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?

2. Look up the solubility data for benzoic acid in the solvent toluene. Is benzoic acid more or less soluble in toluene than water? Why? 3. What would be a disadvantage of using toluene in this experiment? J 2. Look up the solubility data for benzoic acid in the solvent toluene. Is benzoic acid more or less soluble in toluene than water? Why? 3. What would be a disadvantage of using toluene in this experiment?

The liquids to be studied in this experiment are water and aqueous solutions of CTAB. CTAB solutions should be measured at concentrations of 10-5, 10 - 4, 3x 10-4, 8 x10-4, 2 x10-34 x 10-3 M and 10-2 M. Prepare a table with the calculated mass of CTAB required to make up the two most concentrated solutions and a separate table with the mass of concentrated solution required to prepare the dilute solutions. (Assume that you are using, 1000 ml volumetric flasks for the most dilute solutions and 500 ml volumetric flasks for the remainder)

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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.

A student dissolved 20 mg of caffeine in 20 mL of water. The student carried out two extractions using 20 mL of dichloromethane in each one. Caffeine solubility in water: 2.17 g / 100 mL at 25 ° C Caffeine solubility in dichloromethane: 10.0 g / 100 mL at 25 ° C Present the calculations in detail below. A. Determine the distribution coefficient. b. Determine the amount of caffeine obtained in the first extraction. C. Determine the amount of caffeine obtained in the second extraction. 77 D. Determine the total amount of caffeine extracted during the entire process. and E.Determine the percent recovery.

The liquid-liquid extraction technique takes advantage of the solubility difference of a given compound in two immiscible solvents. Group of answer choices True False

What mass of MgCl₂ 6H₂O is required to make a 0.200 dm³ stock solution containing 25.0 ppm Mg(II)? What volumes of this stock solution are required to make 10.0 cm³ standard solutions containing 5.00, 1.00 and 0.10 ppm Mg(II)?

Please answer all 5 questions (it could be short answers). 5-1. What is the main barrier to separating liquid mixtures of less than 500 mL by distillation? 5-2. A sample mixture of ethyl benzoate (bp 212 Celsius) and dodecane (bp 216.2 Celsius) is injected on two GC columns. Column A has DC710 silicone oil as the stationary phase, and column B uses polyethylene glycol as the stationary phase. Which substance would be certain to elute first from column A and would the same material be expected to elute first from column B? Which column, A or B, would be expected to give the better separation of these two substances? 5-3. Question 5-2 refers to separating a mixture of two high boiling liquids by gas chromatography. These materials have similar boiling points. List several GC variables and conditions that would make it easier to separate thesesubstances by gas chromatography 5-4. Capillary GC columns have better resolution than packed columns even though the enormous surface area…

1 a.How could you identify levels in the miscibility tests if you do not know densities of the solvents?  b. What is the main reason for the im/miscibility of the tested solvents?