Answer:
A solution with a pH of 5.0 is considered acidic, and the pH scale is a measure of the concentration of hydrogen ions (H+) in a solution. To find the hydronium ion concentration ([H3O+]) in the solution, we can use the equation:
pH = -log[H3O+]
Rearranging the equation to solve for [H3O+], we get:
[H3O+] = 10^(-pH)
Substituting the pH value of 5.0 into the equation, we get:
[H3O+] = 10^(-5.0)
[H3O+] = 1.0 x 10^(-5) M (or mol/L)
Therefore, the hydronium ion concentration in the solution is 1.0 x 10^(-5) M.