apparatus in the hood using a Thermowell Heater 2) Use a 25-mL round bottom flask fitted with a reflux condenser which will be connected through a vacuum adapter to a 500-mL filter flask. a. close vacuum adapter w/ cork and make sure the inlet tube does not reach the surface of the water in the filter flask b. make sure any water from the trap does not get sucked back into the reaction flask c. glass tube must not dip below the surface of the water in the trap
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analysis to determine the concentration of either an acid or a base. Titration is the slow addition of an acid (or a base) of known concentration from a burette (a narrow graduated cylinder) to a base (or an acid) of unknown concentration in an Erlenmeyer flask. We distinguish between strong and weak acids and also between strong and weak bases. So‚ four types of acid – base titrations are possible: strong acid – strong base‚ strong acid – weak base‚ weak acid – strong base‚ and weak acid – weak base
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70.3%. Experimental: 2 grams of technical grade aniline and 15ml water were placed in a 125ml Erlenmeyer flask. Then‚ 2.5ml of acetic anhydride was added while swirling the flask. An exothermic reaction started immediately with concomitant formation of a brown precipitate of crude acetanilide. 50ml of water and a magnetic stirring bar were added to stir the reaction mixture and the flask was heated on a magnetic stirring hot plate until all of the solid and oil were dissolved. The temperature
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Crystallization of Benzoic Acid Purpose: The purpose of this experiment is to purify benzoic acid by crystallization. Procedure: 1. 0.5g impure benzoic acid was placed in a 50mL Erlenmeyer flask. 15mL of water was added and the mixture was heated to a boil on a hot plate. 0.5mL of water was added to the flask‚ while swirling the flask. The mixture was boiled until the benzoic acid completely dissolved. The total volume of water used was recorded. The black solid that remain in the dissolved mixture
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experiment. (1) Weigh three clean dry labeled 125 mL erlenmyer flasks on an analytical balance. Place about 0.135 grams of oxalic acid dihydrate‚ H2C204.2H20‚ into each of the three separate flasks and reweigh the flasks containing the acid. (2) Set up a buret with KMnO4 solution to be standardized by titration. (3) Dissolve each acid sample in about 25 mL of distilled water. Again don’t mix up the samples. Take one flask and add 1-2 mL of concentrated sulfuric acid. · CAUTION
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Dehydrating Cyclohexanol • Introduction The purpose of the lab experiment is to prepare cyclohexene from cyclohexanol through an acid-catalyzed dehydration. In order to produce the cyclohexene from cyclohexanol‚ an elimination reaction was performed. First by protonating the oxygen of the alcohol and creating an oxonium ion we replaced the poor leaving group (OH) into a better leaving group (OH2+). Second‚ dehydrating the cyclohexanol using phosphoric acid and sulfuric acid as acid catalysts
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10-mL transfer pipet to add 10.00 mL of standardized calcium ion stock solution (1.000 g CaCO3/L solution) to a 250-mL Erlenmeyer flask which will have an additional 30 ml of deionized water to this titration flask. Adding a magnetic stir-bar the solution was then stirred. about 3 mL of ammonia/ammonium chloride buffer is added to the solution. Just prior to titrating the flask‚ adding four drops of Eriochrome Black T indicator
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25 g whole cloves (350 g per lab section) 100 ml DI water (1.5 L per lab section) 10 ml 5% NaOH (150 ml per lab section) 45 ml CH2Cl2 (650 ml per lab section) Mg SO4 or Na2SO4 (anhydrous) Apparatus Items in kit 250-ml round-bottomed flask distillation head thermometer adapter large bore condenser Claisen adapter 125-ml separatory funnel Items not in
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572‚ 46.288. Next‚ hydrolysis of the anhydride took place. The anhydride was combined with distilled water in a 125 mL Erlenmeyer flask and heated. After twenty minutes the solid is partially dissolved and removed from the hot plate. The solution sits at room temperature for thirty minutes and a boiling chip is placed in the flask. Instantly crystals begin to form and flask is put in an ice bath. Vacuum filtration is preformed to collect the product and washed with cold water. Mass of the product
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anhydride Sulfuric acid 125 mL Erlenmeyer flask Scale Water Hot water bath Ice Bath Buchner Fünnel 1% Ferric Chloride Ethyl acetate Glass Rod Iodine Aspirin Tablet Commercial Aspirin tablet METHODS Part A 1. 2.0 g of salicylic acid was placed in a 125 mL Erlenmeyer flask. 2. 5.0 mL of acetic anhydride was added to the flask and five drops of concentrated sulfuric acid was also added. 3. The flask was swirled to dissolve the salicylic acid. 4. The flask was placed in a hot water bath
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