A-LevelChemistryAnalytical techniquesMay/June 2021Paper 3 Q116 Marks
Iron(II) sulfate crystals, FeSO4•xH2O, contain water of crystallisation. You will carry out a titration to determine the value of x in the formula, where x is an integer. A solution containing a known mass of the crystals will be titrated with acidified aqueous potassium manganate(VII) of known concentration. 5Fe2+(aq) + MnO4¯(aq) + 8H+(aq) → 5Fe3+(aq) + Mn2+(aq) + 4H2O(I) FA 1 contains 26.52 gdm³ of hydrated iron(II) sulfate, FeSO4•xH2O. FA 2 is 0.0200 mol dm-³ potassium manganate(VII), KMnO4. FA 3 is dilute sulfuric acid, H2SO4.
✓ Correct Answer
The correct answer is —. This question tests the candidate's understanding of analytical techniques within the Chemistrysyllabus. The examiner's mark scheme requires...
📋 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...
🔒
Unlock the Examiner's Answer
Sign up for free to reveal the correct answer, the official mark scheme breakdown, and the examiner trap analysis for this question.
Sign Up Free to Unlock →Join thousands of Cambridge students already using Oracle Prep