In this experiment, a mixture of three component will be used. We will separate the components using acid/base extraction, that is, a type of solvent extraction. Oa. False Ob. True
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We will separate the components using acid/base extraction, that is, a type of solvent extraction." Acid-base extraction is a common laboratory technique used to separate organic compounds based on their acidic, basic, or neutral properties. It is indeed a type Show more…
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An aqueous sample contains a complex mixture of organic compounds, all of which are at trace concentrations. The compounds can be grouped into broad categories of organic acids, organic bases, and neutral organics (i.e. compounds that act as neither an acid nor a base in solution). The desire is to have three solutions at the end, each in methylene chloride, one of which contains only the organic acids, the second contains only the organic bases, and the third contains only the neutrals. Devise an extraction procedure using liquid-liquid extraction that would allow you to perform this bulk separation of the three categories of organic compounds. You have acids and bases available to alter the pH of the solutions as you need. It may help to sketch the sequence of events you plan to use before describing it below (you may send a pictorial flowchart to Dr. Tran if you would like).
Adi S.
The Experiment Before any experimentation is to begin, you must flow chart the separation scheme for the liquid-liquid extraction for the three component unknown. You will be given a three component mixture of a carboxylic acid, amine (a base), and neutral compound to be separated by liquid-liquid extraction. Your unknown will consist of either benzoic acid or o-chlorobenzoic acid (the carboxylic acid), para- or meta-nitroaniline (the base), and acetanilide or benzamide (the neutral substance). The objective of this experiment is separate the mixture into its individual components by acid-base extraction, purify each component by recrystallization, determine the percentage recovery of each from the mixture, and identify each substance in the mixture. Acidic Basic Neutral COOH NH2 NHCOCH3 O2N para-nitroaniline benzoic acid acetanilide COOH NH2 CONH2 NO2 benzamide ortho-chlorobenzoic acid meta-nitroaniline PRE-LAB 1. Look up and record the molar masses, melting points, boiling points and solubilities in water for each compound listed above. 2. You are going to extract from methylene chloride and water of variable pH a three component mixture; an acid, base and neutral compound. In your notebook, make a similar flow chart as the "General Separation Scheme for Acidic and Neutral Compound" shown for the separation of benzoic acid and acetanilide, but label the flow chart as "General Separation Scheme for Acidic, Basic, and Neutral Compound." Flow chart the separation of a mixture of p-nitroaniline, benzoic acid and acetanilide, and start your flow chart by first extracting the three component mixture with hydrochloric acid. How did the acid-base extraction of a three component mixture charge your general separation scheme shown above? Have your instructor initialize your flow chart before conducting any experimentation. 3. After your follow chart and under the heading "Acid-Base Reactions," write out all acid-base reactions involved in the separation of a benzoic acid, acetanilide, and p-nitroaniline mixture.
Sri K.
Madhur L.
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