Answer: Option (a) is the correct answer.
Explanation:
pH is the measure of concentration of hydrogen ions present in a solution.
Mathematically, pH = -[tex]\frac{1}{[H^{+}]}[/tex]
where [tex][H^{+}][/tex] = concentration of hydrogen ions
More is the concentration of hydrogen ions present in a solution, less will be the value of pH. Hence, more will be the acidic nature of the solution.
Thus, we can conclude that pH is a measure of hydrogen ion concentration.
