# Is there any acid or base which has a pH value under 0 and over 14? [closed]

what is the range of strong acid and base in pH scale.I have much confusion.

• Please be more specific and do some research next time. Apr 26, 2015 at 16:40

Usually the range of a $pH$ scale is $0-14$. A higher number on the $pH$ scale means that the substance is Basic, a lower number means it is Acidic.

Another thought to keep in mind is that there can be a $pH$ less than $0$ and greater than $14$. But let's not get into that right now. The pH scale was made for our convenience and cannot be a totally accurate representation of the real world.

Have you done some research on this? Be more specific in what you do not understand.

Possible duplicates:

The solution with lowest pH value (to the left of pH scale) will be the strongest acid while the solution with highest pH value (to the right of pH scale) will be the strongest base.

In technical words, the acid which dissociates completely into H+ ions in water will have the lowest pH value, while the base dissociates completely into OH- ions in water will have the highest pH value.

EDIT : Strongest acid has pH of 1 while strongest base has pH of 14. (0 - 6.99 are acids. 7 is neutral. 7.1 - 14 are bases.)

I hope that helps.

• It can actually go between -3 and 16. But for most acids and bases you deal with, they will be in the range of 1-14. There are different variables you can adjust, ie temperature, etc, but it's no longer a useful measure.
– user3735
Apr 26, 2015 at 15:51
• @Jun-GooKwak They can go beyond the limits of pH scale? Apr 26, 2015 at 15:52
• @hardik See pubs.acs.org/doi/pdf/10.1021/ed083p1465
– user3735
Apr 26, 2015 at 15:54
• @Jun-GooKwak Wow, thanks for adding that to my knowledge. :) Apr 26, 2015 at 15:55