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How many phases did you observe when the naphthalene and p-dichlorobenzene were dissolved? What does this mean?
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- 1. How many phases did you observe when the naphthalene and p-dichlorobenzene were dissolved? What does this mean? 2. What did you observe with the freezing point of naphthalene when you added p-dichlorobenzene?Why is it hard to obtain the melting point of caffeine?Why is it more difficult to recrystallize benzil when using hexane as a solvent instead of ethanol?
- 1. What is the reason behind the portion-by-portion evaporation of DCM in the extraction of eugenol? 2. Enumerate some pharmaceutical and medical uses of eugenol 3. What does the ferric chloride test identify? Is it specific test for eugenol? Why or why not?Why is sodium benzoate soluble in cold water but benzoic acid is insoluble in cold water despite both having an aromatic ring in its structure which is non-polar in nature?Diethylacetal can be detected by gas chromatography. How does this impurity arise in fermentation?
- If 1.0g of hyoscyamine was dissolved in 200mL of water, how much hyoscyamine would be left remaining in the aqueous solution after extracting once with 100mL of diethyl ether? How much hyoscyamine would be left remaining in the aqueous solution if two extractions with 50mL of diethyl ether were performed instead? Which extraction method would be more efficient at removing hyoscyamine from the aqueous solution? The partition coefficient, K, of hyoscyamine in this system is 4.07.Why should you use a minimum amount of water to rinse the conical vial while transferring the purified acetaminophen to the Hirsch funnel?Why does β-naphthol dissolve in a basic medium?
- What is the reason for using as little ethanol as possible to dissolve the crude product (aspirin) before recrystallization?What are emulsions? Why do they form during extractions? How is their formation minimized?How would the results of the TLC experiment, spotting 2-napthol with the unknown solution (most likey 2-napthol) change if instead of sililica gel a TLC plate had C18 wax (basically a 18-carbon alkane) as the stationary phase?