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a. Assume a certain extraction has a distribution co-effecient of 7.5. The combination is made up of a certain quantity of caffeine dissolved in 100 ml of water. b. Re-crystallization was used to purify a 25 g organic compound. The amount recovered upon re-crystallization was 8 g. (Write the balancing equations for C,H, and O.:)
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- Sketch a flow injection apparatus for the determination of sodium sulfite in aqueous samples.Why is water not a good recrystallization solvent for sodium benzoate? a. Sodium benzoate is soluble in cold water. b. Sodium benzoate is soluble in hot water.One of the components of nutmeg is an organic compound, Trimiristin, A. To extract this compound from nutmeg why we need to choose as a solvent, ether, and not acetone?B. Is it possible to choose water as an exhaustive solvent of Trimiristin?
- Let's assume that 5.6 g of crude product was isolated, and 4.19 g of pure product was collected after recrystilization 8. Let's assume that the melting point of the recrystallized product was 104-108°C. What conclusions can you draw? Provide a brief discussion of these results.(c) What is the minimum distribution ratio that permits removal of 99% of a solute from 50.0 mL of water with (i) two 20.0-mL extractions with an organic solvent; (ii) four 10.0-mL extractions with the organic solvent?Which statement about liquid-liquid extraction is not correct? * A- A solvent must be available that is miscible with the solution containing the substance to be extracted. B- The solvent used for extraction must have a good ability to dissolve the desired substance. C- The denser solution forms the bottom layer in the extraction funnel. D- The extraction funnel must be vented during the extraction procedure to prevent excessive build-up of pressure inside the extraction funnel. E- All these statements are correct.
- PLEASE USE ANOTHER SOLUTION. WRITE ALL THE PROCESS. 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?Fill in the blanks: a) The component of the mixture that becomes a water soluble salt by treating the two component mixture with sodium hydroxide solution has the highest _______________. b) The lower phase in equipment used for liquid-liquid extraction in a water-dichloromethane mixture is_____________, because _______________. c) The component of the mixture that becomes a water-soluble salt is the one with the greatest ______________Volumetric Analysis The mass of KHC8H4O4 is measured to the nearest milligram; however, the volume of water in which it is dissolved is never of concern—water is even added to the wall of the Erlenmeyer flask during the titration. Explain why water added to the KHC8H4O4 has no effect on the data, whereas water added to the NaOH solution, may drastically affect the data.
- a) When considering the overall dialysis procedure, why is it important to exchange old/used dialysis buffer (or “dialysate” solution) with a fresh dialysis buffer solution at least once throughout the process? NOTE: Your TAs will do this for your group’s samples over the next week. b) This week’s lab utilizes a dialysis buffer with the following composition: 10 mM Tris-HCl, 10 mM MgSO4, and a pH of 7.4. Let’s presume an ERROR occurred with the creation of this buffer during the pH titration and you unknowingly titrated to a final pH of 5.0. What effects, if any, could you expect to observe on your final, dialyzed sample?How was the precipitate obtained after filtration? a. By drying the precipitate on the filter paper using a desiccator. b. By charring the filter paper and igniting the product in a crucible. c. By redissolving in hydrochloric acidneed this answer in detail. don't copy elsewhere I will downvote . A separation of the mixture of substances X and Y is carried out by extraction of Craig using an organic solvent of the same volume. What is the dissolved Y fraction in the 18th tube after 24 times of removal if Dy = 5 is known