Separation by Solvent Extraction To separate a mixture consisting of a carboxylic acid and a neutral compound by using solvent extraction techniques. Introduction Frequently‚ organic chemists must separate an organic compound from a mixture of compounds‚ often derived from natural sources or products of synthetic reactions. One technique used to separate the mixture compounds is called extraction. Extraction is a process that selectively dissolves one or more of the mixture components into an appropriate solvent
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1. Predict the molecular formula of an alkane with 13 carbon atoms. .................................................................................................................................. [Total 1 mark] 2. Bromobutane‚ CH3CH2CH2CH2Br‚ can be reacted with hot aqueous sodium hydroxide to prepare butan-1-ol. CH3CH2CH2CH2Br + OH– → CH3CH2CH2CH2OH + Br– A student reacted 8.72 g of bromobutane with an excess of OH–. The student produced 4.28 g of butan-1-ol. (i) Calculate the amount
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visible results on your TLC plate‚ as sometimes it can be hard to get a sample to show up clearly on the plate. But not knowing which compound is which is a huge problem that will lead to incomplete conclusions and the need to redo your TLC. However‚ due to the knowledge we have of the compound on the plate we can determine which compounds are which. The two compounds you used are very similar in structure with one very important difference of the hydroxyl group on 4-phenylphenol that isn’t present
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homogeneous pure substance – compound mixture – heterogeneous 1. HCl (aq) mixture – homogeneous 2. sugar pure substance – compound 3. KBr (s) pure substance – compound 4. soil mixture – heterogeneous 5. Cl2 (g) pure substance – element 6. water pure substance – compound 7. CH2(OH)2 (aq) mixture – homogeneous 8. sodium pure substance – element 9. Hg (l) pure substance – element 10. iron oxide pure substance – compound 11.NH3 (l)
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and Bases 3.2 Stoichiometry and Compound Formulas 3.1 The Mole and Molar Mass 3.2 Stoichiometry and Compound Formulas 3.3 Stoichiometry and Chemical Reactions 3.4 Stoichiometry and Limiting Reactants 3.5 Chemical Analysis Chapter Summary Chapter Summary Assignment Reference Tools Periodic Table Molarity Calculator Molar Mass Calculator Unit Converter Thermodynamic Data 3.2e Hydrated Compounds A hydrated ionic compound is an ionic compound that has a well-defined amount of water
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Extraction of volatile compounds Fish sauce samples were extracted volatile compounds by Monolithic Material Sorptive Extraction (MMSE). 5 mL of each fish sauce sample was pipetted into a vial (15mL). Internal standard (I.S.) was 1000 ppm 2‚4‚6-trimethylpyridine (TMP‚ purity 99 %). A Mono Trap (MT) rod was used for headspace MMSE with a sample.
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This experiment was focused on the cooperative identification of organic compound by its chemical properties such as: slow melting point‚ mixed melting point‚ Rf values in TLC experiment‚ IR spectrum analysis‚ and H NMR spectra. Such data can provide the the identity of functional groups and the identity of the compound itself. In this experiment students were taking the slow melting point of their unknown compound. The tabulated list of all melting points of all students in the lab was created
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to purify solid organic compounds. Using the recrystallization technique‚ a solid compound is dissolved in a solvent and the compound slowly crystallizes as the solution cools. Using a filtration technique‚ a pure solid is produced when the molecules of the impure particles in the compound are excluded from the crystal lattice. After obtaining the pure compound‚ a melting point determination procedure can be done using a mel-temp device to correctly identify the compound if its identity is unknown
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1. In table format‚ provide the Rf values you recorded for each of the 3 compounds in Part I. List compound on one axis of your table and solvent system on the other. If multiple spots were present for a compound‚ give Rf value for each component and state if the component was major or minor. | 100% hexane | 25% EtOAc in hexane | 10% EtOAc in hexane | Fluorene | 0.34 cm | 0.94 cm | 0.67 cm | 9 - fluorenol | 0.00 cm | 0.49 cm | 0.05 cm | 9 - fluorenone | 0.00 cm | 0.69 cm | 0.21 cm |
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identify Two-Word Adjectives. Stress compound adjectives. Write a descriptive paragraph. You must aim to: 1. identify two-word adjectives called compound adjectives 2. correctly stress compound adjectives 3. keep in mind that the first element in the compound is stressed. 4. develop the topic using coherent and organized sentences YOUR INITIAL TASK Task I. Identify Compound Adjectives On a sheet of paper‚ copy the following sentences and underline the compound adjectives. 1. I’ve seen the 20-storey
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