I know of the 1 – 10 scale and pure water is a ‘neutral 7’ or something but what decides the number? What’s main difference between a substance at 1 and another at 10 on the scale?
In: 6
The pH scale goes from 0-14, so 7 is right in the middle being neutral makes sense. It describes the concentration of H+ and OH- ions logarithmically, 7 means the concentration of H+ is 10^-7 mol/L , 6=10^-6, 5=10^-5, and so on – for OH- ion concentration it is the reverse 7 is the same but the concentration changes in the opposite direction pH=8 means it is 10^-6, 9=10^-5 and so on. So the lower the pH the more acidic it is / the higher the pH the more basic it is.
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