Extraction is an important technique in organic chemistry, it is used in the \"E
ID: 497455 • Letter: E
Question
Extraction is an important technique in organic chemistry, it is used in the "Extraction of Caffeine from Tea". Please describe how extraction works include the important factors for an extraction solvent Give an example of a drying agent and how it is used. Explain how temperature effects the solubility of solids in liquids. Give examples If 32g of aspirin is recrystallized and 15g of pure aspirin was obtained what was the % recovery? Explain what sublimation is and give an example? If 2.3g of benzoic acid (C_7 H_6 O_2) is retrieved from recrystallization how many moles were retrieved.Explanation / Answer
7) simple distilation - if the solvent has low boiling point,it can remove by simple distilation.solution boiling point must be higher than solvent in this case to remove solvent
by evaporating- in this case can use a water bath and using evaporating dish this can be achive.solvent boiling point have to be below 100 c.
8)Extraction is a process of seperating method. in this case it is a liquid liquid sparetion process.in extraction of caffine we use organic solvent as it is more soluble in organic solvents.in there all caffine extract to the aqueous phase to organic phase.
9)anhydrous CaCl2 . when apply this all water molecules atract to drying agent.
10) when temperature increase solibility of solids increases as temperature decrease solubility decreases.for example solubility of NaCl in water in 2 different temperatures
11) % recovery = 15/32 * 100%
= 46.87%
12)Sublimation is the process of phase transition between solid to gas phase without undergoind liquid phase. example Dry ice
13) molecular weight=122 g/mol
mples=m/M =2.3 /122 =0.0188 mol
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