to separate contaminating substances from a compound. In this experiment‚ I learned how to determine a solid’s melting point and why some melting point ranges may be broader than others. From my data‚ I also determined that water is not a good solvent for a lot of solids even when it is boiled. Also‚ when looking at boiling point‚ my data showed that ethanol has a low boiling point so it made me investigate further to see why that happened. Introduction All substances have properties that
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Eastman solvents—Technical tip Using Eastman methyl acetate in cleaning applications Introduction Considerations Eastman Chemical Company‚ the world’s leading producer of methyl acetate‚ offers this solvent in two grades to suit a variety of application needs: Wide formulation latitude • Regular (industrial) grade offers a minimum assay of 96%‚ a maximum methanol content of 2.5%‚ and a maximum water content of 1.5%. • High purity grade offers a minimum assay of 99.5%‚ a maximum
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absorbed and cleaned in a liquid solvent -- the fact that there is no water is why the process is called "dry." Like many inventions‚ dry cleaning came about by accident. In 1855‚ Jean Baptiste Jolly‚ a French dye-works owner‚ noticed that his table cloth became cleaner after his maid accidentally overturned a kerosene lamp on it. Operating through his dye-works company‚ Jolly offered a new service and called it "dry cleaning." Early dry cleaners used a variety of solvents -- including kerosene -- to
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I performed a number of steps during this recrystallization lab in order to achieve the desired results‚ which included heating the solvent‚ completing a hot filtration‚ completing a vacuum filtration of a chilled solution‚ as well as drying and calculating the weight and melting point of the final version of the sample. I began the lab with 1.5 grams of the impure acetanilide solute and ended the lab with 0.05 grams of pure acetanilide crystals. The percentage of pure acetanilide I recovered during
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Introduction: Organic compounds in an aqueous mixture can be separated by shaking the aqueous solution with a solvent which is immiscible with water. Extraction involves dissolving either a compound or compounds from solid into a solvent or from solution into another solvent. Acid-alkaline extraction is a commonly used method to recover a compound from solid or liquid and also a form of solvent-solvent extraction. Acid-alkaline extraction is a method to separate compounds according to their relative solubility
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chromatography paper and is slightly soluble in the solvent. Contrastingly‚ the chlorophylls are more tightly bounded to the chromatography paper and as a result travelled the least distance. 2. Would you expect the Rf value to be different with a different solvent? I would expect Rf value to be different with a different
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Korean J. Chem. Eng.26(3)‚ 679-684 (2009) Thickness of membrane ~ 50µm There are some disadvantages of the solution casting method that the cold cast films are generally mechanically weak‚ susceptible to crack formation and soluble in many polar solvents‚ especially in water at room temperature. Generally‚ the annealed films undergo morphological changes when heated above the glass transition temperature (Tg=109oC for protonated Nafion) leading to improvement of mechanical stability of the membrane
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as the blood is ________. A) isotonic to the blood B) molar to the blood C) hypotonic to the blood D) nontonic to the blood E) hypertonic to the blood 3) Water is a polar solvent and hexane (C6H14) is a nonpolar solvent. Which of the following correctly describes the solubility of the solute in the given solvent? A) CaCl2‚ soluble in hexane B) octane‚ soluble in water C) CCl4‚ soluble in water D) mineral oil‚ soluble in water E) NaHCO3‚ soluble in water 4) What is the concentration
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Organic Chemistry Laboratory Report. Experiment 1: Crystallization. Objectives: 1. To study the crystallization process. 2. To identify the best suitable solvent to use for the crystallization process. 3. Gain an experience in purifying an organic compound by the techniques of the crystallization. Introduction. Crystallization is a technique which chemists use to purify solid compounds. It is one of the fundamental procedures each chemist
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AROMATIC COMPOUNDS. There are three experiments in this chapter of the laboratory. First is the substitution by bromination. Second is the solvent effect which is dealing in the nature of the solvent. And third is the temperature test. Having this division in the experiment one‚ we can now conclude that substituent in substitution‚ the nature of the solvent polar or non-polar and the temperatures are the factors of electrophilic substitution on aromatic compounds. 1. INTRODUCTION The most
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