exam specific answers (required practicals)
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suggest how the purity of the ester can be confirmed during the distillation. (1)
compare boiling point to data book value
describe the recrystallisation process used to purify the aspirin - include the method and apparatus used. (6)
• dissolve crude product in hot solvent • of minimum volume • hot filter to remove insoluble impurities • cool to recrystallise • filter under reduced pressure with Buchner apparatus • wash with cold solvent and dry
Describe the apparatus used to remove the drying agent by filtration under reduced pressure. (2)
• Buchner funnel with filter paper • Buchner flask connected to vacuum pump
give a reason why two layers form in the separating funnel. (1)
ethyl ethanoate insoluble in water
The distillate was shaken with saturated sodium chloride solution. The cyclohexene was separated from the aqueous solution using a separating funnel. State why cyclohexene can be separated from the aqueous solution using the separating funnel. (1)
the liquids are immiscible