Back Titration % Purity Q5.5 MADE EASY | IEB May 2021 | Physical Sciences P2 Grade 12

Matric Prelims 2025 - Grade 12 Physical Sciences Paper 2 - This % Purity + Back Titration question WILL come on Monday! In this video I solve May 2021 P2 Q5.5 step-by-step: A 13g impure KOH sample dissolved in 200cm³ of 1.2 mol/dm³ HNO3 (excess). 50cm³ titrated with 23.67cm³ of 0.85 mol/dm³ Na2CO3. We cover: 5.5.1 Amount of nitric acid added (mol) 5.5.2 What is Standard Solution? (Definition) 5.5.3 What is Neutralisation point? (Definition) 5.5.4 PERCENTAGE PURITY of KOH (9 marks) - Full back titration calculation Reaction A: HNO3 + KOH → KNO3 + H2O Reaction B: 2HNO3 + Na2CO3 → 2NaNO3 + CO2 + H2O This is for Grade 12 Physical Sciences, also Grade 11 Stoichiometry revision for November. 🔥 WATCH NEXT: Nov 2024 Q7.3 % Purity: [Link your previous video] Full Stoichiometry Playlist: [Add Playlist Link] 📄 PDF of this question: [Add Drive Link] #physicalsciences #grade12 #prelims2025 #stoichiometry #percentagepurity #backtitration #matrics #nsc #dbe #may2021 TIMESTAMPS: 0:00 Intro - Why this will come on Monday 0:45 Q5.5.1 Moles of HNO3 added 2:10 Q5.5.2 Standard Solution definition 3:00 Q5.5.3 Neutralisation point definition 4:15 Q5.5.4 Percentage Purity - Back Titration Method 12:00 Final Answer & Exam Tips