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- 1) outline the process you would adopt to purity and test the purity of sodium benzoate, an active ingredient of most cosmetic products in the laboratory.A 300-mL aqueous solution containing a 30.0g of compound A is to be extracted with ether. The solubility of compound A in ether at room temperature is 20.0g/mL and in water is 8.00g/mL. Calculate the weight of the compound that would be recovered by extraction with (a) two 150-ml portions of ether (b) one 300-mL portion ether. Which portion gives a higher recovery for compound A?1) Outline the processes you would adopt to purity and test the purity of sodium benzoate, an active ingredient of most cosmetic products in the laboratory.
- You have a sample of 90 mL cola drink that contains 50 mg of dissolved caffeine. Calculate the total mass of caffeine extracted using 54 mL of dichloromethane in each of the following procedures: the entire volume of dichloromethane is used in one step; the dichloromethane is divided into two (27 mL) portions in a two-step extraction and into three (18 mL) portions in a three-step extraction. Please use two decimal places. Number of extraction steps One Step Two Steps Three Steps Extracted caffeine mass (mg) (Submit)A sample contains a mixture of t-butanol and n-butanol. What type of distillation, simple or fractional, would be best employed to separate the two liquids? Why?1. A vial containing an unknown sample is suspected to be one of the following compounds (mp.): urea (~133 °C), 2,4-dimethylacetanilide (~133 °C), phenacetin (~134°C) or 3-chlorobenzamide (~134 °C). A list of melting points taken on a machine when the 50% of the unknown by volume has been mixed with 50% each of the possibilities is shown in the following table: Melting point (°C) of mixture Substance mixed with unknown (50% each) urea 133.5-134.0 2,4-dimethylacetanilide phenacetin 3-chlorobenzamide 108.6-128.1 105.7-120.4 120.3-130.5 Identify the unknown and explain your reasoning, using the notes you have taken in the lab.
- If the solubility of a compound A in ether is 30g/100 ml, and the solubility of A in water is 15 g /100 ml. a) If 100 ml of aqueous solution of 3g of A are extracted twice with 100 ml ether. How much A total is extracted? b) How much A would be extracted if only one extraction, but with a volume of 200 ml of ether were extracted? c) What is your conclusion from the amount of A extracted in problems a and b above?In caffeine recrystallization, explain how recrystallization was performed and how pure caffeine was obtained.. One gram of caffeine dissolves in 55 mL of water, 7 mL of Dichloromethane, 530 mL of diethyl ether, and 100 mL of benzene. Which is the optimal solvent to extract caffeine from an aqueous solution? Why?