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- 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?Suppose a particular extraction proceeds with a distribution coefficient of 7.5 The mature consists of a certain amount of caffeine dissolved in 100 mL of water. a .How much caffone was originally used when 0.31 g of the organic compound was dissolved in water and 150 = L ether was used as extraction solvent b. How much was dissolved in ether?Make a photocopy of the chromatogram given. Cut out the peaks and weigh them on an analytical balance. Use the weights to calculate the percentage of each component in the mixture.
- Which of the ff is not true about recrystallization? a. acetanalide recrystallized only at cold temp b. congo red stain is removed by using animal charcoal c. acetanalide can be dissolved in hot h20A particular extraction proceeds with a distribution coefficient of 6. The system consists of 3.5 g of compound X dissolved in 60 mL of water (solvent 1). The effectiveness of three 60-mL extractions with n-hexane (solvent 2) is compared with one 180-mL extraction with n-hexane. Questions: 1. How many grams of compound X will be recovered in -hexane in the first extraction? 2. How many grams of compound X will be recovered in water in the first extraction? 3. How many grams of compound X will be recovered in n-hexane in the third extraction? 4. How many grams of compound X will be recovered in water in the third extraction?When you prepare your sample to run through the column chromatography , what is the first proper action you should do if you notice that your sample did not fully dissolve? A)Add a small amount of the sample B)Boil the sample mixture C)Use the rotovap D)Use a different solvent
- Why must the spots be above the level of the development solvent in the developing chamber?Calculate the average and standard deviations for each solution (and solvent).The weight of the purified caffeine is often much lower than the weight of the crude caffeine. Explain why the percent recovery is frequently low.
