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Recrystallization- Purifying an Unknown CHM 220
starting materials. When these reactions are completed is it often necessary to purify the resulting product, separating the side-products, left over reagents and or consumed reagents from the desired product. Similarly in the natural work it is rare to find a compound in a pure form. The techniques used
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Spectroscopy Experiment
classes.kvcc.eduThe metal ion is extracted from the sample and prepared for analysis. Today we will be determining the absorbance spectrum for the cobalt (II) ion and determining the concentration of cobalt (II) chloride in unknown samples. Cobalt (II) chloride is often used to detect moisture. The anhydrous form of cobalt ... Determination of the ...
Experiment: Identification of Unknowns* Introduction
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classes.kvcc.eduCHM130 Solubility Product Experiment Experiment: Solubility Product Constant (Ksp) for a Salt of Limited Solubility Introduction: The equilibrium process in this experiment is a saturated aqueous solution of calcium iodate, Ca(IO 3) 2. The relevant solubility equation and solubility …
pH Measurements and Buffer Laboratory Introduction
classes.kvcc.eduCHM130 pH and Buffer lab pH Measurements and Buffer Laboratory Introduction: pH is a measure of the acidity of an aqueous solution.It is related to the concentration of hydrogen ion, H+.The pH scale can tell if a liquid is more acid or more base,
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classes.kvcc.eduA hydrate is an ionic compound that has a definite amount of water molecules attached to its crystalline structure. The ratio of water mol ecules to the anhydrous salt is constant. Many compounds exist as hydrates. Some examples are copper (II) sulfate, sodium sulfate, nickel (II) sulfate, iron (II) sulfate, cobalt (II) chloride, magnesium sulfate,
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Paper Chromatography of Amino Acids
classes.kvcc.edu1. Obtain a 24 x 15.5 cm rectangle of Whatman No. 1 filter paper. Handle this paper by the top edge only. If the paper is handled carelessly, fingerprints may appear as colored spots on the chromatogram. 2. Place the rectangle on a clean paper towel or piece of paper. 3. About 1.5 cm from the bottom of the paper, pencil a line (DO NOT USE PEN ...
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classes.kvcc.eduReagent—Prepare the Karl Fischer Reagent as follows. Add 125 g of iodine to a solution containing 670 mL of methanol and 170 mL of pyridine, and cool. Place 100 mL of pyridine in a 250-mL graduated cylinder, and, keeping the pyridine cold in an ice bath, pass in dry sulfur
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classes.kvcc.eduRed Bull 8.3 oz. 80 Red Bull Sugarfree 8.3 oz. 80 Rockstar Energy Drink 8 oz. 80 SoBe Adrenaline Rush 8.3 oz. 79 Amp 8.4 oz. 74 Glaceau Vitamin Water Energy Citrus 20 oz. 50 SoBe Essential Energy, Berry or Orange 8 oz. 48 . Title: Determination of Caffeine in Beverages Author: TTC Library Created Date: 1/31/2012 11:39:46 AM ...
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EXPERIMENT 2: Recrystallization and Melting Point ...
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blogs.stockton.eduCrystallization is a purification technique in which an impure solid is dissolved in a hot (usually boiling) solvent and the solution is filtered and cooled to room temperature or below, in order to crystallize the pure solid.