Final answer:
The pH of a solution with a hydronium ion concentration of 5.7×10⁻⁸ M is 7.24 when calculated using the pH formula.
Step-by-step explanation:
To calculate the pH of a solution with a given hydronium ion concentration ([H3O+] = 5.7×10⁻⁸ M), we use the pH formula:
pH = -log[H3O+]
Substituting the given concentration into the formula:
pH = -log(5.7×10⁻⁸)
= -(-7.2441)
= 7.24 (two decimal places, since the mantissa '5.7' has two significant figures)
Therefore, the pH of the solution is 7.24 .