Consider a mixture of the compounds shown below dissolved in hexane (C,H14). CH3(CH2)10CH3 CH3COOH CH,CH2CH2OH CH3COCH,CH3 IV The mixture is separated using the TLC technique. The solvent used as mobile phase is benzene (a non polar solvent) and the plate used as stationary phase consists of a coat of silica (SiO,). Which compound will move faster? O II OIV
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- 1a. Use the given table to construct a temperature-composition diagram for cyclohexane Toluene mixture. Based on the plot, what is the composition of the distillate obtained by Simple distillation 20 mole percent cyclohexene and 80 mole percent toluene? Show your Work on the plot. 1b. Estimate the composition of the distillate of 20 mole percent of cyclohexane if the Distillation column had three theoretical plates.There are two separate phases, one with a composition of 12% phenol and the other with a composition of 60% phenol, from a 210 gram phenol-water mixture at 60 °C with a composition of 35% phenol. Calculate the masses of these phases.1 g of organic matter dissolved 20 times more in ether than water is dissolved in 500 cm3 of water. Organic matter will be extras from the aqueous phase using 20 cm3 of ether each time. How many times should the extraction phase be repeated to extraction at least 90% of organic matter massively?
- A student is given a solid mixture containing 2 polar components and 1 nonpolar component. The student is asked to separate the nonpolar component by solid-liquid extraction. Which of the following solvents is the most appropriate to use for the extraction? Group of answer choices methanol (CH3OH) H2O hexane (C6H6) ethanol (CH3CH2OH)In a separatory funnel, if "The layer separating the two solvents (organic & aqueous) is not visible" Describe two methods by which you can solve this problem and locate the separation between the 2 layers.10g coffee 4g sodium carbonate 40m dichloromethane 160ml distilled water coffee filter What are the principles behind caffeine being extracted from coffee using the above items? 1st sodium carbonate mixed with coffee then brought to a boil for 20min then solution/grinds are filtered. Then solution is added to a separatory funnel with 15ml of dichloromethane and two layers are observed so the bottom layer with DCM contains the caffeine, then this layer is collected in a beaker and dried out using molecular seeds. Then the solvent is brought to a boil with crude caffeine remaining and recystallized using 95% ethanol and brought to a boil again. Then the contents are vaccum filtered and allowed to dry resulting in 30mg caffeine.
- Water and 1-butanol are only partially miscible, so that when the two liquids are mixed, separate phases are formed. A mixture is prepared, in which the volumes of the aqueous and organic phases are equal. Ethanoic acid is then added to the mixture. The concentration in the aqueous phase is 0.094 mol dm-3 and in the organic phase 0.014 mol dm-3 . Additional solvent is then added such that the volume of the aqueous phase becomes double that of the organic phase. What are the new concentrations?hree components in a mixture have varying distribution constants between the mobile phase and the stationary phass One of the components has a very low distribution constant, Would this component likely elute first or last and how would you design an experiment or modify the components of the separation to make it perform in the opposite manner?A spot of crude plant extract was placed on a glass plate coated with C18 silica gel. The chromatogram was developed using an appropriate solvent. The result is shown below. Which of the following spot is the most soluble in water?
- A chemist is asked to separate the components of a mixture composed of 1.00 g each of the two compounds shown below. The chemist has access to the following bases: 10% aqueous NaHCO3 and 10% aqueous NaOH. Which base and how many mLs of the base (i.e., the minimum amount) are needed to completely separate these compounds from each other by liquid-liquid extraction?During the formation of the n-butyl bromide, a washing is carried out with the NaHCO3 solution and 2 phases are formed again. What is the organic phase? JustifySolution Calculations Using unit analysis, clearly show the set-ups for your calculations. You wish to prepare 50.0 mL of 2.30 x 10–2 M solution of Levothyroxine (hint-how many grams will you need of Levothyroxine?) 1. Describe how to prepare this solution from the pure drug and deionized water. Analytical balances and volumetric flasks are available to you. (Assume that Levothyroxine dissolves in water, at least to the extent necessary for this problem.) Use complete sentences in your description of the solution preparation process. a. A patient is given 2.0mL of a 3.00% (m/v) solution of Levothyroxine, how many milligrams of the drug did they receive? b. What is the molarity of a 3.00% (m/v) solution of Levothyroxine?