Chapter 19, Problem 101A

Interpretation Introduction

Interpretation : The quantity that corresponds to the y-axis on the graph is to be identified.

Concept Introduction : Acids are substances that contain hydrogen and ionize to produce hydrogen ions $\left({\text{H}}^{\text{+}}\right)$ in an aqueous solution.

Answer to Problem 101A

The quantity that corresponds to the y-axis on the graph is $\left[{\text{H}}^{\text{+}}\right]$ ions.

Explanation of Solution

The given acid is hydrochloric acid.

Hydrochloric acid is a strong acid.

Since it is a strong acid, it dissociates completely in water and produces a number of hydrogen ions.

As the concentration of hydrochloric acid increases, the concentration of hydrogen ions also increases. So, the y-axis on the graph is $\left[{\text{H}}^{\text{+}}\right]$ .