The pH Scale According to Gordon and Simon
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Acid and alkali react together and make… a foaming mess.
A film explaining the pH scale and a neutralisation experiment. It was written by two third year pupils aged 13-14.
There’s a glorious moment in this film, right at the end, where the performers realise what an awful mess they’ve made. I do hope they cleared up. If not… well, try denying you were the cause of the foaming puddle once your teacher’s seen this evidence, hmm?