A-LevelChemistryAnalytical techniquesOct/Nov 2021Paper 3 Q215 Marks
In this experiment you will titrate a solution of the hydroxide of a Group 1 element, Z, with sulfuric acid. The equation for the reaction is shown. Z may or may not be the same as X. 2ZOH(aq) + H2SO4(aq) → Z2SO4(aq) + 2H2O(l) FA 2 is 26.3 gdm-³ aqueous hydroxide of metal Z, ZOH. FA 3 is 0.0500 mol dm-³ sulfuric acid, H2SO4. bromophenol blue indicator
📋 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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