8. Ethanol is miscible with water. (After all, alcoholic beverages don t separate into an “alcohol‟ layer” and a “water layer.”) Assuming that caffeine is soluble in ethanol, could you use ethanol as a solvent to extract caffeine from coffee (rather than using dichloromethane as the extraction solvent)? Explain why or why not.

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Extraction of Caffeine Post-lab 1. What group of organic compounds does caffeine belong to? 2. Draw the structure of caffeine as a line formula. Redraw the structure of caffeine,showing all carbon and hydrogen atoms. 3. What is the molecular formula for caffeine? Use the molecular formula of caffeine tocalculate its molecular weight. 4. What does it mean for two solvents to be immiscible? 5. On the report sheet, you calculated your percent recovery of caffeine. a. If your percent was less than 90%, give at least one reason why it was less. b. A group of students have their percent yield more than 100%, give at least one reasonwhy it was more than 100%. Do NOT simply say “human error.” Be specific about the typesof errors (human or otherwise) that may have occurred, leading to a recovery more than eorequal to 100% (Is this possible Why?)   6. Based on what you observed during this experiment, is dichloromethane denser OR lessdense than water? Explain your reasoning. 7. Based on what…

Based on the melting point of your impure solid, you look at the given samples and believe you havecompound A. Compound A is recrystallized using a mixed solvent system of ethanol and water. You add1 ml of hot ethanol to your sample and it doesn’t completely dissolve. You continue to add hot ethanolbut there isn’t any change. Some solid remains. What should you do next?

7- Place the stopper on the volumetric flask and mix the solution thoroughly by inverting and shaking the flask. Don't add water to a level above the line on the neck of the flask. beaker balance $4.68 stirrer bar 6 volumetric flask C D Conclusion: state the concentration of your solution. E E Analysis: a. Calculate the concentration of your solution. b. Why was it necessary to invert the volumetric flask? c. Why should the final solution be left stopper? d. If we filled the flask to above the line how would this have changed the concentration of the solution?