It is easier to write the pH range is from 2 to

So, the pH of a solution is the negative logarithm of the hydrogen ion concentration, pH = -log[H+]

If the hydrogen ion concentration is increased, the pH drops, and the solution becomes more acidic.

If the hydrogen ion concentration is decreased (increasing [OH-] ) the pH rises, and the solution becomes less acidic; in other words, more basic (alkaline). Since the system is based upon powers of 10, a pH of 4 is ten times more acidic than a pH of 5, and a pH of 10 is ten times more basic than a pH of 9.

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