Acids, Bases and Kw | A level Chemistry Exam Question Walkthrough

This video is a full AS & A‑Level Chemistry exam‑question walkthrough on Kw, the ionic product of water, pure water equilibria, and calculating the pH of an acid–base mixture. I take you through the reasoning, the equations, and the logic examiners expect. You can also download the full exam question using the link below. https://drive.google.com/file/d/1EVdE_22fJzh710ofFoDCpCkDyJLTlHTm/view?usp=sharing Links directory for all YouTube videos: https://drive.google.com/file/d/1s3I5prjbJRR1U1lcKpXO9TQpQMaVoP66/view?usp=drive_link This walkthrough shows the exam‑marking points in purple, and the thinking‑out‑loud development and annotations in red/purple, so you can clearly see what earns marks and what helps you understand the logic behind the chemistry. What this walkthrough covers (no spoilers) Writing and using the Kw expression Understanding pure water and its equilibrium Linking [H⁺] and [OH⁻] using Kw Acid + base reacting together Calculating the resulting pH of a mixture Clear, examiner‑friendly steps Perfect for A‑Level Chemistry, including AQA Paper 1, OCR A, OCR B (Salters), and anyone revising acid–base equilibria. Timestamps 00:00 Intro 00:05 Walkthrough structure 00:49 Kw, pure water and the Kw expression 04:08 Acid + base mixture and resulting pH