valuable analytical technique in the organic lab. It provides a rapid separation of compounds, and thereby gives an indication of the
[PDF File]KEY CONCEPT A solution is a type of mixture.
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water is the solvent. In the cells of your body, substances such as calcium ions and sugar are solutes, and water is the solvent. Water is the most common and important solvent, but other substances can also be solvents. For example, if you have ever used an oil-based paint you know that water will not clean the paintbrushes. Instead, a solvent
[PDF File]Flash Column Chromatography Guide - MIT OpenCourseWare
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you are adding solvent - if you add solvent too fast, it can destroy a flat column (thus hurting separation) unless it is protected by sand. 17) Using the compressed air, lower the solvent level until it is even with the height of the sand. 18) Close the stopcock and put your first test tube under the column outlet.
[PDF File]Paper Chromatography of Pigments in a Spinach Leaf
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9) Remove the paper from the chamber when the solvent front is approximately 1.0 cm from the top of the paper. With a pencil, mark the level of the solvent front (highest level the solvent moves up the paper) as soon as you remove the paper from the chamber (the solvent evaporates and disappears quickly) – This is your SOLVENT FRONT.
[PDF File]Acid-Base Extraction
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is a solvent-solvent extraction. Before looking at what makes it an acid-base extraction, first consider solvent-solvent extractions in general. A requirement of a solvent-solvent extraction is that the two solvents be mostly insoluble in one another. That is, a mixture of the two solvents will separate into two layers.
[PDF File]RECITATION NOTES FOR EXPERIMENT # 5 A B THIN LAYER ...
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If you wait too long, it will fade and you will miss a crucial part of information needed to calculate the R f values. If a poor separation is obtained with a certain solvent, the experiment needs to be repeated with a solvent of different polarity. As with crystallization, solvent mixtures can be used to achieve intermediate degrees of polarity.
[PDF File]Crystallization is used to purify a solid. The process ...
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To remove solvent: 1. You must have ebullation to concentrate at atmospheric pressure--use a boiling stone, a capillary tube, or agitation. 2. If you used reduced pressure to concentrate solution, use the water aspirator with a TRAP in the line. DO NOT turn off the water until the pressure is released.
[PDF File]Experiment 3: Acid/base Extraction and Separation of ...
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1. To remove organic compounds (what you want) from aqueous solutions (or what you don’t want), we perform an “extraction”. For neutral organic compounds, we often add an organic solvent to dissolve a neutral organic compound to separate it away from inorganic, aqueous soluble “trash”.
[PDF File]CHEM 344 Thin Layer Chromatography
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at the position you’ve marked. Keep the spots small! 3. Pour approx. 3 mL of solvent into a screw-cap jar, place a piece of filter paper in the jar and wet the paper with the solvent to saturate the atmosphere. Make sure that the solvent is shallow enough that it will be below the spot line on your plate. 4.
[PDF File]Solvents in the Workplace
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If you have determined that the solvents in your facility are not solid wastes, then they are also not hazardous wastes. You have completed the solvent hazardous waste determination process. Note that your material or the conveyances and systems that handle your material may be subject to other environmental regulation. 5.
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