Chapter 21, Problem 3TE

Why do we use the pH scale to indicate the acidity of a solution rather than simply stating the concentration of hydronium ions?

To determine

The reason for using pH scale for indicating acidity of solution instead of concentration of hydronium ions.

Answer to Problem 3TE

The $\text{pH}$ scale is used for indicating acidity of solution instead of concentration of hydronium ions as it is more convenient.

Explanation of Solution

As the hydronium ion concentration is very less in the solution, the more convenient method of signifying acidity is through $\text{pH}$ scale measurements which is negative logarithm of the positively charged hydronium ion. The $\text{pH}$ scale measures the acidity on a scale of $\text{0-14}$ which is a direct measure of determining the acidic solutions. The lower $\text{pH}$ values is exhibited by the solution possessing more acidic nature.

Conclusion:

Therefore, the $\text{pH}$ scale is used for indicating acidity of solution instead of concentration of hydronium ions as it is more convenient.