Organic Practical skills
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Write an equation for the oxidation of propane-1,2-diol under reflux, using (o) to represent the oxidising agent Show the displayed formula of the organic product
Check physical flashcards for answers
Anti bumping granules are placed in the flask when refluxing. Suggest why these granules prevent bumping
To form smaller bubbles
State the purpose of anti-bumping granules
To prevent vigorous boiling
Outline the method the student used for recrystallisation
• Dissolve minimum volume of water/solvent • Dissolve in a hot solvent • Filter off the pure product under reduced pressure • Leave to cool to recrystallise
Outline how you would carry out simple laboratory process to show that the recrystallised product is a pure sample of N-phenylethanamide
• Measure the melting point of N-phenylethanamide • Use of melting point apparatus -Sharp boiling point
Assume the reaction goes to completion. Suggest three practical reasons why the percentage yield for this reaction may not be 100%
• Product left in the beaker/ glassware • Sample was still wet • Sample lost during recrystallisation
Explain why the student might prefer to use ethanoic anhydride, even though it has a slower rate of reaction
HCl gas, violent reactio, harmful
You are provided with a small sample of pure aspirin in a melting point tube. Describe briefly how you would determine an accurate value for the melting point of aspirin
• Heat melting point in an oil bath • Slowly near the melting point