filtration and washed with cold water (2 x 1.0mL) then let dry to yield aspirin (0.1732‚ 63%) as solid form. Mp. 133-136 oC (lit[2] 134-136 oC). Discussion: The reaction of synthesis of aspirin with salicylic acid an acetic anhydride with phosphoric acid as catalyst formed acetylsalicylic acid in 63% yield as crystalline solid. The melting point of the crystals was determined to be 133-136 oC‚ which is within the reported literature range and supports the identity of the desired reaction product. The narrow
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EXPERIMENT 7 - Distillation – Separation of a Mixture Purpose: a) To purify a compound by separating it from a non-volatile or less-volatile material. b) To separate a mixture of two miscible liquids (liquids that mix in all proportions) with different boiling points. Equipment / Materials: large test tubes(3) clamp (1 or 2) ringstand boiling chips test tube rack (1) heating mantle glass adaptor thermometer adaptor 10-mL graduated cylinder condenser (1 or 2) grease 50- mL round bottom flask 50-
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Character Analysis The Story: the Monkey’s Paw * Character: Pamela * Point of View: Third Person Omniscient * Writing Genre: Descriptive * The Monkey’s Paw was a descriptive story because throughout the whole story they were describing the paw and throughout the Afterlife you will see Pamela describing her feelings on what happen to her brother Herbert. * Fiction Genre: Mystery * I picked mystery for the Monkey’s Paw because in the end of the story I wasn’t clear on what
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Chloroform has a molar mass of 119.4 g mol-1 and a density of 1.499 g cm-3. Estimate the volume of the above mixture using this information. 3. Calculate the molal freezing point depression constant Kf for 1-octadecanol using: Tf = 57.95 oC‚ Hfus = 74.047 kJ mol-1‚ and M = 270.5 g mol-1. ΔTf = Kf m 4. A polymer chemist dissolves 20.00g of polystyrene in 1.000L of benzene. The solution is found to generate an osmotic pressure of 1.000 kPa at 298.0K. Calculate the average molecular
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I9 EXPERIMENT Charles’Law MATERIALS AND EQUIPMENT 125 mL Erlenmeyer flask‚ one-hole rubber stopper‚ glass and rubber tubing‚ pneumatic trough‚ thermometer‚ screw clamp. DISCUSSION The quantitative relationship between the volume and the absolute temperature of a gas is summartzed in Charles’law. This law states: at constant pressure‚ the volume of a particular sample of gas is directly proportional to the absolute temperature. Charles’ law may be expressed mathematically: V ". T (constant pressure)
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Binh’s climate. Ninh Binh lies in the intertropical monsoon zone. There are four seasons‚ including spring‚ summer‚ autumn and winter. The mean annual temperature is about 23 degree C with lowest temperature ranging from 13 oC to 15 oC in January and with highest temperature of 28.5 oC in July. The total hours of sunshine annually are more than 1‚100 hours. With over 1‚400km2 of natural area‚ Ninh Binh’s topography comprises three different types of landscapes: wetlands‚ coastal delta‚ hills and mountains
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** PRICE IS STRICTLY FOR BUNDLE PURPOSE ONLY‚ TERMS & CONDITIONS APPLY PROCESSOR ** INTEL PROCESSOR CELERON G470 CELERON G1620 DUAL CORE G2020 DUAL CORE G2030 CORE I3 3220 CORE I3 3240 CORE I5 3470 CORE I5 3570K DUAL CORE G3220 CORE I3 4130 CORE I3 4330 CORE I5 4440 CORE I5 4570 CORE I5 4670 CORE I5 4670K CORE I7 4770 CORE I7 4770K CORE I7 4820K CORE I7 4930K CORE I7 4960X extreme XEON E3 1230 V3 AMD PROCESSOR SEMPRON 145 ATHLON II X2 270 X4 FX 4300 4-cores X4
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To: Aron Huckaba From: Peyton Lewis Date: 9/20/12 Subject: Experiment 3: “Identifying a Constituent of Panacetin” Partner: Julie Covington Introduction This experiment was a continuation of Experiment two‚ with a slightly different question to be answered. In this experiment‚ we are trying to find the identitiy of the unknown component of Panacetin. This is answering question 2 of the two questions that were to be answered in experiment 2. The equation of this reaction is as follows (and
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Title: Chapter 7: Bacterial Growth Purpose: The purpose of this experiment is to observe the bacterial growth of Escherichia coli under various conditions. Physical factors and nutritional requirements determine the overall concentration of the bacteria. Along with the use of a spectrophotometer and the technique of serial dilution‚ countable colonies can be obtained. Results are plotted on a semi-log graph in order to observe the different growth curves corresponding to optical density (cell
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Experiment B2‚ Heats of Combustion – The Bomb Calorimeter. Objectives: To calibrate a bomb calorimeter by the combustion of benzoic acid. Then to use the calibrated calorimeter to measure the heat of combustion of naphthalene and calculate the heat of formation of naphthalene. Theory: q = C.ΔTBA C = q / ΔTBA Moles = mass / Mr ΔŪ = ΔU / moles ΔHoc‚298 = ΔŪoc‚298 + PDV = ΔŪoc‚298 + RTΔn C10H8 (s) + 12O2 (g) 10CO2 (g) + 4H2O (l) ΔHoc‚298 = - 1
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