This resource is a set of revision notes on the CCEA GCSE topic of acids, bases and salts. It includes subtopics such as indicators (red litmus, blue litmus and litmus solution); pH scale; strong and weak acids; bases and alkalis; concentrated and dilute solutions; reactions of acids; colours of salts; ammonia; neutralisation and tests for gases. It contains definitions, diagrams and practicals. It is an excellent resource for both students and teachers. It can be used by students in their own private revision. I developed this resource when revising for my own GCSE exams, in which i received grade A star A star in double award science. It can also be used by teachers in the classroom as notes when they go through these topics together with their class.