what is the range of strong acid and base in pH scale.I have much confusion.
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.
- What is the difference between the titration of a strong acid with a strong base and that of the titration of a weak acid with a strong base?
- Why do strong acids have weak conjugate bases?
- What is a strong base?
Check this out for more information.
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.