Final answer:
The hydronium ion concentration in a solution with a pH of 6.0 is 1.0 x 10^-6 M.
Step-by-step explanation:
The hydronium ion concentration of a solution can be determined by its pH using the formula [H3O+] = 10-pH. For a solution with a pH of 6.0, the hydronium ion concentration is calculated as follows: [H3O+] = 10-6. Therefore, the hydronium ion concentration in a solution with a pH of 6.0 is 1.0 x 10-6 M.