Concentration and equilibrium
Concentration and equilibrium

Concentration is the mass of solute present per unit volume of solution. For this topic, it is usually measured in g/dm3\text{g}/\text{dm}^3g/dm3.
Step-by-step lessons covering AQA GCSE Chemistry 6.2.5 The effect of changing concentration (HT only) for Foundation and Higher tier. Each lesson works through exam-style questions in Paper 1 and Paper 2 format. Nail the core quantitative topics — moles, balancing equations and calculations — early on, since they underpin higher-tier questions across every paper and topic.