A-LevelChemistryEquilibriaOct/Nov 2021Paper 4 Q210 Marks
Ethoxyethane, C₂H₅OC₂H₅, can dissolve both in water and in octan-1-ol. The expression and numerical value for the partition coefficient of ethoxyethane between water and octan-1-ol are given. Water and octan-1-ol are immiscible. Kpc = concentration of C₂H₅OC₂H₅ in octan-1-ol / concentration of C₂H₅OC₂H₅ in water = 6.760 at 20°C
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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