solution and watch the calcium carbonate precipitate form. After the Calcium Carbonate Precipitate was formed the next step was to make a funnel out of the filter paper by folding it in half twice then weighing the dry filter then opening on of the sections to make a filter in the shape of a funnel. Then I placed the funnel filter inside the actual funnel and then placed that in a coffee cup. The next step was to swirl the beaker of the precipitate to evenly distribute the contents
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are pyramid‚ funnel & diamond interview techniques? Pyramids: Begins with very detailed‚ often closed questions‚ then the questions are expanded by allowing open-ended questions and more generalized responses. The pyramid technique is useful if interviewees need to be warmed up to the topic or seem reluctant to address the topic. Funnel: Begins with very detailed‚ often closed questions‚ and then concludes by narrowing the possible responses by using closed questions. The Funnel structure provides
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alkaline Objective: 1. To recover benzoic acid and p-dichlorobenzene from its mixture using acid-alkaline extraction. 2. To determine the percentage recovery and melting point of benzoic acid and p-diclorobenzene. Apparatus:Separatory funnel(250mL)‚Buchner funnel‚beaker. Materials:Benzoic acid‚p-dichlorobenzene‚ether‚10% NaOH‚conc.HCl‚distilled water‚ anhydrous CaCl2. Introduction: Organic compounds in an aqueous mixture can be separated by shaking the aqueous solution with a solvent
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Pour the tea solution into a separating funnel. b. Add 20ml of dichloromethane is added to it. (observe separation of the mixture into two layers‚ bottom layer dichloromethane‚ top layer tea due to the fact that it has a lower density ) c. Remove the funnel from the stand and keep your fingers on the stopper and carefully shake the separating funnel. d. Vent the separating funnel periodically (every 30 sec) to relieve vapour pressure created inside the funnel. e. When the contents have been sufficiently
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resinous impurities are usually large‚ relatively polar organic molecules which have a strong tendency to be adsorbed on surfaces. Filtration of the hot mixture must be done rapidly to avoid crystallization of material on the filter paper or in the funnel. The filtrate should be collected in an appropriately sized Erlenmeyer flask. Some crystals may have formed in the flask by the end of the filtration‚ but these are often very small and not well formed. They should be dissolved by warming the filtrate
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RECRYSTALLIZATION AND MELTING POINT DETERMINATION OF BENZOIC ACID ANSWERS TO QUESTIONS 1. How does the use of fluted filter paper hasten filtration? Why is it advisable to place a small piece of wire between the funnel and the mouth of the flask during hot filtration? Fluted filter paper is effective in preventing crystal formation in the filter paper. It is also often used in filtering hot saturated solution used during crystallization. One major advantage of a fluted filter is that it increases
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Gravimetric Analysis CHEM 200-03 Fall Semester 2012 September 19‚ 2012 Jeff Marasigan Abstract Gravimetric analysis is based on the quantitative isolation of the desired constituent the analyte of interest from the sample in highly pure form or in some combined form and weighing the isolated constituent. The desired constituent is usually isolated or separated by precipitation. From the weights of sample and precipitate‚ the percentage of the constituent in the original sample can
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inclined plane. That skateboard drops onto two rows of dominoes. One row leading to nowhere‚ the other leading to a moousetrap. While that was happening‚ the first mousetrap sets a marble on a ledge into actrion. That maarble rolls off the ledge into a funnel with piping leading it to a second mousetrap. Attached to that mousetrap is a piece of string that runs through a pulley. Attached to the end of the string is a cup with a marble in it‚ with a weight attached to the opposite side. Once the second
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Preparation of t-Butyl-Chloride March 8 & 15‚ 2012 Theory: Alkyl halides can be synthesized when alcohols react with hydrogen halides. An alkyl halide is a halogen-substituted alkane‚ and a hydrogen halide is a compound consisting of a hydrogen bonded to a halogen (H-X). Alkyl halides are classified as primary‚ secondary‚ or tertiary depending on the number of alkyl substituents directly attached to the carbon bearing the halogen atom. The purpose of this laboratory experiment was to prepare
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Experiment 1: Synthesis of Isopentyl Acetate via Fischer Esterification Introduction: Isopentyl acetate‚ banana oil‚ is a naturally occurring compound that has a very distinct and recognizable odor. It is most commonly found in bananas but also can be found in other organisms. The purpose of this lab was to synthesize the ester isopentyl acetate via an acid catalyzed esterification (Fischer Esterification) of acetic acid with isopentyl alcohol. Emil Fischer and Arthur Speier were the pioneers
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