Suppose a particular extraction proceeds with a distribution coefficient of 7.5 The mature consists of a certain amount of caffeine dissolved in 100 mL of water. a .How much caffone was originally used when 0.31 g of the organic compound was dissolved in water and 150 = L ether was used as extraction solvent b. How much was dissolved in ether

Suppose a particular extraction proceeds with a distribution coefficient of 7.5 The mature consists of a certain amount of caffeine dissolved in 100 mL of water. a .How much caffone was originally used when 0.31 g of the organic compound was dissolved in water and 150 = L ether was used as extraction solvent b. How much was dissolved in ether

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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2 Suppose a particular extraction proceeds with a distribution coefficient of 7.5. The mixture consists of a certain amount of caffeine dissolved 100 mL of water a. How much caffeine was originally used when 0.31 g of the organic compound was dissolved in water and 150 mL ether was used as extraction solvent b. How much was dissolved in ether?
Compound X has a distribution coefficient (K) of 5 for ether/water. If 5.0 g of compound X were dissolved in 500.0 mL of water, how many grams of compound X would be recovered from the water layer after two consecutive extractions using 50.0 mL portions of fresh ether from each extraction
A compound has a distribution coefficient of 11 for a system of ether and water. 5.0 g of this compound is dissolved in 20 mL of water and 20 mL of ether is used to extract it. How much of the compound will you recover in the ether? (in grams)
In this experiment, 0.070 g of caffeine is dissolved in 4.0 mL of water. The caffeine is extracted from the aqueous solution three times with 2.0-mL portions of methylene chloride. Calculate the total amount of caffeine that can be extracted into the three portions of methylene chloride. Caffeine has a distribution coefficient of 4.6, between methylene chloride and water.
Extraction of the aqueous salicylic acid solutions with 10% ethyl acetate/hexane (density ~ 0.7 g/ml) will give two layers in the separatory funnel. a. Will the aqueous layer be the upper layer or the lower layer? b. If dichloromethane (density ~ 1.3 g/ml) were substituted for the 10% ethyl acetate/hexane solution, which layer would be the aqueous layer?
(c) What is the minimum distribution ratio that permits removal of 99% of a solute from 50.0 mL of water with (i) two 20.0-mL extractions with an organic solvent; (ii) four 10.0-mL extractions with the organic solvent?
In a chromatographic analysis, a solution containing 0.0837M toluene and 0.0666M xylene resulted in peak areas of Atoluene= 423 and Axylene= 347. To analyze an unknown sample, 10.0mL of 0.146M xylene was added to 10.0mL of an unknown toluene-containing solution, and the mixture was diluted to 25.0mL. This mixture gave a chromatogram with peak areas of Atoluene= 553 and Axylene= 582. What was the concentration of toluene in the unknown solution?
Why was the tea extract washed with three separate portions of 20 ml of CH2Cl2 instead of 60 ml at once? Use the concept of the distribution coefficient, KD, to support your claim. Assume that the KD for caffeine in a water/dichloromethane system is 7.8
Extraction of the aqueous salicylic acid solutions with 10% ethyl acetate/hexane (density ~ 0.7 g/ml) will give two layers in the separatory funnel. Will the aqueous layer be the upper layer or the lower layer? If dichloromethane (density ~ 1.3 g/ml) were substituted for the 10% ethyl acetate/hexane solution, which layer would be the aqueous layer?
1. Why should the stopper always be removed from a separatory funnel whenever a liquid is being drained through the stopcock?2. The distribution coefficient, KD (ether/water), between ether and water for aspirin at room temperature is 3.5. What weight of aspirin would be extracted by a single extraction with 60 ml of water from a solution of 10 grams of aspirin in 100 ml of ether? Calculate the weight of aspirin which would be removed by three extractions with 20 ml portions of water.
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
When 1.06 mmol of 1-pentanol and 1.53 mmol of 1-hexanol were separated by gas chromatography, they gaverelative peak areas of 922 and 1 570 units, respectively. When 0.57 mmol of pentanol was added to an unknowncontaining hexanol, the relative chromatographic peak areas were 843:816 (pentanol:hexanol). How muchhexanol did the unknown contain?