What is the pH range for acids? For bases?

Aug 14, 2017

Acids: 1-6
Bases: 8-14
Neutral: 7
All values in whole integers, real values may be continuous.

Explanation:

The definition of pH is from the auto-dissociation of water, with an equal number of $O {H}^{-}$ and ${H}^{+}$ ions. This is set to 14, and the definition of pH is $p H = - \log \left[{H}^{+}\right]$ where [H^+] is the molar concentration of the hydrogen ion.

Similarly pOH can be written as $p O H = - \log \left[O {H}^{-}\right]$ .

At equilibrium, [H^+] = [OH^-], and therefore
$p H = p O H = 7$

Any $p H$ less than 7 is an "acidic" solution - containing more
[H^+] than [OH^-].

Any $p H$ more than 7 is a "basic" solution - containing less
[H^+] than [OH^-].