those are the videos that are neccessary to watch https://www.youtube.com/watch?v=oda2K4IFBaE https://www.youtube.com/watch?v=Xkrgw2CFwRs https://www.youtube.com/watch?v=gRZ-2IbLd34 and here

those are the videos that are neccessary to watch

and here is the link to do the experiment

 https://phet.colorado.edu/sims/html/ph-scale-basics/latest/ph-scale-basics_en.html

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