ABSTRACT
Bath bombs are toiletries that usually fizz when added to water and also release colour, fragrance and/or oil into the water. They work due to the reaction between acids and alkalis. In this investigation the acid is citric acid and the alkali is bicarbonate of soda. This chapter describes the procedure for making a fizzing bath bomb using bicarbonate of soda and citric acid. This real-world science experiment is structured as a problem-solving activity thus helping KS3 science teachers to engage students effectively in the secondary school classroom. First, background science knowledge for this experiment is provided, along with the learning objectives, list of materials needed for the experiment, safety and technical notes, and a list of engaging activities to be performed by students. Data collection ideas are subsequently provided, together with useful questions to ask the students and also suggestions for homework.
