What is pH?
pH is used to measure the strength of an acid or a base.
Mathematically it is negative logarithm of hydrogen ion concentration in the solution.
pH = - log ([H+])
The value of pH can tell whether a solution is an acid or a base or a neutral solution.
Acids have a pH value less than 7.
Bases have a pH value greater than 7.
Neutral solutions have pH = 7.
In general if the pH is decreasing means the solution is becoming more acidic. If the pH of a solution is increasing, it means the solution is becoming more basic.
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