EXPERIMENTAL PROCEDURE: 1. 2.07 g of the mixture of naphthalene and benzoic acid was weighed accurately on a balance. The mixture was then dissolved in 40 ml dichloromethane and the solution was poured into a separatory funnel. 2. 20 ml of aqueous sodium bicarbonate solution was added to the dichloromethane. A stopper was placed on the separatory funnel and was shaken and pressure was frequently released. The 2 liquids separated into clear layers and the lower layer (dichloromethane layer) was
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The Purity and Purification of Solids Melting Point Lab Introduction: The point of this lab was to determine the eutectic point for the naphthalene biphenyl mixture‚ as well as determining the melting point of an unknown substance by comparing it with two known samples. Melting point is a temperature in which a substance changes from solid state to liquid state. Melting points are used to determine whether the given substance is pure or not. Substances that melt sharply‚ less than 1-2°C indicates
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analysis of naphthalene‚ a hydrocarbon used in mothballs‚ produced 8.80g CO2 and 1.44 H2O. Calculate the empirical formula for naphthalene. 8.80g CO2 (find moles of Carbon by dividing the molar mass and doing the molar ratio of C and CO2 = 0.200mol C. 1.44H2O (find moles of Hydrogen by dividing the molar mass of water and doing the ratio of 2moil H/1molH2O) 0.160mol H divide them by the smallest number of moles C = 1.25 H= 1 Multiply 4= 5‚ H=4 1) If the molar mass of naphthalene is 128
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Introduction I. Goal a. The goal of the Extraction lab is to separate and purify benzoic acid‚ 2-naphthol‚ and naphthalene. These organic solids are purified by partitioning the solid in 2 immiscible solvents‚ diethyl ether and sodium bicarbonate or sodium hydroxide. II. Significance a. The significance of the Extraction lab is to purify Acetanilide benzoic acid‚ 2-naphthol‚ and naphthalene by determining the partition coefficient. This value is determined by dividing the solubility of the given
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Naphthalene Ball in Water Objective: In this experiment‚ we will determine if the naphthalene can be dissolve in water or not. And what will happen in the filter paper if we stick it in the funnel and let it absorbed the fumes in the boiling water with powdered naphthalene. Materials: Evaporating dish Spatula Watch Glass Filter paper Tripod Mortar and pestle Alcohol Lamp Funnel Beaker Data: Naphthalene 1. white crystalline compound 2. has a strong odor 3. round
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conducted for 3 weeks. The purpose of the first week was to familiarize ourselves with the equipment and actually conducting the experiment. The second week of the experiment was focused on gathering data for benzoic acid and for the third week‚ Naphthalene was experimented on. Upon entering the lab‚ the parts of the cathetometer were already unpacked and ready to be assembled. Since the experiment took 3 weeks‚ the majority of the procedure was the same with some slight differences. The procedure
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constant of a chemical reaction at one temperature to the equilibrium constant of the same reaction at a different temperature‚ allowing it to be worked out for all temperatures if it is known for one. The experiment used the solution of toluene and naphthalene to determine the change in enthalpy. The mole fractions and the tempterature of recrylstallizations were graphed and the slope was determined. From the slope the change in enthalpy was determined to be 3.45J. This implies that energy is absorbed
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monitored the temperature and time during the phase change of a heated sample of naphthalene pellets until melted to freezing point. The time and temperature change of the reaction are graphed to identify the changes in enthalpy and entropy that took place as the melted substance solidifies. Using the data we can then predict the change in free energy‚ ΔG . Keywords/s: Entropy‚ Enthalpy‚ Free energy‚ naphthalene II. Introduction Enthalpy‚ H‚ is a thermodynamic property of a system. It is defined
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and a neutral compound or a base and a neutral compound‚ but since the components are unknown‚ the student conducts the experiment as if all 3 compounds are present. In this particular experiment‚ the compounds are benzocaine‚ salicylic acid‚ and naphthalene. An appropriate organic solvent is used to create the ether phase. Diethyl ether is used because it has low solubility in water but will dissolve the components of the mixture (creating liquid layers)‚ is not acidic or basic‚ is less dense than
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TWO-BASE EXTRACTION OF BENZOIC ACID‚ 2-NAPHTHOL‚ AND NAPHTHALENE FROM UNKNOWN SAMPLE # 131 Douglas G. Balmer (T.A. Mike Hall) Dr. Dailey Submitted 11 July 2007 Introduction: The purpose of this experiment was to separate a sample of benzoic acid‚ 2- naphthol‚ and naphthalene of unknown proportions using a two-base extraction method. The three components of the mixture will react differently to sodium bicarbonate and sodium hydroxide because each of the bases’ conjugate acids has a different
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