Fill in the blanks: a) The component of the mixture that becomes a water soluble salt by treating the two component mixture with sodium hydroxide solution has the highest _______________. b) The lower phase in equipment used for liquid-liquid extraction in a water-dichloromethane mixture is_____________, because _______________. c) The component of the mixture that becomes a water-soluble salt is the one with the greatest ______________

Fill in the blanks: a) The component of the mixture that becomes a water soluble salt by treating the two component mixture with sodium hydroxide solution has the highest _________. b) The lower phase in equipment used for liquid-liquid extraction in a water-dichloromethane mixture is_, because _. c) The component of the mixture that becomes a water-soluble salt is the one with the greatest ______

Macroscale and Microscale Organic Experiments

7th Edition

ISBN:9781305577190

Author:Kenneth L. Williamson, Katherine M. Masters

Publisher:Kenneth L. Williamson, Katherine M. Masters

Chapter7: Extraction

Section: Chapter Questions

Problem 1Q

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please Answer all four parts Chemistry 1. The name of the equipment used to separate 2 immiscible phases by extraction is _____________________. 2. The component of the mixture that transforms into a water-soluble salt on treating the two-component mixture with sodium hydroxide solution is the one that has the highest ___________________. 3. The lower phase in equipment used for liquid-liquid extraction in a mixture of water-dichloromethane is_________________, because __________________ ______________________________________________. 4. What is magnesium sulfate used for at the end of the extraction? How I know can you delete?
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?
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?
Which of the following statements about fractional distillation are true.? Select all that are True. A)The lower the HETP (height equivalent to a theoretical plate) of the fractionating(packed) column the more efficient it is at separation of components. B)The distillation process involves several concurrent vaporization-condensation cycles. C)Continual change in boiling temperature is observed as the distillation progresses. D)Can ideally separate mixtures with comparable volatilities small BP differences. E)For good separation by distillation the volume of liquid condensing back to the pot should be lower than the volume of liquid distilling off.
Which statement about liquid-liquid extraction is not correct? * A- A solvent must be available that is miscible with the solution containing the substance to be extracted. B- The solvent used for extraction must have a good ability to dissolve the desired substance. C- The denser solution forms the bottom layer in the extraction funnel. D- The extraction funnel must be vented during the extraction procedure to prevent excessive build-up of pressure inside the extraction funnel. E- All these statements are correct.
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.
Answer the questions below. a) 500 ml. Acetic acid in 200 mL acetic acid-water mixture containing 30% acetic acid by volume with pure isopropyl ether will be separated by LIQUID-LIQUID extraction. Assuming the dispersion coefficient of acetic acid in isopropyl ether+water carjumine is 2, calculate the amount of acetic acid that passes into the organic phase and the extraction yield. b) What are the desired properties of the solvents used in liquid-liquid extraction processes?
Based on the melting point of your impure solid, you look at the given samples and believe you havecompound A. Compound A is recrystallized using a mixed solvent system of ethanol and water. You add1 ml of hot ethanol to your sample and it doesn’t completely dissolve. You continue to add hot ethanolbut there isn’t any change. Some solid remains. What should you do next?
Which of the following could DECREASE the amount of the recovered crystals in the purification by recrystallization experiment? Collecting the recrystallized benzoic acid by filtration using a pre-weighed filter paper. Using a long-stemmed funnel in the hot filtration step. Cooling the filtered solution rapidly. Washing the recovered crystals using hot solvent. a. II, III b. II, IV c. II, III, IV d. I, II, III, IV
is water a good solvent for recrystallization for acetanilide based on the image?
The best liquid mixtures for separation by simple distillation need to have boiling points that differ by at least ___________ oC. 10 20 30 40
Sophia and her friend Nora have the same unknown solid. Sophia has progressed a little faster withthe purification process, but now she is standing around twiddling her thumbs because no crystals areforming, even over an ice bath. Nora decides that Sophia’s problem is too much solvent. Determinednot to have the same problem, Nora uses a minimal volume of hot solvent to dissolve her compoundbefore doing the gravity filtration step. She begins to pour her hot solution into the filter cone of along-stemmed funnel and ….is that missed impurities sprouting up on the funnel walls? Why so shiny?Explain what Nora did wrong and how to fix the problem.