The pH of 10^-8 M HCl solution is:

• A. 8
• B. 1
• C. Close to 7
• D. 0

The pH of a solution indicates its acidity or alkalinity. For hydrochloric acid (HCl), which is a strong acid, we can calculate the pH using the concentration of the solution.

Calculating pH

The formula for pH is:

pH = -log[H⁺]

In this case, the concentration of HCl is 10^-8 M. Since HCl completely dissociates in water, the concentration of hydrogen ions [H⁺] is also 10^-8 M.

Finding the pH Value

Now, we can calculate the pH:

• pH = -log(10^-8)
• pH = 8

However, we must consider that pure water has a pH of 7, and at very low concentrations of strong acids, the pH can be affected by the water's own ionization.

Final Consideration

In this case, since the concentration is very low, the pH will be slightly less than 7 but not as low as 0 or 1. Therefore, the correct answer is:

C. Close to 7