Experiment 4B

Variation in volume of extraction solvent: compound X is dissolved in 20.0 mL of solvent B. Assuming a partition coefficient of PX,AB of 5.0, calculate the percentage of X that remains in solvent B if it is extracted the following volumes of solvent A:   1.0 mL 10.0 mL 20.0 mL 100.0 mL

You add 1 mL of sample and collect 1 mL fractions from a column with a volume of 20 mL where the beads take up 60% of the column and the protein of interest has a partition coefficient of 0.4. What fraction do you want to keep?

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6. ( If the solubility of solute Z is 1.0 g/60 mL in diethyl ether and is 1.0 g/1110 mL in water. a) Determine the partition coefficient for the solute Z in these two solvents. b) If 60 mg of the solute Z were dissolved in 100 mL of water, how much ether would be required to extract 90% of solute Z in a single extraction. c) What percent of the A would be extracted from the aqueous solution in (b) by two 50 mL portions of ether?

Partition coefficients (Kow = organic solvent concentration/aqueous concentration, usually reported as log Kow) are important for determining how efficiently organic compounds can be extracted from aqueous solutions. For example, consider the two substances below. Which will be more soluble in water? Hexamethylbenzene (log Kow = 6.41) O Diethyl ether (log Kow = 0.83)

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The partition coefficient for caffeine between dichloromethane and water is 4.6.  Assume that a 100 mL tea solution (in water) contained 100 mg of caffeine.  What is the theoretical yield of caffeine in the methylene chloride if you extract with one 100 mL portion of methylene chloride?

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700 mg of Antimony (Sb) was dissolved in 100 mL of HCl, an equal volume of isopropyl ether was added, and the system thoroughly shaken. The layers were separated; and the ether, evaporated. The residue was found to contain 685 mg of Antimony.  What is the distribution ratio? What is the partition coefficient?

c) diethyl ether. After separating the layers, 240 mg of cyclohexanol are recovered from the diethyl ether layer. You approximate that the remaining 10 mg of cyclohexanol must have been dissolved in the aqueous layer. Calculate the partition coefficient. Show work. 250 mg of 1-phenylcyclohexanol are dissolved in a combination of 10 mL of water and 20 mL of

The partition coefficient, Kp, at 25°C (i.e., room temperature) for compound A is 9.71 (for water and benzene). Starting with a solution of 16.6 g of compound A in 110 mL of water, what is the total percent of compound A that is extracted into the benzene after two successive extractions of 65.0 mL benzene each? [Enter a value with 3 sig figs and do not include the % sign]

A solution of 3g organic compound X in 200ml of water was extracted with 200 ml of ethyl ether. At equilibrium the concentration of Xin the two phases was ; 2.6g/100ml of ethyl ether ; 0.8g/100 ml of water. Calculate the partition coefficient, Kd, for compound X in the system. Show your calculations and What percentage of the original sample of X was extracted? Show your calculations.

2) Assume you are decaffeinating your coffee by extracting the caffeine out with dichloromethane. Your particular brand of coffee contains 100 mg of caffeine in a 200 mL cup of water. The partition coefficient of caffeine in dichloromethane/water is 8.0 (it is more soluble in the dichloromethane).Answer the following questions about how much caffeine would still be in the 200 mL of water based on two different approaches. You should solve this algebraically. If you use an equation found on the internet, you will need to show how it was derived to receive credit.a) How much caffeine would remain in the water after extracting once with 200 mL of dichloromethane? Show your work.b) How much caffeine would remain in the water after extracting twice, each time with 100 mL of dichloromethane? Show your work.

What is the molar extinction coefficient (e) for o-nitrophenol at lmax?  Explain how you arrived at this value.

how can i calculate part a

If the partition coefficient of CBN from water into ethanol is 4, what fraction q of the CBN would remain in a 424 mL aqueous sample if it was extracted with 69 mL of ethanol twice?

Please don't provide handwriting solution

Why does phenol red have 2 molar extinction coefficient values? The significance of having 2 lambda-max (λmax)? What is the purpose of generating a standard curve? What is the slope of this standard curve?

One gram of a compound requires the following quantities of solvent to dissolve: 47 ml of water, 8.1 ml of chloroform, 370 ml of diethyl ether, or 86 ml of benzene. A. Calculate the solubility of the compound in these four solvents (as g/100 mL). Estimate the partition coefficient of the compound between chloroform and water, ethyl ether and water, and benzene and water. B. Which solvent would you choose to extract the compound from an aqueous solution?

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?

You want to decaffeinate your coffee by extracting the caffeine out with dichloromethane (they don't do it that way anymore, but they used to).  It's too late to extract the caffeine from the coffee beans, because you've already brewed yourself a 200 mL cup of coffee.  Your particular brand of coffee contains 100 mg of caffeine in that 200 mL cup.  The partition coefficient of caffeine in dichloromethane/water is 9.0 (it is more soluble in the dichloromethane). one extraction using 200 mL of dichloromethane; or two extractions using 100 mL of dichloromethane each.  Show your work for both parts a) and b).

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.

hi, expert please help me with this problem.. i need it before 5 pm thank you As 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?  I HAVE 2 ANSWERS  (i don't know if it is correct hehehe) 1st Answer: partition coefficient (Kd)=conc. at 1st phase (C1) / conc. at 2nd phase (C2) Kd = C1/C2 = CH2O / CBenzene Kd = (4g-0.5g) / 100 mL / 0.5G/130 mL Kd = 0.035/0.003846154 Kd = 9.099 or 9.1   (my 1st answer) My 2nd Answer is on the picture please CHECK IF CORRECT. IF NOT PLEASE SEND THE CORRECT ANSWER THANK YOU.

1. Calculate the capacity factor, k' for methyl paraben and propyl paraben.  2. Calculate the selectivity factor, a for the two-component mixture.

please quickly  ,within 1hour thanks ! If it takes longer than an hour, i don't need the answer (3) What are the qualitative and quantitative principles of inductively coupled plasma spectroscopy?