A compound has a distribution coefficient of 14 between water and diethylether. If 350 mg are present in 100 mL water, how many mL of diethylether is needed to extract 90% of the compound in a single extraction?
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A compound has a distribution coefficient of 14 between water and diethylether. If 350 mg are present in 100 mL water, how many mL of diethylether is needed to extract 90% of the compound in a single extraction?
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- Some procedures include the addition of sodium carbonate before liquid-liquid extraction. What is the purpose of this step?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)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
- Make a results and discussion in Laboratory Report Format of the following: 1. Separation of mixture using different techniques 1.1 Simple distillation: Water + acetone 1.2 Fractional Distillation: Methanol + ethanol 1.3 Chromatography: Separation of mixture of Red ink and blue ink 2. purification of impure samples by crystallization 2.1 Copper sulfate 2.2 Potash alum 2.3 Benzoic acidWhy the Refractive Index of hexane and heptane from simple distillation closer to the refractive index of hexane and heptane from fractional distillation?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.
- What are emulsions? Why do they form during extractions? How is the formation of an emulsion minimized?If you are performing a solvent extraction using 1M HCl (Density slightly > 1.00 g/mL) and diethyl ether (density = .706 g/mL) which layer is the aqueous layer? which is the bottom and top layer?Five grams of Compound A is dissolved in 100 mL of water. The distribution coefficient for Compound A between hexanes and water is 4 KD (hexanes/water) = 4. How much of Compound A will be in the hexanes if you extract it from water once with 90 mL of hexanes? Show all calculations.
- If 80% of a desired compound is extracted into the organic phase in each step (leaving 20% in the aqueous layer), how many extractions are necessary to ensure that at least 99% of the compound has been recovered in the organic phase? 1 extraction 2 extractions 3 extractions 4 extractionsBased on the resulting chromatograms after visualization with iodine vapor, which between the solvent systems WHITE and MIX resulted in a more effective separation of the pigments of the indigo extract? Explain your answer in terms of the solvent that did not effectively separate the components of the root extract.12 g of compound “Y” dissolves in 10 ml of acetone at 25 0C and 0.85 g of the same compound dissolves in 10 ml of boiling acetone. If 5.0 g of compound “Y” were to be recrystallized from 75 ml acetone, what will be the next maximum amount of “Y” that will be recrystallized?