**Solution A: pH 1**

The pH scale is a measure of the acidity or basicity of a solution. It ranges from 0 to 14, with pH 7 being neutral. pH values below 7 indicate acidity, while pH values above 7 indicate basicity.

**Solution B: pH 14**

1. Hydrogen Ion Concentration:
The pH of a solution is determined by the concentration of hydrogen ions (H+) present. The lower the pH value, the higher the concentration of hydrogen ions, and vice versa.

- Solution A has a pH of 1, which indicates a high concentration of hydrogen ions. Thus, solution A has a higher hydrogen ion concentration compared to solution B.
- Solution B has a pH of 14, which indicates a low concentration of hydrogen ions. Therefore, solution B has a lower hydrogen ion concentration compared to solution A.

2. Acidity and Basicity:
The pH scale also indicates whether a solution is acidic or basic.

- Solution A has a pH of 1, which is below 7. Therefore, solution A is acidic.
- Solution B has a pH of 14, which is above 7. Thus, solution B is basic.

**Explanation:**

The pH scale measures the concentration of hydrogen ions in a solution. A lower pH value indicates a higher concentration of hydrogen ions, making the solution more acidic. Conversely, a higher pH value indicates a lower concentration of hydrogen ions, making the solution more basic.

In this case, solution A has a pH of 1, indicating a high concentration of hydrogen ions. This high concentration of hydrogen ions makes solution A highly acidic. On the other hand, solution B has a pH of 14, indicating a low concentration of hydrogen ions. This low concentration of hydrogen ions makes solution B highly basic.

To summarize, solution A has a higher hydrogen ion concentration and is acidic, while solution B has a lower hydrogen ion concentration and is basic.