Calculate the (H+), and indicate whether it is an acid, base, or neutral for a
solution with a concentration of [OH-] = 8.8 x 10^-9 M.*

As the pH value is less than 7, (in this case 5,94) it corresponds to an acidic substance.

Explanation:

The pH indicates the acidity or basicity of a substance. pH values between 0 and less than 7 indicate acidic solutions, 7 neutral and higher than 7 to 14 basic. It is calculated as: pH = -log (H 30+)

First we calculate the concentration of H 30+:

Both pH and pOH have a relationship to belonging to the same aqueous solution: the expression of the Kwater (ionic product of the water Kw) is used:

(H3O  +) x (OH  -) = 1x10 ^ -14

(H3O  +) x (8.8 x 10^-9)= 1x10 ^ -14

(H30+)= 1x10 ^ -14/(8.8 x 10^-9)

(H30+)= 1,14 x 10^-6 M

pH= -log (H30+)

pH= -log (1,14 x 10^-6)

pH=5,94  As the pH value is less than 7, it corresponds to an acidic substance.

it is the most commonly accepted one