Question

what is pH and what is pH scale define that's it

Answer 1

pH of a solution tells us about the nature of solution ie. acidic or basic.
pH scale tells us about the concentration of OH neg. and H positive ions

Answer 2

pH is the power of Hydrogen dissociate in aqueous solution of any acid.
It tells us how strong an acid or base is.

For ex:-
If pH is 1, then the substance is a strong acid.
If pH is 5, then the substance is a weak acid.
If pH is 7, then the substance is a neutral.
If pH is 9, then the substance is a weak base.
If pH is 14, then the substance is a strong base.



Its range is 1-14.




Hope this will help you. 

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