Final answer:
To determine the pH level of an acetic acid solution with a hydronium ion concentration of 2.15 × 10^-3 M, use the formula pH = -log[H3O+], resulting in a pH of approximately 2.67.
Step-by-step explanation:
The student has asked to calculate the pH for an aqueous solution of acetic acid that contains 2.15 × 10-3 M hydronium ion. To find the pH, we can use the formula pH = -log[H3O+]. Upon substituting the given hydronium ion concentration into this formula, the pH is calculated as follows:
pH = -log(2.15 × 10-3)
Therefore, the pH of the solution is:
pH = -log(2.15 × 10-3) ≈ 2.67.