A student was asked to estimate the concentration of glucose in a solution using the Benedict's test. The student was provided with a 1.0 mol dm⁻³ glucose solution and was told to make a 0.6 mol dm⁻³ solution by proportional dilution. Which row shows the correct volumes of both 1.0 mol dm⁻³ glucose solution and distilled water needed to make the 0.6 mol dm⁻³ solution?
✓ Correct Answer
The correct answer is A: volume of 1.0 mol dm⁻³ glucose solution/cm³ 12, volume of distilled water/cm³ 8
📋 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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