Question

The pH scale runs from a low of what?

Answer 1

The pH scale runs from a low of 0 to 14.

Explanation:

pH zero would be 100% Hydrodium `H_3^+O` ions

The lowest number on the pH scale is the strongest acid.

Answer 2

`pH` doesn't have a "low," however, the minimum value on the scale is 0.

Explanation:

Typically pH falls somewhere between 0 and 14, however pH can be less than 0 or greater than 14. Keep in mind that `pH=-log[H^+]`. If, for example, you have 12M HCl solution, the `[H^+]=12M`, and `pH=-log(12)=-1.08`

Thus, there is no set minimum value of pH. Typically, however, `0≤pH≤14`, so scientists created a scale, and on that scale the minimum value for pH is 0.