Chapter 21, Problem 4RAT

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

(a) It includes the concentration of hydronium and hydroxide ions.

(b) It is used because the general public understands it.

(c) It is more accurate to use the pH scale.

(d) It is more convenient, since the concentration of hydronium ions is usually so small.

To determine

The correct option for the statement “Why do we use the pH scale to indicate the acidity of a solution rather than simply stating the concentration of hydronium ions?”

Answer to Problem 4RAT

The correct option for the statement “Why do we use the pH scale to indicate the acidity of a solution rather than simply stating the concentration of hydronium ions?” is option (d).

Explanation of Solution

The acidity of the solution is determined by the concentration of the hydronium ions. The pH scale is used for indicating the acidity of the solution.

The pH is calculated by taking the negative log of the concentration of hydronium ions. The pH scale is generally from $0-14$ .

The concentration of hydronium ions in the solution is very low so, it is not convenient to use it. So, for the convenience, pH scale is used for indicating the acidity of the solution.

Conclusion:

Therefore, the correct option for the statement “Why do we use the pH scale to indicate the acidity of a solution rather than simply stating the concentration of hydronium ions?” is option (d).