Question

An aqueous solution at 25 degrees Celsius contains H = 0.099 M. What is the pH of the solution?

a) pH < 7
b) pH = 7
c) pH > 7
d) Cannot be determined

Answer 1

The pH of a solution with a hydrogen ion concentration of 0.099 M at 25 degrees Celsius can be determined using the formula pH = -log[H+]. The result will be a pH less than 7, meaning the solution is acidic.

Step-by-step explanation:

The question is asking to determine the pH of a solution given the concentration of hydrogen ions (H+) at 25 degrees Celsius. The hydrogen ion concentration is 0.099 M, which is greater than the concentration in pure water at 25 degrees Celsius (1.0 x 10-7 M). To find the pH of the solution, we use the formula:

Plugging in the hydrogen ion concentration:

pH = -log(0.099)

This calculation will result in a pH less than 7, indicating that the solution is acidic. Therefore, the correct answer is a) pH < 7.