Chapter 22, Problem 2STP

y

To determine

To Choose:The correct option.

Explanation of Solution

Introduction:The lower the value, higher the concentration of ${\text{H}}^{+}$ the solution, that is, more acidic the solution.

The pH of a solution is a measure of the concentration of ${\text{H}}^{+}$ ions in the solution.

If pH of a solution is less than 7, the solution is described as acidic, that is, concentration of ${\text{H}}^{+}$ ions is greater than concentration of ${\text{OH}}^{-}$ ions.

If pH of a solution is equal to 7, the solution is neutral, that is, concentration of ${\text{H}}^{+}$ and ${\text{OH}}^{-}$ is same.

If pH is more than 7, the solution is basic, that is, concentration of ${\text{H}}^{+}$ ions is less than concentration of ${\text{OH}}^{-}$ ions.

Each number on the pH scale represents a change in the ${\text{H}}^{+}$ concentration of ten times.

The lower the value, higher the concentration of ${\text{H}}^{+}$ the solution, that is, more acidic the solution.

The solutions given in the table have pH less than 7 or equal to 7.

According to the pH scale, solution W has a pH equal to 7, and is neutral.

All other solutions X (pH=2), Y (pH=6), Z (pH=4) are acidic.

Thus, solution X has the highest concentration of ${\text{H}}^{+}$ ions compared to the other three solutions, so it contains a strong acid.

Conclusion: Option B. solution Xcontains a strong acid as its pH is equal to 2.