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- Two compounds with partition coefficients of 15 and 18 are to be separated on a column with VSVM=0.30VSVM=0.30. Calculate the number of theoretical plates needed to produce a resolution of 1.8. Do not worry about significant figures of your final answer.Iodine is being extracted from 200 mL water using 50 mL CCl4. The partition coefficient for I2 being extracted from water into CCl4 is 85. i. Calculate the extraction efficiency when the CCl4 is used in one portion. ii. Show how the extraction efficiency is improved if the solvent is used in two portions.1. It can be shown mathematically that 2 or more smaller extractions (using smaller portions of asolvent) are better than 1 single extraction using a larger portion of solvent. Suppose a particularextraction proceeds with a partition coefficient, Ksp, of 10. Ksp = C2/C1 where C2/C1 is the distribution of a compound between diethyl ether (C2) andwater (C1) in grams/L. Use grams/L in your calculations. 5.00 g of an organic compound is dissolved in 100 ml of water. Show that two successive 50.0 mlextractions with diethyl ether will yield more compound than one 100 ml extraction.
- Let the retention factor of species A be 0.5, while the retention factor of species B be 0.3. If species A moves 1.0 cm how far does species B move? 0.60 cm 0.80 cm 1.0 cm 1.2 cm 1.6 cmTwo species A and B are known to have water/hexane partition coefficient of 5.99 and 6.16. They are separated by elution on silica gel with hexane as eluent. The ratio for the packing VS/VM =0.425 Two species A and B are known to have water/hexane partition coefficient of 5.99 and 6.16. They are separated by elution on silica gel with hexane as eluent. The ratio for the packing VS/VM =0.425a. Calculate the retention factor for each soluteb. Calculate the selectivity factorc. How many plates are needed to provide a resolution of 1.5?d. What column length should be used to provide a resolution of 1.5 if the plate height ofthe packing is 1.5 ×10-3 cm?e. If the flow rate is 6.75 cm min-1, how long will it take to elute the two species?A 19.8474 gram vial is used to calculate ethe partition coefficient of benzoic acid in a 50/50 DCM/water mixture using 59.9 mg of benzoic acid. If the vial + benzoic acid from the DCM layer weighs 19.8819 grams, what is the partition coefficient (DCM/water)?
- Simple extractions are particularly useful for separations where only one component has a favorable partition coefficient. True or False? True FalseAs part of a lab exercise, your group was assigned an unknown compound X for which you had to determine its partition coefficient between an organic solvent and water. You dissolve and shake 4 grams of X in a mixture of 130 mL benzene and 100 mL of water. At the end, your group discovered that the benzene layer contained 0.5 g of X. Use the information provided to calculate for the partition coefficient. What can you say about the chemical nature of compound X?Acetone has a partition coefficient of 13 while DCM has a partition coefficient of 4.6. Why is DCM used for the extraction of caffeine from Black teabags?
- Naphthalene has a log Kow of 3.33. Estimate its soil-water partition coefficient normalized to organic carbon and the 95 percent confidence interval of your estimate.Mercury is present in Lake Miramar at a total concentration of 20.4 ng/L. Lab tests suggest an average solids partition coefficient of 105L kg-1 What is the dissolved phase concentration if the particle concentration is 25 mg L-1?Chemistry A 50ml aliquot of a 0.1 M solution of a neutral drug was extracted with 2 x 5 ml ethyl acetate. The drug concentration in the combined organic layers was found to be 0.36 M. Calculate the partition coefficient for this drug under these conditions.
