I love teaching about acids and alkalis at KS3 because there’s quite a bit of fun practical work you can do – making an indicator out of red cabbage is an activity that Year 7 always seem to love. The textbook way of starting this topic is to talk about about acids and alkalis around the house… but this might be far more dramatic / interesting way to introduce the subject:

The clip is from Smalltalk Diaries, a series of ten short shows about the lives of minibeasts.