What is the minimum distribution constant that permits removal of 99% of a solute from 50.0 mL of water with five 10.0-mL extractions with toluene?
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What is the minimum distribution constant that permits removal of 99% of a solute from 50.0 mL of water with five 10.0-mL extractions with toluene?
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- What is the minimum distribution constant that permits removal of 99% of a solute from 50.0 mL of water with two 25.0-mL extractions with toluene? five 10.0-mL extractions with toluene?11. How much caffeine can be extracted using 50.0ml of DCM if a tea bag contains 15 grams of tea leaves with 0.9% of caffeine? And has undergone solid-liquid extraction with 100ml of distilled water followed by liquid-liquid extraction using DCM. The solubility of caffeine requires 15 ml of water and 2.0ml of DCM for 40.0mg. a 6.1 x 10^-5 b 6.0 x 10^-5 c 7.0 x 10^-5 d 7.1 x 10^-5A reagent bottle contains 250 cm3 of 0,4 mol.dm–3 oxalic acid(C2O4H2) solution. Calculate the mass of pure oxalic acid thatmust be dissolved in this solution so that its new concentration is 0,6 mol.dm–3. Assume that the volume of the solution remainsconstant
- 6) A 0.05-mL volume of carbon tetrachloride (CCI) and 0.02 g of p- dichlorobenzene (p-DCB, C6H4Cl₂) are added to a 500-mL separatory funnel containing 300 mL of water and 200 mL of octanol. Calculate the concentrations of both compounds in the octanol and water phases after mixing.A 3mL sample of 2-hexene is mixed with 5.0mL of 0.10 M KMnO4 solution. Predict what the resulting mixture will look like. Explain your prediction.The distribution constant for X between n-hexane and water is 8.9. Calculate the concentration of X remaining in the aqueous phase after 30.0 mL of 0.200 M X is treated by extraction with the following quantities of n-hexane: a. one 40.0-mL portion. Concentration = b. two 20.0-ml portions. Concentration = c. four 10.0-mL portions. Concentration = d. eight 5.00-ml portions. Concentration = M Σ Σ Σ Σ
- In the preparation of 1,200 mL of 70% alcohol from stock absolute alcohol solution, what is the volume of Diluent that must be added to the stock absolute alcohol?A lab technician is asked to prepare 100 ml of 5% working solution from a 25% stock sulfosalicylic acid. Calculate the volume needed. Then the technician is asked to clean out the chemical reagent storeroom and discard any reagents not used in the past 5 years. How should the tech proceed?Emmett, a sophomore chemistry major, was trying to separate an unknown mixture. His instructor told him that there was a carboxylic acid, phenol, and amine present in the mixture. He dissolved 3 g of the unknown in 10 ml of t-butyl methyl ether. He then added 10 ml of 3M sodium hydroxide to the mixture. He used a separatory funnel to separate the layers and collected the aqueous layer in an Erlenmeyer flask labeled fraction 1. Then he added 10 ml of 1.5M sodium bicarbonate to the remaining ether. He separated the layers, and collected the aqueous layer in an Erlenmeyer flask labeled fraction 2. Finally he added 10 ml of 1.5 M hydrochloric acid to the ether, and separated the aqueous later in an Erlenmeyer flask labeled fraction 3. Emmett neutralized the respective fractions. He obtained precipitate in fraction 1, and fraction 3. He ran an IR of the solid obtained in fraction 1 and saw a broad absorption at 3500-3300 cm-1 and a sharp absorption at 1710 cm-1. Fraction 3 showed…
- The density of an aqueous solution increases as solutes such as salts are added. What bearing might this have on predicting whether the aqueous solution will be on the top or on the bottom for an extraction?Consider 15 mL of an aqueous solution containing 2.0 g of an organic solute. If the distribution coefficient for the solute between ether and water is 20, calculate the percent of the compound that can be recovered with a single extraction with 13.3 mL of ether. to two significant figures.Q1. Give three criteria for a good recrystallization solvent. Q2. You want to purify 10 grams of benzoic acid that has been contaminated with 0.2 g of salicylic acid. You are given the following data: Solubility in water at 20 °C Solubility at 100 °C (g/10 ml) Compound (g/10 ml) Benzoic Acid 0.029 0.680 Salicylic Acid 0.680 0.029 0.22 6.67 a) What volume of Boiling water is needed to dissolve the 10 g of benzoic acid? (show calculations) b) How much benzoic acid will crystallize after cooling to 20 °C (show calculations) c) Will any salicylic acid crystals form? Why or why not? (show calculations/ reason for answer) d) What is the maximum amount of benzoic acid that could be recovered in the first crop of this recrystallization? (Show calculations) e) How can you prove the purity and identity of the purified Benzoic acid?