HardChemistryHigh School (11–12)Organic Chemistry: Some Basic Principles and Techniques › Purification and Analysis of Organic CompoundsNumericalA-LevelIBNEET
Aniline, M = 93 g/mol, is steam distilled…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Aniline, , is steam distilled. The mixture boils when the vapour pressures are about for water and for aniline. Find the mass of aniline that comes over for each gram of water, and the mass of aniline that comes over with of water. Take for water.
Need a reminder? The key ideaShow
Purification: sublimation (a solid that turns to vapour and back), crystallisation (hot saturated solution, then cooling), distillation (simple, fractional, under reduced pressure, steam) and differential extraction. Chromatography separates by different clinging to a stationary phase, and , the distance moved by the substance over the distance moved by the solvent front. In steam distillation, .
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. The ratio. .
Step 2. For of water. .
Answer: of aniline for each gram of water, so with of water. The aniline boils at , yet a good share of it comes over with the steam.
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