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What is pH?
pH is a measure of the hydrogen (H+) ion concentration of a solution
Solutions with a high concentration of hydrogen ions have a low pH
Solutions with a low concentration of hydrogen ions have a high pH
The pH scales has a range from 0-14
7 is neutral
>7 is acid
<7 is basic
pH scale is logarithmic which means a whole pH below 7 is ten times acidic then the next highest value.
E.g. pH 2 is 10 times more acidic than pH 3 and 100 times more acidic than pH 4
It also applies for pH levels over 7 but instead of acid its basic/alkaline.
Formula = pH = -log[H+]